WO2011056291A1 - Use of succinate dehydrogenase inhibitors for extending shelf life of fruits and vegetables - Google Patents

Abstract

The present invention relates to the use of succinate dehydrogenase Inhibitors for extending shelf life and storage stability of fruits and vegetables, to a method for extending shelf life of fruits and vegetables by applying a succinate dehydrogenase inhibitor to the crops prior to the harvest of the fruits or vegetables and to a fruit or vegetable treated with a succinate dehydrogenase Inhibitor.

Description

Use of Succinate Dehydrogenase Inhibitors for Extending Shelf Life of Fruits and Vegetables

The present invention relates to the use of succinate dehydrogenase Inhibitors for extending shelf life and storage stability of fruits and vegetables and to a method for extending shelf life of fruits and vegetables by applying a succinate dehydrogenase inhibitor to the crops prior to the harvest of the fruits or vegetables.

Fresh fruits and vegetables are extremely perishable commodities. Heretofore many techniques have been employed to protect such food products from oxidative degradation, mold attack and moisture penetration and to preserve the freshness, texture and color of the fresh produce.

One of the earliest means of lengthening the shelf life of fruits and vegetables was refrigeration. However, most fresh produce when stored under reduced temperatures for prolonged periods shows adverse effects on the taste, odor or quality of the product from microbial and mold growth above 1,7 °C. In addition, storage temperatures below 1,7 °C often show chill injury to the tissue of the produce. Hence, in many instances refrigeration alone is not effective in achieving the desired shelf life for a particular fruit or vegetable. Coating fresh fruits and/or vegetables is another of these techniques which has been employed with varying degrees of success. Not only must the coating be effective in prolonging the useful shelf life of the fresh product, but the appearance of the commodity must not be altered from that of its natural state. At a minimum, this natural appearance must not only remain unchanged but should ideally be enhanced especially when the fruit or vegetable will be displayed for sale. The selection of a coating material is further complicated where the fruit or vegetable is to be consumed in its natural state and it is considered essential that there be no need to remove the coating. In that event, the coating material must not only be edible, it must not affect or alter the natural organoleptic characteristics of the fresh fruit or vegetable.

Typical of these prior art coatings are the wax emulsions of U.S. Pat. Nos. 2,560,820 of Recker and 2,703,760 of Cunning. Coatings of natural materials have been employed including milk whey (U.S. Pat. No. 2,282,801 of Musher), lecithin (U.S. Pat. Nos. 2,470,281 of Allingham and 3,451,826 of Mulder), gelatin together with polyhydric alcohol (U.S. Pat. No. 3,556,814 of Whitman et al.) and protein (U.S. Pat. No. 4,344,971 of Garbutt). Polymers have also been used extensively, viz., a thermoplastic polymer (U.S. Pat. No. 2,213,557 of Tisdale et al.), vinyl acetate polymer (U.S. Pat. No. 3,410,696 of Rosenfield), a hydrophilic polymer (U.S. Pat. No. 3,669,691 of De Long et al.) and the combination of a water soluble polymer and a hydrophobic material (U.S. Pat. No. 3,997,674 of Ukai et al.). Cellulostic materials have found utility in coating fruits and vegetables including hydrated cellulose (U.S. Pat. No. 1,774,866 of Beadle), a combination of cellulose and wax (U.S. Pat. No. 2,364,614 of Beatty), cellulose ether in combination with a fatty acid ester (U.S. Pat. No. 3,471 ,303 of Hamdy et al.) or monoglyceride and a fatty acid metal salt (U.S. Pat. No. 3,461,304 of Hamdy et al.), or a sucrose ester of a fatty acid (U.S. Pat. No. 4,338,342 of Tan et al.)

Food preservation has for many years employed such mutually exclusive processes as dehydration and freezing. Both of these operations often include a heat treatment, known as blanching, which is conducted prior to the dehydration or freezing step. Blanching is said to reduce enzyme or bacteria level and to prevent or minimize undesirable changes during storage in the dry or frozen state, such as changes in color, odor or texture or loss of vitamins. Blanching may be conducted with steam (e.g., U.S. Pat. No. 2,373,521 of Wigelsworth), hot water (U.S. Pat. No. 2,515,025 of Vahl et al.), hot oxygen-free gas (U.S. Pat. No. 3,801,715 of Smith et al.) or hot air (U.S. Pat. No. 3,973,047 of Linaberry et al.)

Therefore, there is a strong need for methods for improving shelf life of fruits and vegetables which avoid the drawbacks resulting from the prior art methods.

The problem outlined above has been solved by the use of succinate dehydrogenase inhibitors for extending shelf life of fruits and vegetables.

It has surprisingly been found that the application of succinate dehydrogenase inhibitors during the growing and maturation periods avoids development of bacterial or fungal diseases during the storage period. This effect was especially notable with the reduction of one of the major fungus causing post harvest problems, i.e. Rhizopus spp. Consequently, shelf life and storage stability of the treated fruits and vegetables is significantly extended.

Brief Description of the Figures

Figure 1: Photo of a harvest date box for treatment number 3 (FLU+TFS). Figure 2: Photo of a harvest date box for treatment number 4 (Elevate).

The "blank spots" and wet paper were due to the removal of berries that had melted following a Rhizopus infection (to prevent a second cycle of infection that would overwhelm the berries in the box). The dark grey fungus developed to cover the berries within a 24-hour period in the box.

Detailed Description of the Invention

In conjunction with the present invention all active substances (a.s.) which inhibit succinate dehydrogenase in the mitochondrial respiration chain can be used. In a preferred embodiment of the present invention the succinate dehydrogenase inhibitor is selected from the group consisting of fluopyram, isopyrazam, boscalid, penthiopyrad, N-[2-(l,3-dimethylbutyl)phenyl]-5-fluoro-l,3- dimethyl-lH-pyrazole-4-carbox-iamide, sedaxan and bixafen or mixtures thereof. In a most preferred embodiment of the present invention the succinate dehydrogenase inhibitor is fluopyram.

Fluopyram having the chemical name N-{ [3-chloro-5-(trifluoromethyl)-2-pyridinyl]ethyl}- 2,6-dichlorobenzamide is a fungicide belonging to the chemical class of pyridylethylbenzamides. Fluopyram and its manufacturing process starting from known and commercially available compounds is described in EP-A- 1 389 614.

N-[2-(1 -dimethylbutyl)phenyl]-5-fluoro-13-dimethyl-lH-pyrazole-4-carboxarnide and its manufacturing process starting from known and commercially available compounds is described in WO 03/010149.

Bixafen having the chemical name N-(3',4'-dichloro-5-fluoro-l,r-biphenyl-2-yl)-3-(difluoromethyl)- 1 -methyl- lH-pyrazole-4-carboxamide (Compound 1-2) and its manufacturing process starting from known and commercially available compounds is described in WO 03/070705.

Sedaxane is the mixture of 2 cis-isomers 2'-[(lRS,2RS)-l,l '-bicycloprop-2-yl]-3-(difluoromethyl)-l- methylpyrazole-4-carboxanilide and 2 trans-isomers 2'-[(lRS,2SR)-l,l '-bicycloprop-2-yl]-3- (difluoromethyl)- l-methylpyrazole-4-carboxanilide. Sedaxane and its manufacturing process starting from known and commercially available compounds is described in WO 03/074491, WO 2006/015865 and WO 2006/015866.

Isopyrazam is the mixture of 2 syn-isomers 3-(difluoromethyl)-l-methyl-N- [(IRS, 4SR,9RS)- 1,2,3,4- tetrahydro-9-isopropyl-l,4-methanonaphthalen-5-yl]pyrazole-4-carboxamide and 2 anti-isomers 3- (difluoromethyl)- l-methyl-N-[(lRS,4SR,9SR)-l ,2,3,4-tetrahydro-9-isopropyl-l,4-methano- naphthalen-5-yl]pyrazole-4-carboxamide. Isopyrazam and its manufacturing process starting from known and commercially available compounds is described in WO 2004/035589.

Penthiopyrad having the chemical name (RS)-N-[2-(l,3-dimethylbutyl)-3-thienyl]-l-methyl-3- (trifluoromethyl)pyrazole-4-carboxamide and its manufacturing process starting from known and commercially available compounds is described in EP-A-0 737 682.

Boscalid having the chemical name 2-chloro-N-(4'-chlorobiphenyl-2-yl)nicotinamide and its manufacturing process starting from known and commercially available compounds is described in DE-A 195 31 813. In conjunction with the present invention shelf life (or storability) denotes the period of time during which the perishable fruit or vegetable can be stored refrigerated or un-refrigerated, and remain edible and free from noticeable or harmful degradation or contamination by microorganisms or fungi.

Extension of shelf life denotes an elongation of shelf life of at least several days, preferably of at least one week, most preferably of at least one month. The use/method according to the present invention can be applied to any kind of fruits and vegetables.

Examples for fruits are banana, blackcurrant, redcurrant, gooseberry, tomato, eggplant, guava, lucuma, chili pepper, pomegranate, kiwifruit, grape, table grapes, pumpkin, gourd, cucumber, melon, orange, lemon, lime, grapefruit, banana, cranberry, blueberry, blackberry, raspberry, boysenberry, hedge apple, pineapple, fig, mulberry, apple, apricot, peach, cherry, green bean, sunflower seed, strawberry and plum.

Examples for vegetables are flower buds, such as: broccoli, cauliflower, globe artichokes; seeds, such as sweetcorn also known as maize; leaves, such as kale, collard greens, spinach, beet greens, turnip greens, endive; leaf sheaths, such as leeks; buds, such as Brussels sprouts; stems of leaves, such as celery, rhubarb; stem of a plant when it is still a young shoot, such as asparagus, ginger; underground stem of a plant, also known as a tuber, such as potatoes, Jerusalem artichokes, sweet potato, yam; whole immature plants, such as bean sprouts; Roots, such as carrots, parsnips, beets, radishes, turnips; bulbs, such as onions, garlic, shallots.

In a preferred embodiment strawberries or table grapes are treated with succinate dehydrogenase inhibitors, most preferably with fluopyram in order to improve the shelf live of the harvested fruits. The succinate dehydrogenase inhibitors, preferably fluopyram, can be employed for extending shelf life of fruits and vegetables within a certain period of time after the treatment of the crops bearing the fruits or vegetables or after treating the fruits or vegetables itself. Generally, the succinate dehydrogenase inhibitor is applied to the crop or to its fruits or vegetables prior to the harvest, more preferably prior to the maturation of fruits and vegetables, most preferably during the plant and fruit growth prior to contamination event. The period of time within which protection is effected generally extends from 1 hour to 6 months, preferably from 1 week to 1 month after the treatment of the crops or its fruits or vegetables with the active compounds.

When employing the succinate dehydrogenase inhibitors, preferably fluopyram, according to the present invention for extending the self life of the harvested fruits or vegetables, the application rates can be varied within a broad range, depending on the type of application. For foliar applications the application rates of active compound are generally ranging from 1 to 250 g ha, more preferably from 25 to 200 g/ha, most preferably from 30 to 150 g/ha based upon the pure a.s. (active substance).

According to the present invention the succinate dehydrogenase inhibitor, preferably fluopyram, can be applied to all parts of the plants such as shoot, leaf, flower and root, leaves, needles, stalks, stems, flowers, vegetative buds and flower buds fruiting bodies and fruits.

Plants are understood as meaning, in the present context, all plants and plant populations, such as desired and undesired wild plants or crop plants (including naturally occurring crop plants). Crop plants or crops may be plants which can be obtained by conventional breeding and optimization methods or else by biotechnological and genetic engineering methods or by combinations of these methods, including the transgenic plants and including the plant varieties capable or not capable of being protected by plant breeders' rights.

According to the invention the treatment of the plants with the succinate dehydrogenase inhibitors, preferably fluopyram, is carried out directly by the customary treatment methods, for example by immersion, spraying, vaporizing, fogging, injecting, dripping, drenching, broadcasting or painting. In a preferred embodiment of the invention fluopyram is applied by injecting, dripping, drenching or spraying.

The succinate dehydrogenase inhibitors, preferably fluopyram, can be converted to the customary formulations, such as solutions, emulsions, suspensions, powders, foams, pastes, granules, aerosols, very fine capsules in polymeric substances and in coating compositions for seed, and also ULV cold- and warm-fogging formulations.

These formulations are produced in a known manner, for example by mixing the active compounds with extenders, that is liquid solvents, pressurized liquefied gases and/or solid carriers, optionally with the use of surface-active agents, that is emulsifiers and/or dispersants and/or foam formers. If the extender used is water, it is also possible to employ for example organic solvents as cosolvents. Suitable liquid solvents are essentially: aromatics, such as xylene, toluene or alkylnaphthalenes, chlorinated aromatics or chlorinated aliphatic hydrocarbons, such as chlorobenzenes, chloroethylenes or methylene chloride, aliphatic hydrocarbons, such as cyclohexane or paraffins, for example mineral oil fractions, alcohols, such as butanol or glycol as well as their ethers and esters, ketones, such as acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone, strongly polar solvents, such as dimethylformamide and dimethyl sulphoxide, and also water. Liquefied gaseous extenders or carriers are those liquids which are gaseous at ambient temperature and at atmospheric pressure, for example aerosol propellants such as halogenated hydrocarbons and also butane, propane, nitrogen and carbon dioxide. As solid carriers there are suitable: for example ground natural minerals, such as kaolins, clays, talc, chalk, quartz, attapulgite, montmorillonite or diatomaceous earth, and ground synthetic minerals, such as finely divided silica, alumina and silicates. As solid carriers for granules there are suitable: for example crushed and fractionated natural rocks such as calcite, pumice, marble, sepiolite and dolomite, and also synthetic granules of inorganic and organic meals, and granules of organic material such as sawdust, coconut shells, maize cobs and tobacco stalks. As emulsifiers and/or foam formers there are suitable: for example non-ionic and anionic emulsifiers, such as polyoxyethylene fatty acid esters, polyoxyethylene fatty alcohol ethers, for example alkylaryl polyglycol ethers, alkylsulphonates, alkyl sulphates, arylsulphonates and protein hydrolysates. As dispersants, for example, lignosulphite waste liquors and methylcellulose are suitable.

Tackifiers such as carboxymethylcellulose and natural and synthetic polymers in the form of powders, granules or latices, such as gum arabic, polyvinyl alcohol and polyvinyl acetate, as well as natural phospholipids, such as cephalins and lecithins, and synthetic phospholipids, can be used in the formulations. Other possible additives are mineral and vegetable oils. It is possible to use colorants such as inorganic pigments, for example iron oxide, titanium oxide and Prussian Blue, and organic dyestuffs, such as alizarin dyestuffs, azo dyestuffs and metal phthalocyanine dyestuffs, and trace nutrients such as salts of iron, manganese, boron, copper, cobalt, molybdenum and zinc.

The formulations in general contain between 0.1 and 95 per cent by weight of active compounds, preferably between 0.5 and 90 per cent by weight, based upon the total formulation.

According to the present invention, the succinate dehydrogenase inhibitors, preferably fluopyram, as such or their formulations, can also be used as a mixture with known fungicides, bactericides, acaricides, nematicides, or insecticides, for example, to broaden the activity spectrum or prevent the development of resistance. Γη many instances, synergistic effects are obtained, i.e. the activity of the mixture exceeds the activity of the individual components.

A further embodiment of the invention relates to the use of a composition comprising a succinate dehydrogenase inhibitor, preferably fluopyram, and a second fungicide extending shelf life of fruits and vegetables.

Suitable fungicides which can be used in combination with the succinate dehydrogenase inhibitor, preferably with fluopyram are selected from the group consisting of

(1) Inhibitors of the nucleic acid synthesis, for example benalaxyl, benalaxyl-M, bupirimate, clozylacon, dimethirimol, ethirimol, furalaxyl, hymexazol, metalaxyl, metalaxyl-M, ofurace, oxadixyl and oxolinic acid.

(2) Inhibitors of the mitosis and cell division, for example benomyl, carbendazim, chlorfenazole, diethofencarb, ethaboxam, fuberidazole, pencycuron, thiabendazole, thiophanate, thiophanate- methyl and zoxamide.

(3) Inhibitors of the respiration, for example diflumetorim as Cl-respiration inhibitor; bixafen, boscalid, carboxin, fenfuram, flutolanil, fluopyram, furametpyr, furmecyclox, isopyrazam (9R-component), isopyrazam (9S-component), mepronil, oxycarboxin, penthiopyrad, thifluzamide as Cll-respiration inhibitor; amisulbrom, azoxystrobin, cyazofamid, dimoxystrobin, enestroburin, famoxadone, fenamidone, fluoxastrobin, kresoxim-methyl, metominostrobin, orysastrobin, picoxystrobin, pyraclostrobin, pyribencarb, trifloxystrobin as Cni-respiration inhibitor.

(4) Compounds capable to act as an uncoupler, like for example binapacryl, dinocap, fluazinam and meptyldinocap.

(5) Inhibitors of the ATP production, for example fen tin acetate, fen tin chloride, fen tin hydroxide, and silthiofam.

(6) Inhibitors of the amino acid and/or protein biosynthesis, for example andoprim, blasticidin-S, cyprodinil, kasugamycin, kasugamycin hydrochloride hydrate, mepanipyrim and pyrimethanil.

(7) Inhibitors of the signal transduction, for example fenpiclonil, fludioxonil and quinoxyfen. Inhibitors of the lipid and membrane synthesis, for example biphenyl, chlozolinate, edifenphos, etridiazole, iodocarb, iprobenfos, iprodione, isoprothiolane, procymidone, propamocarb, propamocarb hydrochloride, pyrazophos, tolclofos-methyl and vinclozolin.

Inhibitors of the ergosterol biosynthesis, for example aldimorph, azaconazole, bitertanol, bromuconazole, cyproconazole, diclobutrazole, difenoconazole, diniconazole, diniconazole- M, dodemorph, dodemorph acetate, epoxiconazole, etaconazole, fenarimol, fenbuconazole, fenhexamid, fenpropidin, fenpropimorph, fluquinconazole, flurprimidol, flusilazole, flutriafol, furconazole, furconazole-cis, hexaconazole, imazalil, imazalil sulfate, imibenconazole, ipconazole, metconazole, myclobutanil, naftifine, nuarimol, oxpoconazole, paclobutrazol, pefurazoate, penconazole, piperalin, prochloraz, propiconazole, prothioconazole, pyributicarb, pyrifenox, quinconazole, simeconazole, spiroxamine, tebuconazole, terbinafine, tetraconazole, triadimefon, triadimenol, tridemorph, triflumizole, triforine, triticonazole, uniconazole, viniconazole and voriconazole.

Inhibitors of the cell wall synthesis, for example benthiavalicarb, dimethomorph, flumorph, iprovalicarb, mandipropamid, polyoxins, polyoxorim, prothiocarb, validamycin A, and valiphenal.

Inhibitors of the melanine biosynthesis, for example carpropamid, diclocymet, fenoxanil, phthalide, pyroquilon and tricyclazole.

Compounds capable to induce a host defence, like for example acibenzolar-S -methyl, probenazole, and tiadinil.

Compounds capable to have a multisite action, like for example bordeaux mixture, captafol, captan, chlorothalonil, copper naphthenate, copper oxide, copper oxychloride, copper preparations such as copper hydroxide, copper sulphate, dichlofluanid, dithianon, dodine, dodine free base, ferbam, fluorofolpet, folpet, guazatine, guazatine acetate, iminoctadine, iminoctadine albesilate, iminoctadine triacetate, mancopper, mancozeb, maneb, metiram, metiram zinc, oxine-copper, propamidine, propineb, sulphur and sulphur preparations including calcium polysulphide, thiram, tolylfluanid, zineb and ziram.

Further compounds like for example 2,3-dibutyl-6-chlorothieno[2,3-d]pyrimidin-4(3H)-one, ethyl (2Z)-3-amino-2-cyano-3-phenylprop-2-enoate, N-[2-(l ,3-dimethylbutyl)phenyl]-5- fluoro- 1 ,3-dimethyl- 1 H-pyrazole-4-carboxamide, N- { 2- [ 1 , 1 '-bi(cyclopropyl)-2-yl]phenyl } -3- (difluoro methyl)- 1 -methyl- lH-pyrazole-4-carboxamide, 3 -(difluoro methyl)- 1 -methyl-N- (3^4^5'-trifluorobiphenyl-2-yl)-lH-pyrazole-4-carboxarnide, 3-(difluoromethyl)-N-[4-fluoro- 2-( 1 , 1 ,2,3 ,3,3-hexafluoropropoxy)phenyl] - 1 -methyl- 1 H-pyrazole-4-carboxamide, (2E)-2-(2- { [6-(3-chloro-2-methylphenoxy)-5-fluoropyrimidin-4-yl]oxy}phenyl)-2-(methoxyimino)-N- methylethanamide, (2E)-2-{2-[({ [(2E,3E)-4-(2,6-dichlorophenyl)but-3-en-2- ylidene] amino }oxy)methyl]phenyl } -2-(methoxyimino)-N-methylethanamide, 2-chloro-N- (1 J -trimethyl-23-dmydro-lH-inden-4-yl)pyridine-3-carboxamide, N-(3-ethyl-3,5,5- trimethylcyclohexyl)-3-(formylamino)-2-hydroxybenzamide, 5-methoxy-2-methyl-4-(2- { [( { ( IE)- 1 - [3 -(trifluoromethyl)phenyl] ethylidene } amino)oxy] methyl }phenyl)-2,4-dihydro- 3H-l,2,4-triazol-3-one, (2E)-2-(methoxyimino)-N-methyl-2-(2-{ [({(1Ε)-1-[3-

(trifluoromethyl)phenyl] ethylidene }amino)oxy] methyl }phenyl)ethanamide, (2E)-2- (methoxyimino)-N-methyl-2-{2-[(E)-({ l-[3-(trifluoromethyl)phenyl]ethoxy}imino)methyl]- phenyljethanamide, (2E)-2-{2-[({ [(lE)-l-(3-{ [(E)-l-fluoro-2-phenyl- ethenyl]oxy}phenyl)ethylidene]amino}oxy)methyl]phenyl}-2-(methoxyimino)-N-methyl- ethanamide, l-(4-chlorophenyl)-2-(lH-l,2,4-triazol-l-yl)cycloheptanol, methyl l-(2,2- dimethyl-2,3-dihydro- IH-inden- 1 -yl)- lH-imidazole-5-carboxylate, N-ethyl-N-methyl-N'- { 2- me thyl-5 -(trifluoro methyl) -4- [3 - (trimethylsilyl)propoxy] phenyl } imidoformamide, N'- { 5 - (difluoromethyl)-2-methyl-4- [3-(trimethylsilyl)propoxy]phenyl } -N-ethyl-N-methylimi- doformamide, 0-{ l-[(4-methoxyphenoxy)methyl]-2,2-dimethylpropyl} lH-imidazole-1- carbothioate, N-[2-(4-{ [3-(4-chlorophenyl)prop-2-yn-l-yl]oxy}-3-methoxyphenyl)ethyl]-N²- (methylsulfonyl)valinamide, 5-chloro-7-(4-methylpiperidin-l-yl)-6-(2,4,6-trifluoro- phenyl)[l,2,4]triazolo[l,5-a]pyrimidine, 5-amino-l,3,4-thiadiazole-2-thiol, propamocarb- fosetyl, l-[(4-methoxyphenoxy)methyl]-2,2-dimethylpropyl lH-imidazole-l-carboxylate, 1- methyl-N- [2-( 1 , 1 ,2,2-tetrafluoroethoxy)phenyl] -3-(trifluoromethyl)- 1 H-pyrazole-4- carboxamide, 2,3,5,6-tetrachloro-4-(methylsulfonyl)pyridine, 2-butoxy-6-iodo-3-propyl-4H- chromen-4-one, 2-phenylphenol and salts, 3-(difluoromethyl)-l-methyl-N-[2-(l,l,2,2- tetrafluoroethoxy)phenyl]-lH-pyrazole-4-carboxamide, 3,4,5-trichloropyridine-2,6- dicarbonitrile, 3-[5-(4-chlorophenyl)-2,3-dimethylisoxazolidin-3-yl]pyridine, 3-chloro-5-(4- chlorophenyl)-4-(2,6-difluorophenyl)-6-methylpyridazine, 4-(4-chlorophenyl)-5-(2,6- difluorophenyl)-3,6-dimethylpyridazine, quinolin-8-ol, quinolin-8-ol sulfate (2:1) (salt), 5- methyl-6-octyl-3,7-dihydro[l,2,4]triazolo[l,5-a]pyrimidin-7-amine, 5-ethyl-6-octyl-3,7- dihydro[l,2,4]triazolo[l,5-a]pyrimidin-7-amine, benthiazole, bethoxazin, capsimycin, carvone, chinomethionat, chloroneb, cufraneb, cyflufenarnid, cymoxanil, cyprosulfamide, dazomet, debacarb, dichlorophen, diclomezine, dicloran, difenzoquat, difenzoquat methylsulphate, diphenylamine, ecomate, ferimzone, flumetover, fluopicolide, fluoroimide, flusulfamide, flutianil, fosetyl-aluminium, fosetyl-calcium, fosetyl-sodium, hexachlorobenzene, irumamycin, isotianil, methasulfocarb, methyl (2E)-2-{2- [( { cyclopropyl [(4 -methoxyphenyl)imino] methyl } thio)methyl]phenyl } -3 -methoxyacrylate, methyl isothiocyanate, metrafenone, (5-bromo-2-methoxy-4-methylpyridin-3-yl)(2,3,4- trimethoxy-6-methylphenyl)methanone, mildiomycin, tolnifanide, N-(4-chlorobenzyl)-3-[3- methoxy-4-(prop-2-yn-l-yloxy)phenyl]propanamide, N-[(4-chlorophenyl)(cyano)methyl]-3- [3-methoxy-4-(prop-2-yn-l-yloxy)phenyl]propanamide, N-[(5-bromo-3-chloropyridin-2- yl)methyl] -2,4-dichloropyridine-3-carboxamide, N- [1 -(5-bromo-3-chloropyridin-2-yl)ethyl] - 2,4-dichloropyridine-3-carboxamide, N-[l-(5-bromo-3-chloropyridin-2-yl)ethyl]-2-fluoro-4- iodopyridine-3-carboxamide, N-{(Z)-[(cyclopropylmethoxy)imino] [6-(difluoromethoxy)-2,3- difluorophenyl] methyl } -2-phenylacetamide, N- { (E)-[(cyclopropylmethoxy)imino] [6-

(difluoromethoxy)-2,3-difluorophenyl]methyl}-2-phenylacetamide, natamycin, nickel dimethyldithiocarbamate, nitrothal-isopropyl, octhilinone, oxamocarb, oxyfenthiin, penta- chlorophenol and salts, phenazine-l-carboxylic acid, phenothrin, phosphorous acid and its salts, propamocarb fosetylate, propanosine-sodium, proquinazid, pyrrolnitrine, quintozene, S- prop-2-en-l-yl 5-amino-2-(l-methylethyl)-4-(2-methylphenyl)-3-oxo-2,3-dihydro-lH- pyrazole-l-carbothioate, tecloftalam, tecnazene, triazoxide, trichlamide, 5-chloro-N'-phenyl- N'-prop-2-yn-l-ylthiophene-2-sulfonohydrazide and zarilamid.

In a preferred embodiment the second fungicide is trifloxystrobin. In a more preferred embodiment of the invention a composition comprising fluopyram and trifloxystrobin is used for extending shelf life of fruits and vegetables, preferably of strawberries.

A further embodiment of the present invention is a method extending shelf life of fruits and vegetables characterized in that, fluopyram was applied to the crop prior to the harvest of the fruits and vegetables. The present invention is exemplified by the following examples.

Examples

Strawberry (Fragaria spp.) plots were established 6.1 meters long by 0.5 meters wide, with 2 rows per plot arranged in a randomized complete block design with 4 replications each. Treatments were prepared in a standard water volume of 935 1/ha and applied to plots with a backpack sprayer. Treatments were:

Check (untreated)

FLU+TFS @ 4 oz/A (Fluopyram @ 73 g ha plus Trifloxystrobine @ 73 g ha)

FLU+TFS @ 5 oz/A (Fluopyram @ 92 g/ha plus Trifloxystrobine @ 92 g/ha)

Elevate @ 16 oz/A (Fenhexamid @ 560 g/ha) All ripe berries were collected from the plots 15 times (to establish baseline disease rating) and thereafter three times per week (usually 0 to 4 days after each application) and incubated on paper towels in separate plastic storage boxes at 17 °C.

Boxes were rated for the three post harvest diseases that developed by counting the number of infected berries per box. As berries melted from disease they were removed from each box to reduce within box contamination between berries (see Fig. 1 and Fig. 2). Data were recorded and graphed below as cumulative incidence of Rhizopus stolonifer (Table 1), Botrytis cinerea (Table 2), Penicillium spp. (Table 3), and cumulative total disease (Table 4).

Results

The two Huopyram containing treatments gave excellent control of the post harvest disease Rhizopus stolonifer. At the final rating just over 100 berries were infected compared to between 300 and 400 infected for the check and Elevate treatment. All three fungicides gave excellent control of Botrytis cinerea compared to the check. Cumulative total post harvest disease (Table 3) was lower for the two Huopyram treatments (approximately 400 berries) compared to the commercial standard Elevate (approximately 600 berries) and the check (approximately 700 berries). Two photos are included following the graphs below. The photos show the diseases on berries and demonstrate the improvement Fluopyram plus Trifloxystrobine treatments give over the currently available grower standard Elevate. Table 1: Cumulative incidence of berries with visual presence of Rhizopus stolonifer infection through 15 harvest dates.

Table 2: Cumulative incidence of berries with visual presence of Botrytis cinerea infection through 15 harvest dates.

Table 3: Cumulative total disease incidence of berries with visual presence of Rhizopus stolonifer, Botrytis cinerea and Penicillium spp. infection through 15 harvest dates.

April April April April April April April April April May May May May May May 9 1 1 15 1 8 21 23 25 28 30 2 5 7 9 12 14

Claims

Claims:

1. Use of succinate dehydrogenase inhibitors for extending shelf life of fruits and vegetables

2. Use according to claim 1, wherein the succinate dehydrogenase inhibitor is selected from the group consisting of fluopyram, isopyrazam, boscalid, penthiopyrad, N-[2-(l,3- dimethylbutyl)phenyl]-5-fluoro-l,3-dimethyl-lH-pyrazole-4-carbox-iamide, sedaxane and bixafen.

3. Use according to any one of claims 1 or 2, wherein the succinate dehydrogenase inhibitor is fluopyram.

4. Use according to any one of claims 1 to 3, wherein the fruits are selected from the group consisting of banana, blackcurrant, redcurrant, gooseberry, tomato, eggplant, guava, lucuma, chili pepper, pomegranate, kiwifruit, grape, table grapepumpkin, gourd, cucumber, melon, orange, lemon, lime, grapefruit, banana, cranberry, blueberry, blackberry, raspberry, boysenberry, hedge apple, pineapple, fig, mulberry, apple, apricot, peach, cherry, green bean, sunflower seed, strawberry and plum.

5. Use according to any one of claims 1 to 3, wherein the vegetables are selected from the group consisting of broccoli, cauliflower, globe artichokes, sweetcorn, maize, kale, collard greens, spinach, beet greens, turnip greens, endive; leeks, Brussels sprouts, celery, rhubarb, asparagus, ginger; potatoes, Jerusalem artichokes, sweet potato, yam bean sprouts, carrots, parsnips, beets, radishes, turnips, onions, garlic, shallots.

6. Use according to any one of claims 1 to 5, wherein the fruits are strawberries.

7. Use according to any one of claims 1 to 6, wherein the succinate dehydrogenase inhibitor was applied to the crop prior to the harvest of the fruits or vegetables.

8. Use according to any one of claims 1 to 7, characterized in that succinate dehydrogenase inhibitor is applied to the crop at a rate ranging from 1 to 250 g ha - based upon the pure a.s.

9. Use according to any one of claims 1 to 8, wherein a composition comprising an succinate dehydrogenase inhibitor and a further fungicide was applied to the crop or to its fruits or vegetables

10. Use according to claim 9, wherein the composition comprises fluopyram and trifloxystrobin.

11. Method for extending shelf life of fruits and vegetables, characterized in that, a succinate dehydrogenase inhibitor was applied to the crops prior to the harvest of the fruits or vegetables.

12. Method extending shelf life of fruits and vegetables in crops according to claim 10, characterized in that, the succinate dehydrogenase inhibitor is s selected from the group consisting of fluopyram, isopyrazam, boscalid, penthiopyrad, N-[2-(l,3-dimethyl- butyl)phenyl]-5-fluoro-l,3-dimethyl-lH-pyrazole-4-carbox-iarnide, sedaxan and bixafen.