Resistance worries for fruit production

Using the PSD's revised assessment, Dr Jerry Cross of East Malling Research has drawn up a list of significant active substances used in fruit production that could be lost.

- Febuconazole (Indar) - one of the most effective scab fungicides on apples and pears, important for blossom wilt on apple/stone fruit.

- Iprodione (Rovral) - one of only two controls registered in the UK for post-harvest emergence of Botrytis on pears.

- Mancozeb (Karamate) - important protectant scab fungicide on apple and pear. Also suppresses pear sucker. Important on cultivars that are sensitive to captan.

- Myclobutanil (Systhane) - important triazole scab/mildew fungicide on top fruit. Also important for mildew in soft fruit.

- Penconazole (Topas etc) - important triazole mildewicide on a wide range of fruit crops.

- Tebuconazole (Folicur) - sole control for cane blight on raspberries; also for canker in orchards.

- Thiram - used for scab/storage control on top fruit with short harvest interval. Along with mancozeb it is the only control for the serious disease brown spot on pears (Stemphylium vesicarium).

- Pyrethroids (cypermethrin, lambda cyhalothrin, bifenthrin, deltamethrin) - important specific uses such as control of spider mite outbreaks with bifenthrin on strawberry in Scotland and use of deltamethrin for raspberry beetle.

- Chlorpyrifos - only effective control for raspberry cane midge. Also effective against many other pests on top and soft fruit. Only approved insecticide for control of vine weevil in soft fruit. Effective against capsids and woolly aphid in top fruit.

- Pirimicarb - widely used selective aphicide on top and soft fruit.

- Methiocarb - used for control of slugs and snails in strawberry and important for incidental protection against strawberry seed beetle.

Cross said: "Loss of these materials would reduce the ability to use alternative chemistries to reduce the development of resistance."

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