By Henry Wu, Technical Sales Support Representative, Chemtura AgroSolutions
2011 is still looking to be a good year for raisin grape growers, so protecting vines and bunches from mites as harvest approaches is imperative.
Growers in the southern San Joaquin Valley should pay special attention to Pacific spider mite populations. These mites feed on sun-exposed leaves and can severely damage the vine’s photosynthetic ability. This results in delayed sugar accumulation, later harvests, reduced raisin grades and even lower yields in following years.
Keep the following four tips in mind if mites are a problem in your vineyards:
Check levels of Pacific spider mites and beneficial insects, including the western predatory mite and sixspotted thrips. If more than 50 percent of leaves are infested with spider mites and predatory insect levels are low, use a chemical treatment.
Late-season mite outbreaks require strong materials to quickly and thoroughly knock down populations before further damage is done to the crop. Omite® -30WS miticide from Chemtura AgroSolutions is a good option for growers looking for effective knockdown of all motile mite stages. Omite offers three or more weeks of residual control and is easy on beneficial insects.
Good coverage is vital when applying miticides because Pacific spider mites prefer the folds and depressions on leaves—some of the hardest places to reach with a chemical application. For tips about achieving good spray coverage, check out “7 Ways to Keep Chemicals on Target”
When selecting materials for late-season mite control, take into account the modes of action and chemical classes of the miticides and insecticides you have already used this season. To avoid the risk of resistance development, don’t use a chemical from the same class as your last miticide application. Comparing product labels can help you quickly identify if the miticide you have chosen is from a different chemical class than previous materials you’ve used this season.
Always read and follow label directions.
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