By Dr. Henry Wu, Technical Sales Support Representative, Chemtura AgroSolutions
Hot weather means raisin grape growers need to remain vigilant against mites in vineyards, even as they prepare for harvest.
Recent high temperatures have left vines vulnerable to mite flare-ups, since these pests thrive in hot weather and feed on sun-exposed leaves. These population explosions can occur quickly since it only takes three to five days for a new generation to begin.
Therefore, growers need to protect grape vine leaves so the plant can continue photosynthesis and store carbohydrates in preparation for winter. If leaves are too damaged, or if early defoliation occurs, it sets the stage for lower yields next season.
Monitor Mite Levels
That protection begins with monitoring vineyards to determine spider mites intensities. Species to watch for include the Willamette mite: Eotetranychus willamette, the Pacific mite: Tetranychus pacificus, and theTwo Spotted mite: Tetranychus urticae.
Also monitor levels of beneficial insects like the western predatory mite, minute pirate bugs and sixspotted thrips.
Acramite has a unique mode of action and provides rapid knockdown and excellent residual control of all motile stages—it also provides high egg mortality of Tetranychid mites. It offers a much sought-after option to commonly used miticides which have developed resistance. Research has demonstrated the absence of cross-resistance with other currently registered miticides.
Acramite does not affect populations of beneficial insects and predatory mites. It also fits well into Integrated Pest Management (IPM) programs.
Remember to Rotate
When selecting materials for late-season mite control, remember to take into account the modes of action and chemical classes of the miticides and insecticides you’ve already used this season. To avoid potential issues, choose a chemical from a different class as your last miticide application. You can find this information on the product label.
Lastly, always read and follow label directions.