By the Chemtura AgroSolutions team of experts
Mealybugs and spider mites aren’t ready to give up and put the 2013 growing season in the books. Instead, these vineyard pests are hanging around and making a nuisance of themselves while growers are focused on harvest.
Therefore, you still need to be vigilant against these profit robbers.
For mealybugs, check grape clusters for infestation and vines to see if these pests have moved into the bark. Depending on the level of infestation and species involved, you may want to consider a targeted contact insecticide application—be sure to identify which species is present, as postharvest treatments are more effective for some species than others.
Also note that foliar treatments are not effective once mealybugs have moved into the clusters and after bunches in wine grape varieties have closed.
Where the pest is present, be sure to flag vines so you can treat the afflicted area next spring. This strategy helps track the non-flying pests movement, as well as target control efforts to areas where it’s needed.
Meanwhile, it’s still important to monitor mite populations since they can quickly flare up as conditions allow. Raisin grapes are vulnerable to late-season mite infestations since water supplies are limited for harvest and to encourage crop drying. Since lack of water stresses vines, be sure to prevent mites from damaging your vineyard.
Tools like Acramite® 50WS miticide, which delivers good knockdown mite control without affecting beneficials, is a key part of your arsenal. Acramite features a 14-day preharvest interval and a re-entry interval of only 12 hours, making it part of a good late season pest management program. Plus, its unique carbazate chemistry also makes Acramite an excellent rotational tool for resistance management.
Discuss late-season pest management with your PCA or Chemtura AgroSolutions representative for additional ways to enhance your control program and ensure a successful harvest:
• Mike Ansolabehere, Southern San Joaquin Valley: (661) 304-3023; email Mike.Ansolabehere@Chemtura.com
• Matt Loftus, Central San Joaquin Valley: (559) 960-1112; email Matthew.Loftus@Chemtura.com
• Eric Leer, North Central California: (209) 531-6478; email