By the Chemtura AgroSolutions team of experts
Continued warm summer temperatures mean webspinning spider mites, like the Pacific spider mite, should still be on your radar even if you’re not currently dealing with these pests.
When temps heat up, vines become stressed and vineyards get dustier—conditions conducive to the Pacific spider mite, say University of California Cooperative Extension experts.
While small numbers generally don’t cause serious economic damage, exploding mite populations can cause major destruction and reduce yields and quality, meaning you must stay on your toes to stay ahead of them.
Mite Monitoring and Management
To meet that goal, entomologists recommend continued monitoring of selected areas of the vineyard that are representative of the whole. PCAs and growers should also leaf sample regularly—weekly, if possible—for the presence or absence of both Pacific spider mites and beneficial predatory mites. The UC-Davis Insect and Spider Mite Monitoring Form provides detailed sampling instructions and treatment thresholds.
Keep in mind that research shows the presence of predatory mites sometimes allows growers to hold off on miticide applications, which can help reduce input costs and protect against resistance.
However, when PCAs and growers need to spray spider mites there are plenty of options. One of the best solutions for knocking down the mite populations is Acramite® 50WS miticide. Acramite is also safe for the predatory mite, protecting that balance of spider mite control.
As always, examine your situation and ask questions to determine the best material for your vineyard. And read and follow label directions when using any product to treat vineyards.
Also visit with your PCA or Chemtura AgroSolutions™ representative for additional ways to enhance your control program and ensure a successful season:
• 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