By Henry Wu, Technical Sales Support Representative, Chemtura AgroSolutions
While a few mites won't cause economic damage, mite populations can quickly explode into the millions. Untreated mites can cause catastrophic destruction, reducing yield size and quality.
Willamette and Pacific spider mites can both wreak havoc in wine grapes, though the Pacific spider mite is by far the more damaging of the two species. Willamette spider mite feeding can turn foliage a yellowish bronze, but usually no burning occurs unless vines are weak.
Leaves with yellow spots are evidence of Pacific spider mites in the vineyard. The leaf burning, bronzing and webbing caused by these mites can completely kill leaves.
With Willamette mites striking in the early season and Pacific spider mites more prevalent later in the season, PCAs must monitor mite populations regularly all season long. The Insect and Spider Mite Monitoring Form from UC-Davis gives detailed monitoring instructions and treatment guidelines for spider mite species in grapes.
Monitoring mite populations includes watching populations of beneficial insects like western predatory mites, spider mite destroyers and sixspotted thrips. The best mite management programs are those that incorporate these natural predators.
The key to controlling undesirable mites while maintaining beneficial insect populations is to use the right chemistry at the right time. Start off the season with chemistry delivering good knockdown mite control without affecting beneficials, such as Acramite® 50WS. Acramite eliminates the majority of undesirable mites, giving beneficial insects a head start in keeping mite populations in check.
Acramite delivers rapid knockdown and residual controlof undesirable mites without affecting beneficial insects. Its unique carbazate chemistry also makes Acramite an excellent rotational miticide for resistance management.
Always read and follow label directions.
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