Spider Mites Showed up Late This Season

By Lauren Dutra, Associate Editor

This year, near-perennial spider mite pressure on almonds was delayed until hull-split. “That’s the big story this year,” said David Haviland, UC Cooperative Extension entomology farm advisor, Kern County. “The orchards of people who did early management programs well their fields looked great until hull-split. And the orchards of people who did not do anything well their fields looked great at hull-split as well—when the mites showed up,” he said.

Almond hull-split

“And a good population of them arrived,” Haviland continued.  “People sprayed, but now we’re at the beginning of September, and everyone I have talked to in the Southern San Joaquin Valley have reported the arrival of the sixspotted thrip, a beneficial spider mite predator. The thrips came in fierce, cleaning out anything that didn’t get controlled prior to Nonpareil harvest,” said Haviland.

“We are on the tail end of the season in Kern County, and mites ought to be going away in a couple of weeks,” he said.

Haviland also explained the appearance of navel orangeworm this year is about average. “As far as navel orangeworm goes, things are looking good. They are certainly out there. They’re certainly in some nuts, but trap captures have been about normal, so—nothing really alarming in terms of numbers,” Haviland noted. “I haven’t heard of anybody really getting hit hard this year, other than some orchard edges here and there.”

“Growers seem to be happy. We are about halfway through the harvest, hoping the second half of almond-shaking goes just as well as the first,” said Haviland.