Leafhopper Newsletter

Adult emergence in Mendocino and Lake Co. - June 30

TAIL GATE MEETING ON JULY 7
UCCE Area Wide Virginia Creeper Leafhopper Project Research Update
Date: July 7, 2016
Time: 8-10:00 AM
Place: South Gate of the Sundial Chardonnay Vineyard (across from the Fetzer winery in Hopland), located on Old River Road north of Old Hopland.
Details: 2CEU’s APPLIED FOR

MENDOCINO COUNTY

Most of the remaining nymphs are 5th instar (stage) and adult emergence is well underway. The newly emerged adults are beginning to oviposit higher up in the vine canopy.

We project that this week (June 26 - July 2) we will continue to see increased adult emergence and most of the remaining nymphs will have molted into adults. Adult populations should continue to grow in the following week (July 3-9) in Redwood and Potter Valley.

LAKE COUNTY

Leafhopper populations are developing more slowly in Lake County relative to Mendocino County. We are currently seeing 1st – 5th instar (stage) VCLH and WGLH nymphs, although a majority of the nymphs are 4th - 5th instar and we have been seeing many more newly molted adults, indicating the beginning of adult emergence.

We are now seeing the start of adult emergence in Lake County and the ideal period for leafhopper control measures has ended for most vineyards in this region.

PARASITOID RELEASE PROGRAM

A batch of Anagrus daanei, the parasitoid that controls VCLH, was released on June 24 in Mendocino County near Talmage.