Leafhopper Newsletter

Adult emergence in Mendocino Co., 3rd-4th instar nymphs in Lake Co. - June 22

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: 2 CEU’s APPLIED FOR

MENDOCINO COUNTY

In Mendocino County, we are seeing mostly 4th - 5th instars and many newly molted adults. At this point most of the Virginia creeper (VCLH) and Western grape leafhopper (WGLH) eggs have emerged.

We project that this week (June 19-25) we will continue to see mostly 5th instar nymphs and increased adult emergence. Adult populations should continue to grow in the following week (June 26 – July 2) and most of the remaining nymphs will have likely molted into adults.

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

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 3rd - 4th instar and we have started t observe newly molted adults.

Now is the time to monitor your vineyard to determine if control measures are warranted.