Leafhopper Monitoring and Blog - 2017

Blog Posts

End of Season Leafhopper Parasitism Counts and Nymph Data

Nymphs In 2018, we conducted weekly nymph counts at three vineyard locations in Mendocino County from May 24- September 6. The first emergence of VCLH nymphs occurred during the week of May 14th (Table 1, Figure 1) and densities peaked on June 8, July...

Consult PCAs for Follow-up Applications for Leafhoppers - August 9th Update

Monitoring efforts during the week of May 14th showed the first emergence of VCLH nymphs for the season (see Table 1/Figure 1 for # VCLH nymphs per leaf). The numbers of nymphs decreased on the week of June 11th as the three vineyards we are monitoring...

Consult PCAs for Follow-up Applications for Leafhoppers

Monitoring efforts during the week of May 14th showed the first emergence of VCLH nymphs for the season (see Table 1/Figure 1 for # VCLH nymphs per leaf). The numbers of nymphs decreased on the week of June 11th as the three vineyards we are monitoring...

Overlapping Leafhopper Life-Stages

Monitoring efforts during the week of May 14th showed the first emergence of VCLH nymphs for the season (see Table 1/Figure 1 for # VCLH nymphs per leaf). The numbers of nymphs decreased on the week of June 11th as the three vineyards we are monitoring...

Leafhopper Parasitism Update - July 2018

On July 9 we surveyed parasitism of Western grape leafhopper (WGLH) and Virginia creeper leafhopper (VCLH) across 9 sites in Mendocino and Lake counties (Fig. 1). WGLH parasitism was fairly consistent (average 38%), but there was little to no VCLH...

Second Generation Nymphs

Virginia creeper leafhopper and Western grape leafhopper peak egg laying from the overwintering adults has passed (Fig. 1 & 2). Monitoring efforts during the week of May 14th showed the first emergence of VCLH nymphs for the season (see Table...

Adult leafhopper emergence has begun

Virginia creeper leafhopper and Western grape leafhopper peak egg laying from the overwintering adults has passed (Fig. 1 & 2). Monitoring efforts during the week of May 14th showed the first emergence of VCLH nymphs for the season (see Table 1 for #...

Critical time for monitoring leafhoppers in vineyards before adult emergence

Virginia creeper leafhopper and Western grape leafhopper peak egg laying has passed (Fig. 1 & 2). Monitoring efforts during the week of May 14th showed the first emergence of VCLH nymphs for the season (see Table 1 for # VCLH nymphs per leaf). On...

Critical time for monitoring leafhoppers in vineyards

Virginia creeper leafhopper and Western grape leafhopper continued laying eggs on basal leaves (see Fig. 1 & 2), although peak egg laying has passed. Monitoring efforts during the week of May 14th showed the first emergence of VCLH nymphs for the...

VCLH nymphs began to emerge on May 14th, 2018

VCLH nymphs began to emerge on May 14th, 2018 This season we will once again be monitoring the development of Virginia creeper leafhopper, VCLH, (Erythroneura ziczac) and Western grape leafhopper, WGLH, (Erythroneura elegantula) populations in Mendocino...

2018 Leafhopper Monitoring Update and Egg Deposition

This season we will once again be monitoring the development of Virginia creeper leafhopper, VCLH, (Erythroneura ziczac) and Western grape leafhopper, WGLH, (Erythroneura elegantula) populations in Mendocino County Chardonnay vineyards. The monitoring...

End of Regional Monitoring for 2017

We continue to see a mix of life-stages of both VCLH and WGLH at all of the regional monitoring sites (Figs. 1-2). As we move into the fall, adults will begin to enter reproductive diapause. These will be the leafhoppers that overwinter in your...

Overlapping Life-Stages Continue

All life-stages of both VCLH and WGLH are present in all vineyards (Figs. 1-2). Changes in densities of each life-stage over the past week varied across the sites.

Overlapping Life-Stages Continue

All life-stages of both VCLH and WGLH are present in all vineyards (Figs. 1-2). Adult densities appear to be increasing the most, although changes in densities of each life-stage over the past week varied across the sites. Two batches of A. daanei were...

Overlapping Life-Stages Continue

Adults, viable eggs and nymphs of both VCLH and WGLH are present in all vineyards (Figs. 1-2). Changes in the density of each life-stage over the past week varied across the sites. Another batch of A. daanei was released on Friday Aug. 18 in the Big...

Overlapping Life-Stages Continue

Adults, nymphs and viable eggs of both VCLH and WGLH are present in all vineyards (Figs. 1-2). Over the past week nymph densities appear to have increased the most relative to the other life-stages. Another batch of A. daanei was released last Friday...

Adults, Eggs and/or Nymphs Continue to Increase

Multiple, overlapping life-stages of both VCLH and WGLH are present at all sites and densities of adults, eggs and nymphs all continued to increase at most sites over the past week (Figs. 1-2). We are now seeing adult egg deposition higher up into the...

Second Brood Adults Continue to Increase

We continue to see increased adult densities of Virginia creeper leafhopper (VCLH) and Western grape leafhopper (WGLH) at most sites (Figs. 1-2). All life-stages (i.e. adults, eggs, nymphs) of both VCLH and WGLH are present in the vineyard now as these...

Second Brood Adults, Overlapping Life-Stages

We continue to see increased densities of second brood adults of both Virginia creeper leafhopper (VCLH) and Western grape leafhopper (WGLH) at most sites (Figs. 1-2). Nymphs and eggs are present at many sites as well and we will likely continue to see...

Tailgate Meeting - TOMORROW - Fri. July 21 - Hopland

Details: We'll be holding a "Tailgate Meeting" on Friday July 21 from 8-10am in Hopland. The plan is to provide updates and discuss the UCCE Area Wide IPM Program for Virginia Creeper Leafhopper. This meeting has been approved for 2.0 CE units of...