Virginia Creeper Leafhopper Areawide Project
University of California
Virginia Creeper Leafhopper Areawide Project

Leafhopper Monitoring and Blog - 2017

Overview

Welcome to the Leafhopper Blog!

The "Leafhopper Newsletter" is now the "Leafhopper Blog". This change was made in order to improve readability and allow for comments/feedback.

Like the Leafhopper Newsletter, these blog posts will summarize data from the regional leafhopper monitoring effort in Mendocino and Lake County.

Below you will find a list of all blog posts. The full blog can be found here: http://ucanr.edu/blogs/leafhopperblog/index.cfm

 

Regional Leafhopper Monitoring

Timing of practices to control the Virginia Creeper Leafhopper (Erythroneura ziczac Walsh) are not the same as those for the Western Grape Leafhopper (Erythroneura elegantula Osborn). This is primarily because VCLH adults begin to oviposit earlier in the growing season, which then leads to earlier appearance of nymphs and next generation adults in the vineyard.

Starting in 2015, UCCE initiated a regional leafhopper monitoring program that includes weekly announcements about population development, parasitism rates and the appearance of key life stages in the vineyard.

This regional monitoring not only provides useful information for growers, but allows UCCE to track the spread of VCLH populations and identify outbreak "hot spots".

Blog Posts

End of Season Leafhopper Parasitism Counts and Nymph Data

Leafhopper Parasitism September 2018

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...

Posted on Wednesday, October 24, 2018 at 7:29 AM

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

August 9 VCLH nymphs per leaf

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...

Posted on Thursday, August 9, 2018 at 3:03 PM

Consult PCAs for Follow-up Applications for Leafhoppers

August 3 VCLH nymphs per leaf

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...

Posted on Wednesday, August 8, 2018 at 2:33 PM

Overlapping Leafhopper Life-Stages

July 19 VCLH nymphs per leaf

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...

Posted on Monday, July 23, 2018 at 2:15 PM

Leafhopper Parasitism Update - July 2018

Slide2

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...

Posted on Tuesday, July 17, 2018 at 9:29 AM

Second Generation Nymphs

June 28 VCLH nymphs per leaf

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...

Posted on Tuesday, July 3, 2018 at 9:40 AM

Adult leafhopper emergence has begun

VCLH eggs per leaf 5 31

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 #...

Posted on Friday, June 22, 2018 at 8:06 AM

Critical time for monitoring leafhoppers in vineyards before adult emergence

VCLH eggs per leaf 5 31

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...

Posted on Tuesday, June 12, 2018 at 7:25 AM

Critical time for monitoring leafhoppers in vineyards

VCLH eggs per leaf 5 31

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...

Posted on Tuesday, June 5, 2018 at 7:11 AM

VCLH nymphs began to emerge on May 14th, 2018

VCLH eggs per leaf 5 24

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...

Posted on Wednesday, May 30, 2018 at 1:36 PM

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...

Posted on Tuesday, May 1, 2018 at 7:49 AM

End of Regional Monitoring for 2017

VCLH - Lake - Sept 6

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...

Posted on Tuesday, September 12, 2017 at 12:18 PM

Overlapping Life-Stages Continue

VCLH - Lake - Aug 30

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.

Posted on Wednesday, September 6, 2017 at 5:39 PM

Overlapping Life-Stages Continue

VCLH - Lake - Aug 23

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...

Posted on Tuesday, August 29, 2017 at 4:35 PM

Overlapping Life-Stages Continue

VCLH - Lake - Aug 16

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...

Posted on Wednesday, August 23, 2017 at 12:09 PM

Overlapping Life-Stages Continue

VCLH - Lake - Aug 9

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...

Posted on Wednesday, August 16, 2017 at 3:13 PM

Adults, Eggs and/or Nymphs Continue to Increase

VCLH - Lake - Aug 2

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...

Posted on Tuesday, August 8, 2017 at 3:37 PM

Second Brood Adults Continue to Increase

VCLH - Lake - July 26

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...

Posted on Tuesday, August 1, 2017 at 9:19 PM

Second Brood Adults, Overlapping Life-Stages

VCLH - Lake - July 19

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...

Posted on Tuesday, July 25, 2017 at 8:00 PM

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...

Posted on Wednesday, July 19, 2017 at 4:06 PM
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