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Leafhopper Monitoring and Blog - 2018
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
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...
