Leafhopper Newsletter

Increased eggs, nymphs and adults at most sites in Mendocino and Lake Co. - Aug. 17

MENDOCINO COUNTY

Densities of VCLH and WGLH adults, viable eggs, and nymphs are all increasing at almost every site in Mendocino County. For the WGLH, this population increase represents the second brood, whereas for VCLH the nymphs are likely a mix of the second and third brood (later instars are from the second brood and earlier instars from the third brood).

LAKE COUNTY

WGLH adult populations have peaked (or are peaking) at all sites and we are now starting to see an increase in nymph densities at most sites. These nymphs represent the second WGLH brood.

VCLH adult and nymph densities are generally low and more variable across all sites. Where present, VCLH adult densities are relatively low (less than 3 adults per trap). While no VCLH nymphs have been observed recently in the Lake Co. vineyard being monitored, if they do appear they will represent the third brood.

PARASITOID RELEASE PROGRAM

Two batches of Anagrus daanei, the parasitoid that controls VCLH, were released on August 12 at a vineyard in Mendocino County in the Talmage area.