Leafhopper Newsletter

Adults and eggs peaking, nymphs increasing - Aug. 23

MENDOCINO COUNTY

Densities of both VCLH and WGLH adults and viable eggs are approaching (or just passed) peak density at most sites, while nymph densities of both species continue to increase. For the WGLH, this nymph 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 currently peaking) at all sites and we continue 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 19 at a vineyard in Mendocino County in the Hopland area.