Leafhopper Newsletter

Adults mostly passed peak but remain elevated, nymphs starting to peak as well - Sept. 21

MENDOCINO COUNTY

Densities of VCLH adults remain elevated at most sites while WGLH adult populations have peaked and are now relatively low, with the exception of Potter Valley, where WGLH adult densities may be rising again. Nymph densities of both VCLH and WGLH appear to have peaked (or are currently peaking) as well.

LAKE COUNTY

VCLH densities are generally low and more variable across all sites (less than 3 adults per trap). No VCLH nymphs have been observed since mid-July, with the recent exception of Scotts Valley and Finley, but densities are still very low (less than 0.5 nymphs per leaf). WGLH adult populations have peaked at all sites and we are now seeing nymph densities peaking (or just passed peak) at most sites with the exception of Finley (no WGLH nymphs observed since June).

PARASITOID RELEASE PROGRAM

No parasitoids were released last week and no further releases are scheduled for 2016 in order to build up populations in our greenhouse colonies in preparation for the fall-winter period.