Leafhopper Newsletter

Nymph emergence continues - May 25

We have been seeing mostly 2nd-3rd instar (stage) nymphs and expect 4th-5th instars to appear this week. Additional leafhopper nymphs will continue to emerge in the coming week as well.

This is the week to monitor your vineyard to determine is control measures will be necessary.

Parasitism of Western grape leafhopper has been consistent at all sites since May 5, indicating that the regional population of Anagrus spp. parasitoids have colonized the vineyards. There is practically no parasitism of Virginia creeper leafhopper.

A batch of Anagrus daanei, the parasitoid that controls Virginia creeper leafhopper, was released on May 20 in Mendocino County near Talmage.