Isaacs, MSU Entomology
adults are orange-yellow with some dark spots and yellow lines on
the forewings and about 1/8 inch long. Grape leafhopper has 1.5 to
2 generations per year, with peak abundance of adults occuring in
late July and again in late August. Adults overwinter in leaf litter
in or around vineyards and feed on weeds as temperatures exceed 60°F
(16°C) in the spring.
they move to young grape foliage in late May and early July to lay
clear, crescent-shaped eggs inside the leaves. First generation
eggs hatch in mid- to late June, and the flightless nymphs take
a month to develop into adults. Cold, wet springs and winters are
damaging to leafhoppers.
leafhopper adult. 3mm.
for grape leafhopper
vines, growers can sample for grape leaf-hopper in the third week
of July to determine the need for management. Examine 100 leaves
across two edge and two interior vine-yard sites. At each site,
inspect five leaves (leaves 3 to 7) on one shoot of five vines to
determine whether the leaves are showing any white/yellow stippling
on the upper leaf surface. If more than 10 leaves of the 100 show
damage, apply an appropriate control for the leafhoppers. If populations
are only at the vineyard edges, consider area-specific management.
Insecticides applied for grape berry moth may control grape leafhopper