David Owens, Extension Entomologist, owensd@udel.edu Japanese beetles and June beetles are active. June beetles will feed on raspberry and blackberry fruit. Japanese beetles will cause defoliation. They aggregate and may need to be spot treated in some plantings.
David Owens, Extension Entomologist, owensd@udel.edu Vineyards Pay special attention to Japanese beetle. A small demo plot at Carvel had significant defoliation this week. Defoliation thresholds for Japanese beetle are 15 to 20 percent leaf defoliation. Tree fruit Stink bugs continue… Continue Reading
David Owens, Extension Entomologist, owensd@udel.edu Congratulations to Richard Wilkins and many others for correctly identifying last week’s pest as Japanese beetles. They started coming out in the last couple of weeks. Although they feed on numerous hosts, they do have… Continue Reading
David Owens, Extension Entomologist, owensd@udel.edu Grapes Japanese beetles have begun emerging this week. Scout vineyard edges for beetle congregations. Wisconsin entomologists recommend using a 30% defoliation threshold before using an insecticide but note that other fruit crops may be more… Continue Reading
David Owens, Extension Entomologist, owensd@udel.edu Congratulations to Chris Cawley and Buzz Lowe for correctly identifying the corn photos as Pythium and Japanese Beetle! Japanese beetle feeding on corn. For a brief discussion of Japanese beetle, see the field corn section… Continue Reading
