Effect of Insecticides on Eriophyes chibaensis Kadono (Acari: Eriophyidae) and the Leaf Mosaic Symptom on Japanese Pear in Chiba Prefecture, Japan

Abstract

Emergence of Eriophyes chibaensis Kadono and the leaf mosaic symptoms caused by the species on Japanese pear, which can be suppressed well by spraying machine oil in early-March, tolfenpyrad in early-May and chlorfenapyr in mid-May, were shown to be suppressed by spraying spirotetramat in late-April even better and for a longer period of time. Sulfoxaflor, which has been reported effective for the rust symptom by the species, was not effective for the leaf mosaic symptoms.