The grape mealybug, Pseudococcus maritimus (Ehrhorn), is an occasional serious pest of pears in north-central Washington state (NCW). A tree-banding study indicates the occurrence of a single generation of P. maritimus on pear in NCW. An encyrtid parasite, Acerophagus notativentris (Girault), is common in infested orchards and completes two to three generations per year. A. notativentris is solitary in 1st-instar P. maritimus and gregarious in later host instars. The parasite was observed ovipositing in P. maritimus eggs. Crawlers hatching from these eggs were parasitized.
Document Type: Research Article
Publication date: June 1, 1982
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