Abstract
Relatively low dosages of a granulosis virus of Laspeyresia pomonella (L.) were disseminated in an Ohio apple orchard in 1974. Dosages of 107 (1/500 larval equivalent (L.E.), 108 (1/50 L.E.), and 109 (1/5 L.E.) capsules/tree sprayed during the 2nd generation reduced population levels by 0, 42, and 34%, respectively. Infestations also were reduced by 28% with a dosage of 109 capsules/tree. Larval populations were affected before entry, soon after entry, and after deep entry into apples. From 15–30% of the larvae in apples harvested from unsprayed trees were infected with granulosis. Apparently, virus increased and spread in the orchard after dissemination.
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