Laboratory and Field Tests with the Granulosis of the Red-Banded Leaf Roller1

Publisher Website
Google Scholar
Abstract
A granulosis caused by a virus, Bergoldia clistorhabdion (W. and S.) has been observed in larvae of the red-banded leaf roller, Argyrotaenia velutinana (Wlk.) in an occasional apple orchard in New York. The disease has not been observed to be abundant enough to influence appreciably population levels. In the laboratory first instar larvae readily contracted the disease when fed on apple leaves treated with suspensions of triturated diseased larvae at dilutions from 1 last instar larva per 1000 ml. of water to 1 larva per 512,000 ml. of water. Disease symptoms and death developed more rapidly at the higher concentrations than at the lower. Suspensions of triturated diseased larvae at rates of 5,50 and 100 larvae per 100 gallons sprayed on apple trees during the hatching of first brood eggs infected and destroyed most larvae, but not before they damaged many fruits.

This publication has 0 references indexed in Scilit: