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Effect of spray droplet density and exposure time on the immobilization of newly hatched oriental fruit moth larvae

Effect of spray droplet density and exposure time on the immobilization of newly hatched oriental fruit moth larvae

Journal of Economic Entomology 69(4): 438-440

ISSN/ISBN: 0022-0493

DOI: 10.1093/jee/69.4.438

Effects of the number of spray droplets per unit area and rate of exposure to carbaryl residues of newly-hatched larvae of Grapholitha molesta (Busck) were assessed in the laboratory. Newly-hatched larvae traveled 0.68 mm/s and contacted droplet residues in direct relation to the number per cm2. They walked at least 5 h without nourishment. When exposed continuously to droplet patterns containing carbaryl, larvae reached a convulsive state in times inversely related to the number per cm2 and to the percent area covered with droplets. On a high density pattern, few contacts were needed to cause intoxication. With either continuous or short-term exposure the minimum interval to the convulsive state was 20-25 min. The findings are discussed in relation to populations in peach orchards.

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Accession: 005272186

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