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PATHOGENICITY OF TWO NUCLEAR POLYHEDROSIS VIRUSES IN THE BLACK CUTWORM, AGROTIS IPSILON (LEPIDOPTERA: NOCTUIDAE)1, 2

Published online by Cambridge University Press:  31 May 2012

Timothy B. Johnson  and
Leslie C. Lewis
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Abstract

LC50 and LT50 values for two multicapsid nuclear polyhedrosis viruses isolated from the alfalfa looper, Autographa californica (Speyer), and a mint looper, Rachiplusia ou (Guenée), were determined against black cutworm, Agrotis ipsilon (Hufnagel), neonate larvae, 1-day-old larvae reared at 15 °C before testing, and 1-day-old larvae reared at 27 °C before testing. The results showed that black cutworm larvae have low to moderate susceptibility to these viruses. As the larvae developed, their susceptibility to the viruses rapidly declined. Initial growth of larvae surviving sublethal dosages of these viruses was reduced, but pupal weights of these larvae were not significantly different from untreated controls.

Résumé

Les valeurs de la CL50 et du TL50 pour 2 virus multicapsides à nucléopolyhédroses isolés à partir de l'autographe de la luzerne, Autographa californica (Speyer), et d'une enrouleuse de la menthe Rachiplusia ou (Guenée) ont été déterminées contre le ver-gris noir Agrotis ipsilon (Hüfnagel) aux stades larves neonate, larves de 1 jour préalablement élevées à 15 °C, et larves de 1 jour préalablement élevées à 27 °C. Les résultats ont montré que les larves du ver-gris sont peu à modérément susceptibles à ces virus. Leur susceptibilité au virus a diminué rapidement avec le développement. La croissance initiale des larves survivant à des doses subléthals de ces virus a été réduite, mais le poids des chrysalides obtenues ne différait pas significativement des témoins non traités.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 4 , April 1982 , pp. 311 - 316
Copyright
Copyright © Entomological Society of Canada 1982

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