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Nuclear polyhedrosis virus infection ofPseudoplusia includens [Lep.: Noctuidae] larvae: Effect on post larval stages and transmission

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Abstract

Treatment ofPseudoplusia includens (Walker) larvae in either the 4th, 5th or 6th stage with a nuclear polyhedrosis virus (NPV) did not affect the weight or sex ratio of surviving pupae. Pupal mortality was low but increased with the dosage of the NPV larvae had received. Also, mortality of pupae from larvae treated in the 5th or 6th stage was higher than from larvae treated in the 4th stage. Adult longevity was not affected by the virus. Fecundity and egg viability were reduced following most treatments of 6th stage larvae but not 4th or 5th stage larvae.

Adults exposed to NPV at 3 dosages during the 6th larval stage were released in cages on soybean. Some of the progeny succumbed to NPV infection. Progeny mortality increased over a 7 week period of adult release, but did not differ significantly between treated and untreated groups by the end of the 7 week period.

Résumé

L'infection des larves dePseudoplusia includens Walker à l'aide d'un virus à polyèdres nucléaires n'a affecté ni le poids, ni la proportion entre les sexes des nymphes survivantes. La mortalité des nymphes fut peu élévée mais elle a augmenté avec l'accroissement de la dose de virus administrée aux larves. La mortalité des nymphes issues des larves infectées au 5e ou 6e stade larvaire fut plus élevée que celle des nymphes infectée au 4e stade. La longévité des adultes n'a pas été modifiée par le virus mais leur fécondité a été réduite. La viabilité des œufs des lépidoptères infectés au 6e stade larvaire fut réduite également, mais les œufs des adultes infectés au 4e ou 5e stade n'ont pas été affectés.

Des adultes ayant reçu 3 doses de virus au 6e stade larvaire ont été remis en liberté dans des cages avec du soja. Quelques descendants sont morts de virose. La mortalité dans la descendance a augmenté au cours des 7 semaines de lâcher des adultes mais la différence entre le niveau de mortalité des groupes infectés et celui des groupes non-infectés n'était pas significative.

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  1. Department of Entomology, University of Arkansas, 72701, Fayetteville, AR, USA

    S. Y. Young & W. C. Yearian

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  1. S. Y. Young
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Published with the approval of the Director, Arkansas Agricultural Experiment Station.

Use of a trade name does not imply endorsement or guarantee of the product or the exclusion of other products of similar nature.

This publication was supported in part with Federal funds from the National Science Foundation and the Environmental Protection Agency, through grant NSF GB-34718 to the University of California and the Environmental Protection Agency under grant number CR-806277-020. The findings, opinions, and recommendations expressed herein are those of the authors and not necessarily those of the University of California, the National Science Foundation, or the Environmental Protection Agency.

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Young, S.Y., Yearian, W.C. Nuclear polyhedrosis virus infection ofPseudoplusia includens [Lep.: Noctuidae] larvae: Effect on post larval stages and transmission. Entomophaga 27, 61–66 (1982). https://doi.org/10.1007/BF02371938

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