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Effects of Host Age, Virus Dosage, and Temperature on the Infectivity of a Nucleopolyhedrosis Virus Against Velvetbean Caterpillar, Anticarsia gemmatalis , Larvae 1

Authors :
George E. Allen
Drion G. Boucias
Douglas Johnson
Source :
Environmental Entomology. 9:59-61
Publication Year :
1980
Publisher :
Oxford University Press (OUP), 1980.

Abstract

The inter-instar susceptibility of the velvetbean caterpillar to a nucleopolyhedrosis virus was quantitated. Analysis of response curves revealed a 930-fold range in susceptibility between the most sensitive and the most resistent individuals in these larval populations. The LD50 values for 2nd, 3rd, 4th, and 5th instars were 103, 432, 682, and 4100 polyhedra/larva, respectively. At 26.7°C the virus replicated efficiently in all larval instars. Virus replication was slower at lower temperatures (15.6°C, 21.1°C) but the cumulative virus mortality at these these temperatures were similar fo that achieved at 26.7°C. Incubation at higher temperatures (32.2°C), however, caused a 30–50% less virus mortality than occurred at lower temperatures.

Details

ISSN :
19382936 and 0046225X
Volume :
9
Database :
OpenAIRE
Journal :
Environmental Entomology
Accession number :
edsair.doi...........1f5f68253b3b1700888793f7fc5378a7