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A model of the effect of codling moth granulosis virus on Cydia pomonella
Author(s) -
BRAIN P.,
GLEN D. M.
Publication year - 1989
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1989.tb06819.x
Subject(s) - codling moth , biology , larva , virus , gypsy moth , horticulture , biological pest control , virology , botany
Summary A model was developed based on an initial ingestion phase, followed by a period of virus multiplication and host death, to describe the effects of codling moth granulosis virus (CpGV) concentration and time from initial infection on the percentage of codling moth larvae ( Cydia pornonella ) dying from virus infection in the laboratory. With modification, this model also described the effect of CpGV concentration on the reduction of damage to fruit by C. pomonella larvae in the field. In both cases, the effect of CpGV increased with the l/10th power of virus concentration. LT 50 (time to death of 50% of larvae) was inversely related to virus concentration in the laboratory. The model predicts the threshold concentration for death of larvae, as well as LD 50 (C 50 and LD 90 (C 90 ,) for all ages of larvae. The model also predicts that if the majority of larvae entered through the sides of apple fruits, rather than through the calyx or near the stalk (as they probably did in the field), then the efficacy of CpGV in reducing fruit damage would be lowered. This effect of site of entry is especially marked at low virus concentrations.