Journal of Entomological Science (2001) 36, 17-22

R.A. Goyer, H.X. Wei and J.R. Fuxa (2001)
Prevalence of viral diseases of the fruittree leafroller, Archips argyrospila (Walker) (Lepidoptera : Tortricidae), in Louisiana
Journal of Entomological Science 36 (1), 17-22
Abstract: A nucleopolyhedrovirus (NPV) and a granulovirus (GV) were found infecting field populations of fruittree leafroller, Archips argyrospila (Walker), larvae in Louisiana. Both viruses were recovered from infected larvae at 7 of 8 widely separated sampling sites. Additionally, a small proportion (<5%) of the larvae (maximum 10.2%) had double infections. Overall, infection rates ranged from 0 to 24.4 percent and were statistically correlated with defoliation and host population levels in a positive, density-dependent manner. It appears that though high populations and warm temperatures favor development of a widespread epizootic, the leaf rolls (shelters) protect larvae from contamination of low to moderate population levels. At outbreak larval densities, the rates of viral prevalence approached 25 percent, and the viruses, coupled with other natural control factors may, in time, become effective in population control.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Archips argyrospila		U.S.A. (mid S)