Vertical transmission of sublethal granulovirus infection in the tobacco caterpillar <Emphasis Type="Italic">Spodoptera litura</Emphasis> |
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Authors: | R K Gupta Mudasir Amin K Bali Md Monobrullah P Jasrotia |
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Institution: | (1) Division of Entomology, Shere-e-Kashmir University of Agricultural Sciences and Technology of Jammu, Jammu, Chattha, 180009, India;(2) Indian Institute of Natural Resins and Gums, Namkum, Ranchi, 834010, India;(3) W.K. Kellogg Biological Station, Michigan State University, East Lansing, MI 48824, USA;(4) Present address: Laboratory of Zoophysiology and Pathology, S 33, Ghent University, Ghent, 9000, Belgium |
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Abstract: | Larvae that survived sublethal infection of Spodoptera litura granulovirus (SlGV) as 4th and 5th instars led to an increase in the larval period of treated larvae when compared with control. While pupal
period and pupal weight remained unaffected, a significant alteration in sex ratio was observed. Although survivor moths could
mate successfully, there was a significant reduction in the proportion of ovipositing females in treated larvae as compared
with control. A significant reduction in fecundity of moths emerging from treated larvae was also noticed, but the egg viability
was never influenced by the treatment. However, there was a significant increase in progeny mortality in treated larvae over
control. The offspring mortality in survivors increased up to three subsequent generations but not thereafter. Hence, repeated
field applications of inoculum are required. The implication of the present findings in terms of reduced fecundity coupled
with increased larval development indicates that vertical transmission can lead to increased virus dispersal, both of which
would reduce the host's innate capacity for population increase. This is particularly important in S. litura, which is a migratory species and occurs sporadically in a particular agro-ecosystem. |
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