Publication: Management of Spodoptera frugiperda J.E. Smith Using Recycled Virus Inoculum from Larvae Treated with Baculovirus under Field Conditions
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2023-08-03
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Insects
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Abstract
Fall armyworm (FAW) is a major pest of maize and causes huge losses. Chemical pesticides
are the commonly used control strategy among farmers. The efficacy of baculoviruses against FAW
has been proven; however, farmers may not be able to afford the products. The use of farmer-
produced baculovirus mixtures could provide an opportunity for a nature-based solution for FAW at
a low cost. This study evaluated the potential of recycled virus inoculum from FAW larvae treated
with a commercial baculovirus (Littovir) for the management of FAW under laboratory and field
conditions. In the laboratory, the virus from 25, 50, 75 and 100 FAW larvae caused variable mortality
among FAW instars. The highest mortality (45%) among 1st–3rd instars was caused by Littovir
followed by recycled virus inoculum from 100 FAW larvae (36%). Under field conditions, even
though recycled virus inoculum did not offer adequate protection against FAW damage, the maize
yield was comparable to that of commercial insecticide-treated plots and similar to that of control
plots. This study has shown the potential use of recycled virus inoculum from infected larvae for
the management of FAW. This would offer the farmers a sustainable and affordable option for the
management of FAW as it would require the farmers to purchase the commercial baculovirus once
and collect larvae from treated plots for repeat applications.