SEASONAL INCIDENCE AND EVALUATION OF BIOPESTICIDES AGAINST DEFOLIATOR INSECT PESTS OF LUCERNE, Medicago sativa L. IN SEED PRODUCTION PLOT
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Date
2024
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MPKV, Rahuri
Abstract
Among the entomopathogenic fungal and viral biopesticides tested against
H. armigera and S. litura, Metarhizium rileyi (1×108 cfu/g) 1.15% WP found most
superior treatment against both the pest. HaNPV @ 500 LE/ha and SlNPV @ 500 LE/ha
were also effective treatments against H. armigera and S. litura respectively. As regards
seed yield M. rileyi (1×108 cfu/g) 1.15% WP recorded highest seed yield (3.20 q/ha.) with
ICBR 1:28.07. Whereas, the treatment with spraying Metarhizium anisopliae (1×108
cfu/g) 1.15% WP found at par with this treatment in respect of yield and recorded (3.12
q/ha) yield of seeds with ICBR 1:26.41. All the tested entomopathogenic fungal sprays,
viral sprays and their combinations did not affect the activities of honey bees in the
treated field of lucerne seed crop.
Study on the pollinator fauna, their relative abundance in lucerne revealed
that as many as 12 species of pollinators were foraging on lucerne flowers. Out of these,
hymenopterans included eight species forming 83.60 percent of total pollinators.
lepidopterans included three species and dipterans included two species which altogether
constituted 16.40 percent of total pollinators. The most dominant pollinator was
Apis florea (29.60 %) followed by A. cerena (13.60 %), A. dorsata (12.50 %) and
A. melifera (8 %)