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Molecular Entomology 2012, Vol.3, No.4, 18
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Indian Agricultural Research Institute, New Delhi
(India). Observations on pollinators were also taken
regularly during flowering stage and common
pollinators were preserved in the laboratory.
Pollinators and predators, viz., coccinellid beetles,
syrphid flies, honey bees, wasps, bumble bees,
carpenter bees and reduvid bugs were collected
directly by hand or through sweep net from the field,
preserved and identified with the help of reference
collection in the division. Spiders were manually
collected from the field and preserved in 75% ethyl
alcohol.
Total fifteen observations were recorded at weekly
basis throughout the season in each crop and those
arthropods recorded continuously for more than four
times was considered as a frequently occurred agent;
while remaining were considered as a rarely occurred
arthropod in brassica ecosystem.
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