of some new and conventional insecticides on Trichogramma chilonis
Ishii and Bracon brevicornis Wesmael under laboratory condition
Patra1* and A. Samanta2
1Division of Crop
Protection, ICAR Research Complex for NEH Region, Umiam - 793 103, India
Agricultural Entomology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur,
Nadia-741 252, India
Author E-mail: email@example.com
Paper received : 16.07.2016
Revised received : 28.11.2016
Re-revised received : 20.12.2016
Accepted : 30.12.2016
Aim: Insecticides that
are widely used to suppress various pests also disrupt the effectiveness of
various natural control agents. After application of insecticides, predators
and parasitoids may acquire insecticides via host, direct contact or by
ingesting floral nectar and pollen. The main objective of the study was to
find out the adverse effect of some new and conventional insecticides on Trichogramma
chilonis Ishii and Bracon brevicornis Wesmael under laboratory
were carried out on T. chilonis and B. brevicornis in Bidhan
Chandra Krishi Viswavidyalaya, West Bengal, India. The eggs of Corcyra
cephalonica Stainton were used as host for laboratory rearing of T.
chilonis, whereas full grown larvae were used for rearing of B.
brevicornis. Three doses (half of the recommended, recommended and double
the recommended dose) of pyridalyl 10EC, indoxacarb 14.5SC, chlorfenapyr
10SC, triazophos 40EC and chlorpyriphos 20EC were used along with control
treatment. Persistent toxicity study was carried out only with recommended
dose of each insecticide. The mortality data of different natural enemies
were analyzed following CRD. The corrected percentage mortality was
calculated for persistent toxicity study.
was highly toxic to T. chilonis with no emergence followed by
triazophos (1.32-10.44% emergence) and chlorfenapyr (4.22-13.63% emergence).
Pyridalyl and indoxacarb were relatively safe towards T. chilonis with
70.11-77.38 and 71.51-74.94 % adult emergence. Toxicity trend towards B.
brevicornis was similar to T. chilonis. Persistent toxicity study
revealed that pyridalyl and indoxacarb had short persistency, chlorfenapyr
was moderately persistent while conventional insecticides (triazophos and
chlorpyriphos) were highly persistent. ?????
study suggests that pyridalyl and indoxacarb can be used safely whereas
chlorfenapyr, triazophos and chlorpyriphos should be used with caution in
integrated pest management.
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