CROSS RESISTANCE IN INSECTICIDE RESISTANT POPULATION OF Chrysoperla zastrowi sillemi (Esben- Petersen) (NEUROPTERA: CHRYSOPIDAE) AND ITS PREDATORY POTENTIAL
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Date
2019-07-31
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE
Abstract
Cross resistance in insecticide resistant population (PTS-8) of Chrysoperla
zastrowi sillemi (Esben-Petersen) was evaluated against four insecticides viz.,
chlorpyriphos 20% EC, cypermethrin 10% EC, acetamipirid 20% WP and
chloranthraniliprole 18.5% SC under laboratory conditions. The resistant population
showed 16.37, 14.75, 12.74 and 7.15-fold resistance against chlorpyriphos, cypermethrin,
acetamipirid and chloranthraniliprole, respectively. The resistant population exhibited
moderate resistance to chlorpyriphos, cypermethrin and acetamiprid and low resistance to
chloranthraniliprole when compared to the susceptible population. Enzymatic study
revealed an elevated level of three major detoxifying enzymes i.e., carboxylesterase,
glutathione S-transferase and cytochrome p450 monooxygenase which was 1.48, 1.27
and 1.36-fold, respectively in the resistant population as compared to the susceptible
population that confirmed the involvement of detoxifying enzymes in the resistance
development. Among the three enzymes, enhanced carboxylesterase activity was
apparent in the resistant population. Predatory potential studies revealed the consumption
of 993.73 and 1030.47 Corcyra cephalonica eggs, 162.20 and 175.11 Aphis craccivora
by the larvae of the resistant and susceptible population, respectively. The non-significant
difference of predatory potential between the resistant and susceptible population
indicated that the resistant population was equally fit as compared to susceptible
population. Mass production of the insecticide resistant population of natural enemies and
their augmentative releases could help the natural enemies to sustain under insecticide
sprayed situations and supress the crop pests effectively.
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