MANAGEMENT OF WOOLLY APPLE APHID, Eriosoma lanigerum (Hausmann) USING NEW INSECTICIDE MOLECULES AND BIOPESTICIDES
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Date
2017-10
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UHF,NAUNI
Abstract
ABSTRACT
The bioefficacy study revealed that, spirotetramat (0.015 %) proved best among the test
insecticide treatments resulting in 68.48 per cent reduction in colony count of woolly apple
aphid and was followed by flonicamid (0.05 %) which resulted in 61.31 per cent reduction in
colony count. When the data on colony size were recorded, it followed the same trend i.e.
spirotetramat (0.015 %) proved most efficacious causing 61.04 per cent reduction in aphid
colony size followed by flonicamid (0.05 %) with a reduction of 55.96 per cent. The higher
concentration of each test biopesticides i.e. B. bassiana (2x1010 cfus/L), fish oil (1.0 %),
neem oil (2.0 %) and azadirachtin (0.02 %) resulted in 29.17, 31.32, 28.95 and 29.83 per cent
reduction in colony count being at par. Similar trend was recorded in colony size. When the
safety to natural enemies of E. lanigerum was noticed, neem oil (1.0 %) and flonicamid
(0.025 %) proved safest to the parasitoid, A. mali with 60.00-80.00 per cent and 75.00-80.00
per cent adult emergence, respectively. Spirotetramat (0.015 %) and flonicamid (0.05 %)
were moderately safe with 55.00-60.00 and 60.00-65.00 per cent adult emergence,
respectively, and were at par with the earlier recommended insecticide, thiamethoxam (0.025
%) where adult emergence was 55.00-60.00 per cent. Chlorpyriphos proved most toxic to A.
mali where only 15.00-20.00 per cent adult emergence was recorded. In case of C.
septempunctata and H. variegate, fish oil at both the concentrations with no or very low
mortality, even after 72 hours of treatment proved safest followed by buprofezin; whereas,
chlorpyriphos (0.04 %) was most toxic to the coccinellid species causing upto 100 per cent
mortality. H. variegata was more sensitive to all the test insecticides and biopesticides as
compared to C. septempunctata.
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