STUDIES ON ENTOMOPATHOGENIC NEMATODE, Steinernema (nr. riobrave) FOR THE BIOLOGICAL SUPPRESSION OF CUTWORM, Agrotis ipsilon HUFNAGEL (LEPIDOPTERA : NOCTUIDAE) ON POTATO
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Date
2003
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AAU, Anand
Abstract
Studies on entomopathogenic nematode , Steinernema (nr. riobrave) for tlie biological suppression of cutworm, A. ipsilon through laboratory bioassay followed by efficacy in pots and field, storage at different temperatures, vertical dispersal of Us in two soil types and compatibility of potent isolate with selected pesticides were carried out during 2001-2002. The pathogenicity of Steinernema (nr. riobrave) native isolates viz., GAU-A, GAU-D and GAU-M showed that among all the three, GAU-D was moderately virulent against A. ipsilon. Further studies on this Isolate indicated that 2nd and 3rd stage larvae of A. ipsilon were more susceptible compared to other stages. IJs of GAU-D (in vivo) survived for longer duration (6 weeks) at temperature 27 ± 2 °C compared to low (4-10 °C) and high (40 °C) temperatures. IJs vertically downward movement towards prey was better in sandy soil compared to medium black soil under laboratory condition and observed to move up to 40 cm in 96 h. GAU-D showed 96.6 % mortality of A. ipsilon at 2 x 10 power 5 IJs dose after 144 h in pots, where as. in field there was 68.9 % larval reduction over control by GAU-D @ 2 x 10 power 5 / m2 and found comparable to endosulfan and farmer's practices for cutworm suppression. More over, potato plant damage in GAU-D was low (10.92 %) over control (28.29 ,%). Endosulfan, carbaryl, carbofuran and methyl parathion were found less toxic and well tolerated by GAU-D at different doses tested.
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AGRICULTURAL ENTOMOLOGY, AGRICULTURE, A STUDY