Effect of moisture regims on efficacy of metarhizium anisopliae against whitegrub, Holotrichia consanguinea
2003
Gupta, R.B.L. | Sharma, S. | Yadava, C.P.S.(AINP on Whitegrubs and Other Soil Arthropods, Durgapura (India). Project Coordinating Centre)
Effect of different moisture levels on infectivity of M. anisopliae isolate Ma-4 against larval stage of whitegrub (H. consanguinea) was determined. Mortality period was found to be reduced with the increase in soil moisture. Complete mortality in first and second instar larvae occurred within 1F and 31 days, respectively, when they were exposed to 16 or 18 per cent soil moisture as compared to 16 and 39 days period of mortality at lower soil moisture (8% v/w). In another pot experiment, initial soil moisture (13% v/w) recouped after every 72 or 96 h resulted high grub mortality than the moisture resumption done at every 24 h. However, resumption of moisture done at 120 h did not cause any mortality. Similarly, a high percentage of grub mortality (77% 6) was achieved when 50 ml water/pot at every 24 h was applied than that of only 11 to 33% mortality when 25 ml and/or 100 ml water was applied daily in each pot.
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