Journal of Entomology and Zoology Studies

Volume 3, Issue 3

Effect of temperature ramping on the mortality of mango mealy bug, Droschia mangiferae under laboratory conditions

Author(s): Partha Sarathi Nandi, Kaushik Chakraborty

Abstract: Effective alteration of temperature regimes is found prudent to check the insect pest menace as insects are poikilothermic. Effect of high (40-50 _^°C), moderate (14 _^°C and18 _^°C) and low temperature (-4-0 _^°C) regimes on the survivability of mango mealy bug, Droschia mangiferae was noted in laboratory condition. High temperature regime starts from 40 _^°C and low temperature from -4 _^°C respectively. Temperature of both high and low was subsequently increased for 2 _^°C for each step. Extent of sample insect mortality, in gross, was in consonance with the degree of elevated high temperature and also with the retention time. Even exposure of 10-20 minutes was sufficient to achieve 100% mortality at 480 and 50 _^°C. However, moderate temperature of 14 _^°C and 18 _^°C has very little visible effect on the morbidity of the mealy bug. When the sample was kept at low temperature of 4 _^°C and 0 _^°C, for 10 and 20 minutes respectively, 86.7% and 100% died.

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