POPULATION DYNAMICS OF Aphis gossypli GLOVER, Myzus persicae SULZER AND Amrasca bigutfula biguffula ISHIDA OF TOMATO IN RELATION TO ABIOTIC FACTORS

摘要

Population dynamics of mix population of tomato aphids, Aphis gossypii Glover & Myzus persicae Sulzer and jassid, Amrasca biguttula biguttula Ishida was studied during 2000-01 and 2001-02. The population of aphids per plant fluctuated from 2.2 and 2.4(during 37th meteorological week) to 13.4 (during 47th meteorological week) and 13.8 (during 46th meteorological week). Incedence of jassid varied from 2.2 (during 37th meteorological week) and 2.4 (during 37th meteorological week) to 8.4 (during 40th meteorological week) and 8.2 (during 41st meteorological week) during first and second year, respectively. Correlation between aphid population and mean temperatures were significant negative in both the year but with mean relative humidity it was positive in first year and negative in the second year experiment but both the year it was non significant. In case of jassid population it was significant positive correlated with mean temperature in both the year. Correlation between mean relative humidity and jassid population was significant negative in first year and non significant positive in second year.