Impact of abiotic factors on seasonal incidence of sucking pests in transgenic cotton ecosystem

Author: 
Rita sharma and Leena sharan

Studies was carried out to investigate impact of abiotic factors on seasonal incidence of sucking pests of transgenic cotton viz., jassid (Amrasca biguttula biguttula Ishida), whitefly (Bemisia tabaci Gennadius) and thrip, (Thrips tabaci Lindeman), under unproctected condition. The results of the field study revealed that all the sucking pests first appeared in first week of July (27th standard week), but jassid remained active till third week of October (42th standard week), white fly population was observed till last week of October (43th standard week) and thrips was observed till third week of September (38th standard week) on Bt cotton. The peak population of jassid, whitefly and thrips were 2.33, 27.07 and 51.0 per three leaves in 34th standard week for jassid, 33th Standard week for whitefly and 35th Standard week for thrips, respectively. After that the population of sucking pests declined gradually. Jassid disappeared in last week of October (43th standard week) and thrips disappeared in last week of September (39th standard week) but whitefly was observed till last week of October (43th standard week). The correlation study revealed that the mean temperature had positive and significant correlation with the population of jassid, whitefly. In the present investigation it was also found that relative humidity (%) and rainfall had no significant role on jassid, whitefly and thrips population however the trend was positive for all the factors except for mean relative humidity for whitefly, which was negatively correlated.

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