Effect of abiotic factors on infestation of Uzifly (Exorista sorbillans Wiedemann) in different instar muga silkworm, Antheraea assamensis

摘要

 Infestation of Uzi fly (Exorista sorbillans ) in muga silkworm was studiedin six different crop seasons. Though the infestation was made throughout the year but severity was recorded during Chatua (Feb-Mar) and Jarua (Dec-Jan) crops with 89.3, and 61.4% infestation and also infestation was started from the 3rd instar silkworm larvae. During Jethua (Apr-May) and Katia (Oct-Nov) crops, the infestation was recorded 11.3 and 13.3% and infestation was observed in 4th and 5th instar silkworms. However, least number of infestation was recorded in Aherua (Jun-Jul), Bhodia (Aug-Sep) with 4.7and 3.9% infestation which were observed in 5th instar larvae only.Correlation coefficient analyses between infestation and weather parameters in different crops seasons showed that low temperature and high humidity were positively highly significant for infestation of Uzifly in muga silkworms