Monitoring and evaluation of entomopathogenic fungi with other pesticides against mustard aphid under field condition of Chitwan, Nepal.

Rawat, P. R., Y. D. GC, R. B. Thapa and S. M. Shrestha. 2007. Research Advances Vol. 2. Institute of Agriculture and Animal Sciences, Rampur, Chitwan, Nepal. pp. 141-145.

Keywords: Mustard aphid, Metarhizium anisopliae, Beauveria bassiana, Verticillium lecanii, margosom

Six treatments viz., Metarhizium anisopliae, Beauveria bassiana, Verticillium lecanii, margosom, endosulfan and one control wer evaluated against mustard aphid (Lipaphis erysimi Kalt.) on rapeseed crop. All gave significant protection against aphid over control. However, endosulfan was the most effective as compared to other treatments. The population reduction over control due to endosulfan was 89.98% after 3 days of spray, which was decreased to 87.53% and 74.32% after 6th and 9th day of first spray respectively. Similar trend was observed in subsequent sprays. The population reduction of L. erysimi over control due to margosom, V. lecanii, B. bassiana and M. anisopliae after three days of spray was 57.75%, 47.36%, 46.81% and 40.43% in first spray while it was 54.64%, 48.99%, 43.44% and 40.30% in case of second spray, respectively. Aphid monitoring with yellow pan water trap showed aphid occurrence since middle of the November 2005 with initial catches of 6 aphids/trap. The peak population (27 aphids/trap) of aphids recorded on 19 January 2006. Monitoring study with yellow pan trap revealed, trapping increases with low temperature and high relative humidity.