Srivastava, AjaiNeeru2019-01-232019-01-232018-06-02http://krishikosh.egranth.ac.in/handle/1/5810092099The present investigation entitled “Population build up of rice caseworm and whorl maggot under mid hill conditions of Himachal Pradesh” were conducted at CSK Himachal Pradesh Krishi Vishvavidyalaya, Rice and Wheat Research Centre, Malan during kharif 2017. Population build up of rice caseworm and whorl maggot through larval population, light trap and sweep net were recorded. Adult activity of both rice caseworm and whorl maggot was observed first in 3rd week of July (29 SW) as recorded through light trap and sweep net. Rice caseworm remained active till 38 SW (4th week of September, 2017) and was at its peak during 32 SW (2nd week of August). Similarly whorl maggot remained active till 38 SW (4th week of September, 2017) and attained its peak during 34 SW (4th week of August, 2017). Correlation studies of light trap collection with abiotic factors indicated that the maximum temperature favours the development of rice caseworm whereas, minimum temperature favours the development of whorl maggot. About eleven natural enemies were found in the paddy fields out of which nine were generalized predators and two i.e. Trichogramma chilonis and Tetrastichus spp. were the specific parasitoid of whorl maggot. Among different treatments, dinotefuran (200 g ha-1) and monocrotophos (850 ml ha-1) were found most effective for the control of rice caseworm and whorl maggot, respectively.ennullThesis