000			02746nam a2200217 4500
003			OSt
005			20250116145149.0
008			250116b |||||||| |||| 00| 0 eng d
040			_cUniversty of Agricultural Dharwad
041			_aEnglish
082			_a595.7 _bKIR
100			_aKiran B.
245			_aStudies on Biology and Management of Black Flower Thrips, Thrips parvispinus (Karny) in Chilli
250			_aM.Sc. (Agri)
260			_aDharwad _bUniversity of Agricultural Sciences _c2024
300			_a113 _c32 Cms
520			_aABSTRACT Investigation on survey, biology and management of black flower thrips, Thrips parvispinus (Karny) in chilli was conducted at the Department of Entomology, College of Agriculture, Vijayapur and KVK, Vijayapur, Karnataka during 2023-24. A roving survey in chilli growing areas of Vijayapur and Bagalkote districts in Northern Karnataka revealed that, Thrips parvispinus (Karny) was the dominant species among thrips infesting chilli. Thrips infestation commenced from July, peaking in October and November and persisted until March month. The highest thrips population was recorded in Jamkhandi taluka (Bagalkote) and the lowest in Basawana Bagewadi taluka (Vijayapura). Correlation analysis showed weak and insignificant effects of weather conditions on thrips populations in both districts. Predators such as minute pirate bugs, ladybird beetles, green lacewings, and spiders were observed with populations of 2.39, 1.83, 1.56, 0.67 and 1.78 per plant, respectively. Life cycle composed of egg, two nymphal instars, prepupa, pupa and adult stages. Developmental duration of egg, first and second instar larva, prepupa and pupa were 4.42±0.43, 1.74±0.28, 3.75±0.44, 1.16±0.26 and 2.09±0.25 days, respectively. Adult female laid on an average of 51.65±7.52 eggs and lived for 8.46±1.06 days. Longevity of adult male was 6.51±0.71 days. The pre-oviposition period, oviposition period and post-oviposition period lasted for 1.67±0.39, 4.19±0.46 and 2.55±0.23 days, respectively. Total life cycle of adult male and female were 19.94±1.67 and 21.89±1.69 days, respectively. Among the different insecticides and biopesticides tested, diafenthiuron 50% WP @ 0.5 g/l was found to be effective in controlling thrips population and recorded highest yield of 9.47 t/ha. It was followed by thiamethoxam 25% WG @ 0.25 g/l with yield of 7.95 t/ha. Among biopesticides, neem-based insecticide (1500 ppm) @ 5 ml/l and Beauvaria bassiana (2×108 CFU/g) @ 4 g/l were found equally effective in controlling thrips population with fruit yield of 4.55 and 4.17 t/ha, respectively.
650			_aEntomology
700			_aPrakash H. T.
942			_cTH _eM.Sc. (Agri) _h595.7 _kKIR _n0 _6595_700000000000000
999			_c70710 _d70710