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- Title
Eco-climatic variation influencing thrips (Thrips tabaci l.) population dynamics of onion (Allium cepa l.).
- Authors
SINGH, G.; SAHA, G.; ROY, K.; SONIYA, M.; KARMAKAR, S.; KAR, B.
- Abstract
Thrips infestation may greatly affect productivity and marketability of onion bulbs. Effects of different weather variables on temporal dynamics of onion thrips (Thrips tabaci L.) population along with their direct effect on productivity were estimated during Kharif and Rabi season of 2015-16 at agricultural farm, BCKV, West Bengal. The experiment was consisted with four planting dates (14thAugust, 21stAugust, 28thAugust, 4thSeptember for kharif and 1stNovember, 8thNovember, 15thNovember, 22ndNovember for rabi season) along with three spacing schedules (15×10, 20×15 and 15×15cm) following randomized block design with three replications. Results revealed that maximum number of thrips were recorded under P1 (1st Nov.) at 68DAT (7.45 thrips/plant) followed by P4 (22nd November) at 61DAT (7.16 thrips/plant). Thrips population was also higher at 61DAT during rabi season under all stipulated spacing (range- 6.36 to 6.66 thrips/plant). Comparatively lower thrips infestation was noticed during kharif season. Thrips population dynamics were in increasing tendency from 40 to 61DAT followed by declining trend till 75DAT under different treatments. Significant relationships among thrips population and micro-climatic parameters like canopy temperature, canopy humidity, incident PAR and reflected PAR were documented during entire crop cycle for both the seasons. Some associations between thrips population and onion productivity have also been observed.
- Subjects
VEGETATION &; climate; ONION diseases &; pests; THRIPS; POPULATION dynamics; PLANT populations
- Publication
Journal of Agrometeorology, 2017, Vol 19, p278
- ISSN
0972-1665
- Publication type
Article