Bio-ecology and Management of Diamondback Moth, Plutella xylostella (L.) in Cabbage (Brassica oleracea var. capitata L.)
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Date
2021
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MPUAT, Udaipur
Abstract
Investigations on “Bio-ecology and Management of Diamondback Moth, Plutella xylostella (L.) in Cabbage (Brassica oleracea var. capitata L.)” was carried out at Horticulture Farm, Rajasthan College of Agriculture, Udaipur during Rabi, 2019-20 and 2020-21 and the laboratory work was done in the Department of Entomology, Department of Molecular Biology and Biotechnology, Rajasthan College of Agriculture, Udaipur and in the Molecular Genetics Faculty of Aquaculture Research unit, DOR, MPUAT, Udaipur.
During both seasons, a markedly high population of diamondback moth larvae was recorded as 9.18 larvae/ plant during the 2nd week of March, 2020 and 10.15 larvae/plant during the 3rd week of March, 2021, respectively. Similarly, the peak populations of diamondback moth pupae were noticed during the 4th week of February (6.45 pupae/ plant) and the 1st week of March (7.08 pupae/ plant). DBM larval and pupal populations had a significant positive correlation with maximum atmospheric temperature and sunshine hours while a significant negative correlation was observed with mean relative humidity during both years.
The aphidophagus natural enemies viz., coccinellids and syrphids were observed on cabbage during both the years. The peak population of coccinellids (1.13 and 1.35 adults/plant) were recorded during the 4th week of February and the 3rd week of February, respectively in both the years that correlated positively non-significant with mean temperature and positively significant with sunshine, while significant negative with relative humidity. Similarly, the monitoring on syrphid maggots’ populations showed that the peak activity of syrphids was during the 4th week of February (1.25 maggots/plant) and the 1st week of March (1.88 maggots/plant), respectively, during the respective seasons and positively significant with sunshine, while significant negative with relative humidity. The spatial distribution parameters revealed that diamondback moth larval observations exhibited the clumped type of distribution on cabbage during the Rabi season, 2019-20 and 2020-21.
Direct sequencing of mitochondrial DNA COI gene region was employed to find the genetic variation in Plutella xylostella population from different geographical locations in India and observations from the present results from the analysis of mtCOI sequences of P. xylostella point to the genetic variation among the Indian population. During both years, cabbage intercropped with marigold plus insecticides spray proved to be the best treatment with the lowest mean larval population and highest benefit cost ratio. Cabbage intercropped with onion and garlic plus insecticides sprays proved the next best crop combination in lowering the incidence DBM, respectively. Additionally, the intercrops treatments viz., Cabbage + Marigold, Cabbage + Onion and Cabbage + Garlic also significantly reduced the number of larvae per plant as compared to the sole cabbage
Description
Bio-ecology and Management of Diamondback Moth Cabbage
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Citation
Sharma K. And Mahla M.K.