Epidemiology and Management of Alternaria Blight of Radish
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Date
2021-11
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
Radish (Raphanus sativus) is one of the most important root crops of the family Brassicaceae. One of the most destructive diseases that causes widespread losses in radish is Alternaria blight. A set of investigations were conducted during Rabi season of 2020-21 regarding the epidemiology and management of Alternaria blight of radish. An extensive survey of radish fields was conducted and the data revealed that disease was prevalent at all the locations surveyed and varied from 22.66 and 28.08 per cent respectively. Weather parameters revealed that temperature, both maximum and minimum, exhibited a highly significant and positive correlation with disease intensity, while relative humidity (maximum and minimum) showed a significant and negative impact, whereas rainfall had no significant effect on disease development. Under field conditions, eighteen radish germplasm/genotypes were screened against Alternariablight disease and it was observed that no germplasm/genotype was found immune However, Kitchen Garden and AZ-88 were found resistant.White Star, Mahy 22, Mino early, White Mosaic, Gennext F1Hybrid, Durga, CR-45 and Mino Early Long White were moderately resistant. Supriya, Sangeeta, Korean Cross, Radish White Marble, Mino Early and Winter- 45 were susceptible while, Chinese Pink and Long White showed a highly susceptible reaction against the disease. The bioassay of eight fungicides was done in vitro conditions by using poisoned food technique with concentrations of 100, 250, 500 and 750 ppm against Alternaria brassicicola and all fungicides significantly inhibited growth of the pathogen even at the lowest concentrations. Tebuconazole wasmost effective in inhibiting the mycelial growth at all concentrations (100, 250, 500 and 750 ppm), while Azoxystrobin was found least effective. Under field conditions, Tebuconazole was found most effective while Copper oxychloride was found least effective in controlling Alternaria blight.
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Preferred for your work_____loona, diksha.2021. Epidemiology and Management of Alternaria blight of radish. Thesis submitted to SKUAST-JAMMU