Effect of Sowing Dates on the Incidence of Stem Borer (Chilo partellus Swinhoe) and Yield of Sorghum
DOI:
https://doi.org/10.53555/jaz.v42i01.5373Keywords:
Sorghum, Chilo partellus, stem borer, sowing date, dead hearts, pest incidence, crop yieldAbstract
Sorghum is a valuable cereal and fodder crop that is extensively grown in the semi arid parts of India. The stem borer (Chilo partellus Swinhoe) is one of the most devastating insect pests of sorghum that can result in massive losses of yields, through the formation of dead hearts, and undermined growth of plants. The current study was carried out in the farmer’s Agricultural Farm, Chandan Nagar, Hisar, Haryana in the period of 2015-17 with the aim to determine the effect of varying sowing dates on the occurrence of stem borer among sorghum variety HC 308. There were 4 dates of sowing, viz. 10th June, 25th June, 10th July and 25th July, which were considered in a Randomized Block Design with five replication. Incidences of pests were observed at 10 days interval after DAS (10 days after sowing) up to the maturity of crops. It was found out that early sowing had a significant effect on the infestation of the stem borers and yield. The lowest degree of infestation was recorded (1.31) on the crop sown on 10th June and the highest infestation (66.52) on the crop sown on 25th July at 110 DAS. The infestation was inversely related to the grain yield with the highest yield (10.88 q ha⁻1) being obtained at the 10th June sowing and the lowest yield (2.95 q ha⁻1) being obtained at the 25th July sowing. The results suggest that an early sowing in June is a good cultural practice in reducing the effects of the stem borer and maximizing the yield of sorghum.
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