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Estimation of avoidable losses due to shootfly and stem borer in new sorghum cultivars

Estimation of avoidable losses due to shootfly and stem borer in new sorghum cultivars

Indian Journal of Entomology 52(4): 595-609

The avoidable losses due to shootfly and stem borer damage were worked out by comparing grain and fodder yield of recently released sorghum cultivars viz., CSH 9, CSV 10 and GJ 35 alongwith old cultivars viz., CSH 1 and CSV 1 under treated and untreated conditions at the farm area of Indian Agricultural Research Institute, New Delhi [India] during 1987 and 1988. The crop was sown during first week of July in paired plot method adopting randomised block design. Out of eight rows of each plot in a replication, four rows were treated by applying carbofuran granules in seed furrows at the rate of 1.5 g per m row against shootfly and leaf whorl application at the rate of 8 and 10 kg per ha 25 and 35 days after germination to protect the crop against stem borer. Observations on dead hearts due to shootfly and dead heart, leaf injury and stem tunnelling caused by stem borer were recorded separately in treated and untreated plots under natural infestation conditions.

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