Field Screening of Sorghum Genotypes for Resistance to Shoot Fly, Atherigonasoccata and Stem Borer, Chilopartellus
Sorghum [Sorghum bicolor(L.) Moench] locally known as Jowar is the fifth most important cereal crop in the world after wheat, rice, maize and barley. In India it has positioned third after rice and wheat. Among the biotic factors about 150 insect pests have been reported in different agro ecosystem of sorghum crop. Out of them sorghum shoot fly, AtherigonasoccataRondani (Diptera: Muscidae) and stem borer, ChilopartellusSwinhoe (Lepidoptera: Pyralidae) are the major insect pests which severely devastate to sorghum crop. Shoot fly is the most destructive one and causes severe damage in the early seedling stage at 7-30 days after seedling emergence. The present investigation was conducted on screening with nineteen advanced breeding lines of sorghum in randomized block design (RBD) with three replications against the shoot fly and stem borer during rabi season at Regional Agricultural Research Station, Vijayapur, Karnataka, India. Results on shoot fly revealed that the highly susceptible genotype was reported to SPH 1864 (36.9eggs/ 5 plants and 9.3% dead heart). Whereas, genotypes SPH 1899 and CSV 22 were found to be resistant with significantly minimum number of eggs (14.7/ 5 plants) and dead heart (6.7%). During the investigation, stem borer incidence was negligible with maximum in SPH 1864 genotype (4.8%) and minimum dead heart per cent caused by stem borer was genotype SPH 1898 (2.3%).
Keywords - Screening, Sorghum, Shoot Fly, Stem Borer