Investigation on Antixenosis Mechanism of Resistance to Early Shoot Borer, Chilo Infuscatellus Snellen in Sugarcane

摘要

In vivo experiment was conducted to screen 56 genotypes for resistance to early shoot borer, Chilo infuscatellus Snellen at Zonal Agricultural Research Station, V.C farm, Mandya during 2014-2015. Among the 56 genotypes, 47 genotypes were found less susceptible, while nine genotypes were found moderately susceptible to early shoot borer. Among these 16 genotypes, 009-64(3.44%), 10-65-01(5.59%), 10-65-01(3.83%), 10-17-08(4.97%), 10-57-0 (12.65%), 07-10- 02(10.57%), 10-28-02(10.03%), 09-61-02(14.85%), 10-17-05(15.39%), 07-06-05(16.48%), 10-33 33(17.75%), 10-38- 06(29.86%), 08-15-06(25.88), 06-09-03(27.45) and checks CoVC 99463(4.83%) and Co 8603 (22.39%) were selected to find out the antixenosis mechanism associated with them. Correlation studies on the morphological characters of different genotypes on ESB incidence revealed that the ESB incidence was highly influenced by leaf angle, leaf sheath thickness and shoot girth. Among the morphological parameters, leaf angle showed positive correlation (r= 0.819) with ESB incidence. Whereas leaf sheath thickness (r= -0.674) and shoot girth (r= -0.541) had negative correlation with ESB infestation in different genotypes. Correlation studies revealed no relationship between number of leaves, length of leaf, breadth of leaf, plant height and per cent incidence with ESB.