Basis of host plant resistance to early shoot borer, Chilo infuscatellus in sugarcane
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Keywords:Early shoot borer, Chilo infuscatellus, sugarcane germplasm, field screening, basis for resistance, morphological parameters
Field screening of different sugarcane genotypes against early shoot borer (Chilo infuscatellus Snellen) at RegionalÂ Agricultural Research Station, Anakapalle during 2008-2010 revealed that the genotypes viz., Co 0110 (8.5 %),Â 98 A 165 (9.9 % ), Co 6806 (9.6 %) and 98 A 125 (8.0%) recorded less than 15 per cent dead hearts and wereÂ graded as least susceptible while the genotypes 97 A 85 (22.5 %), 2000 A 105 (24.3 %), 99 A 5 (24.2 %) and C0Â 62175 (26.3 %) recorded 15 to 30 per cent and were graded as moderately susceptible genotypes (MS). TheÂ genotypes 93A 11 (31.9 %), 99 A 33 (37.5%), 94 A 124 (35.0 %) and Co M 9902 (41.8 %) recorded more than 30Â per cent and were graded as highly susceptible (HS) whereas, the susceptible check, 93 A 145 had recorded 39.2Â per cent incidence (DH)of early shoot borer (ESB) at 60 days after planting. Studies on influence of morphologicalÂ parameters of different genotypes such as leaf sheath thickness, shoot girth, number of leaves, leaf length, breadthÂ of leaf on ESB incidence revealed that the incidence was highly influenced by leaf sheath thickness and shootÂ girth. Leaf sheath thickness had negative correlation (r= -0.89) whereas shoot girth had positive correlation (r =Â 0.94) with ESB infestation in different sugarcane genotypes. Among the morphological parameters, leaf inclinationÂ showed positive correlation (r =0.8) with ovipositional preference of ESB moth on different genotypes. The mothsÂ preferred deep green foliage as well as bent and drooping leaves for egg laying and preferred to lay eggs on theÂ lower surface of leaves.
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