ROLE OF PHYSICAL PROPERTIES OF MAIZE GRAINS TOWARDS RESISTANCE TO SITOTROGA CEREALELLA (OLIV.) (GELECHIIDAE: LEPIDOPTERA) IN NO CHOICE TEST

Physical properties of maize grains were correlated with levels of the life history of sitotroga cerealella (oliv.) (gelechiidae: lepidoptera) in no choice test to find out relative resistance in different varieties. eight maize varieties /lines (ev-6089, sahiwal-2002, golden, 34n43, ev-1098, sultan, china-1, ev-20) including seven yellow and one white were obtained from maize and millet research institute, yousaf wala, sahiwal, punjab, pakistan. freshly laid eggs (one day old) of s. cerealella were obtained and cultured on a susceptible maize variety for two generations for later on shifting to test varieties. results showed that maximum moth emergence (10.33), fecundity (35.66), hatching (87.66%), moth weight (5.05 mg), development time (36.0 days) damage (93.35%) and grain weight loss (38.84%) was found in varieties, 34n43 and golden, sultan, sahiwal 2002, 34n43, ev-6089, 34n43 and ev-1089, respectively. varieties had significant difference with other varieties in these parameters (p<0.05). the varieties had positive as well as negative correlation between hardness index, grain weight and bulk density with the biological parameters of s. cerealella, percent grain damage and weight loss. possible involvement of these grain properties in the resistance of maize grains towards s. cerealella is discussed.