Field incidence of and host resistance to Angoumois grain moth (AGM)
1988
Ragumoorthy, K.N. | Gunathilagaraj, K. (Tamil Nadu Agricultural Univ., Madurai (India). Agricultural Entomology Dept.)
Field incidence of AGM Sitotroga cerealella O. on rice was surveyed at the Agricultural College in Madurai and the Tamil Nadu Rice Research Institute in Aduthurai [India]. Seed samples of 100g for each variety were collected in polythene bags and adult moth emergence monitored for 6 wk. AGM emerged from 124 of 213 samples at Madurai and from 59 of 151 samples at Aduthurai. Incidence was highest in IR and CO varieties; IR20, IR50, IR54, IR64, CO25, CO31, CO37, CO42, CO43, CO44, ACM11, ACM12, IET7254, ADT36, AD85003, NLR 9672, Ponni, TNAU801790, TNAU831293, TNAU831520, and TNAU831521 showed field infestation in both places. Thirty eight (38) CO varieties were evaluated for resistance on the basis of number of moths emerging, percentage infested grains, weight loss, and weight of adult moths; 15 were resistant. Resistant CO 1, CO 27, and CO 32; moderately resistant CO 40; moderately susceptible CO 42; and highly susceptible CO 43 and CO 44 were selected to study factors conferring resistance. Husk thickness, grain hardness (alkali value), length-breadth ratio (grain fineness), 100-grain weight, and silica, protein, and amylose content were analyzed. In general, resistant varieties had thick husk, low alkali value, coarse grain, higher 100-grain weight, and high silica, total protein, and total amylose content.
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