PJB-2011-332
AN APPRAISAL OF RESISTANCE OF OLD AND NEW WHEAT GENOTYPES TO RED FLOUR BEETLE (TRIBOLIUM CASTANEUM HERBST)
M.S. KHANZADA1, G.H. ABRO1*, T.S. SYED1, S.R. KHANZADA1, KHALIL A. KHANZADA2, SHAHJAHAN1, S. D. KHANZADA3 AND AKHLAQ AHMED4
Abstract
In the present investigation, 30 varieties of wheat were used to study their resistance against Red flour beetle, Tribolium castaneum (Herbst).The grains of all these varieties were obtained from Plant Breeding and Genetics Division, Nuclear Institute of Agriculture, Tandojam. Experiment was conducted in the laboratory at 29±2oC and 65±5% R.H. The standard of the samples of each variety used in the experiment was 1000 grains, kept in plastic jars (15 x 6 cm). Ten pairs of newly emerged adult flour beetles (both sexes in equivalent numbers) of uniform age from laboratory stocked culture were released in each jar. The results were evaluated on the bases of adult population development, percent grain damage and frass production, revealed that none of the genotype was completely resistant to the infestation of T. castaneum. All the varieties suffered losses, but their degree of resistance varied significantly. On the bases of pest population development, percent damage and frass production, the least damage was noted in variety Barani-70 and Bhittai and the highest damage was recorded in T21 and T16; hence these varieties were designated the most tolerant and the most susceptible varieties, respectively. The comparative resistance displayed by the wheat varieties, could be placed in the following order :< Barani-70 < Bhittai
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