SCREENING OF WHEAT VARIETIES/ADVANCED LINES AGAINST APHIDS

Study was conducted to screen 28 wheat, triticum aestivum (l.) varieties/advanced lines based on population density of aphids in punjab, pakistan during 2002-2003 in the experimental areas of wheat research institute, faisalabad. the genotypes differed significantly in response to the population of aphids per tiller and these genotypes categorized in order of susceptibility are iqbal-2000 (8.06), d-98627 (7.21), as-2002 (6.65), v- 99074 (6.62), 97b2210 (6.60), v-99176 (6.50), parwaz (6.41), v-99119 (6.19), v-00183 (5.95), v-99022 (5.80), v-99160 (5.60), v-99068 (5.48), mh-97 (5.26), pasban (5.17), v-02166 (5.01), v-98044 (5.00), uqab- 2000 (4.93), pak-81 (4.87), v-99161 (4.81), v-99044 (4.73), v-98059 (4.55), chenab-2000 (4.55), v-99134 (4.53), punjab-96 (4.47), v-02156 (4.08), rohtas (4.02), v-99099 (3.02) and v-00146 (2.91). the peak population of aphids was observed during third week of march 2003.