PJB-2013-292
YIELD AND YIELD COMPONENTS OF WHEAT (TRITICUM AESTIVUM L.) AFFECTED BY APHID FEEDING AND SOWING TIME AT MULTAN, PAKISTAN
MUHAMMAD WASEEM SHAHZAD1, MUHAMMAD RAZAQ1*, ARJAD HUSSAIN1, MUHAMMAD YASEEN2, MUHAMMAD AFZAL3 AND MALIK KHALID MEHMOOD1
Abstract
We assessed feeding effect of Schizaphis graminum Rond. and Rhopalosiphum padi L. (Homoptera: Aphididae) on yield losses to wheat (Triticum aestivum L.) (Cv. Sahar) sown on November 05th (early November), November 20th (late November) and December 05th (early December) during 2011, at Multan, Punjab (Pakistan). Aphids were controlled by applying imidacloprid 200 SL with Knapsack sprayer, as one spray (5th March), two sprays (5th and 26th March 2012) and no spray (control). Aphid densities were recorded on weekly basis starting from 12th March. At harvest shoot biomass, number of grains per spike, thousand grain weight and yield were recorded. Polynomial orthogonal contrasts were employed for evaluation of sowing dates, insecticides and their interactions for spray treatments on yield and yield components. Aphid (S. graminum) was dominant over R. padi and its highest number was observed on March 26th
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