Varietal resistance/susceptibility of wheat to aphids, Sitobion avenae F. and Rhopalosiphum rufiabdominalis Sasaki
1993
Aheer, G.M. (Ayub Agricultural Research Inst., Faisalabad (Pakistan). Entomology Section) | Rashid, A. | Afzal, M. (Punjab Agricultural Research Inst., Bahawalpur (Pakistan)) | Ali, A.
Thirteen wheat varieties/advance lines i.e. Kohinoor-83, Pak81, Punjab81, Sutlej86, V6236, V6300, V6521, V6550, V6566, V6632, V6751, V6916 and V7061 were tested during 1988-89 to determine loss in grain yield caused by aphids (Sitobion avenae F. and Rhopalosiphum rufiabdominalis Sasaki). The experiment was sown in two sets viz. sprayed and unsprayed. Perfekthion (dimethoate) at the rate of 741 ml/ha was sprayed in one set for four times at 10 days interval starting from February 18, 1989. Wheat lines differed significantly in response to aphid population and grain yield. There was no effect on grain yield. On an average, 7.19 aphids per tiller reduced 16.38% yield. Kohinoor83 was relatively susceptible with 22.53% grain yield loss. Whereas, V7061 was resistant with 10.76% yield loss. Correlation between grain yield loss and number of aphids causing yield loss was significant and negative. Wheat lines behaved differently with regard to aphid population and loss in grain yield.
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