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EVALUATION FOR RESISTANCE TO APHIDS OF WHEAT GERMPLASM RESOURCES IN CHINA H.B. ZHOU 1,2 J.L. CHEN 1 F. FRANCIS 2 D.F. CHENG 1 Y. LIU 3 J.R. SUN 1. 1 Institute of Plant Protection, Chinese Academy of Agricultural Sciences (CAAS), West Yuan-ming-yuan Road 2, 100193 Beijing, China

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  1. EVALUATION FOR RESISTANCE TO APHIDS OF WHEAT GERMPLASM RESOURCES IN CHINA H.B. ZHOU1,2J.L. CHEN1F. FRANCIS2 D.F. CHENG1 Y. LIU3 J.R. SUN1 1 Institute of Plant Protection, Chinese Academy of Agricultural Sciences (CAAS), West Yuan-ming-yuan Road 2, 100193 Beijing, China 2 Department of Functional and Evolutionary Entomology, University of Liege, Gembloux Agro-Bio Tech, Passage des Déportés 2, 5030 Gembloux, Belgium 3 Shandong Agricultural University, Taian, PR China. Foreword To avoid environmental pollution and health problems caused by the overuse of traditional synthetic pesticides, exploration of host plant resistance to pest management is an important research theme in sustainable agriculture system. Whereas host plant resistance plays important roles in controlling pests and protecting of natural enemies in an agroecosystem, and the effect of insect resistant varieties in reducing damage is conspicuous. Experimentations & Results Fuzzy recognition technique evaluation were used to determine sources of resistance in wheat to populations of the wheat aphids in five field experiments over 2 years in wheat-producing areas of China. Results showed that the majority of wheat varieties identified were susceptible to aphids, and no immune and highly resistant variety was observed. The mean percentage from the wheat varieties with resistant, lowly susceptible, moderately susceptible and highly susceptible to aphid were 9.30%, 23.15%, 42.32%, and 25.23% in whole wheat varieties respectively. 5 wheat varieties (Lantian18, Lantian20, Lantian22, Lantian00-30 and Shanmai175) were moderately resistant in Jiangyou in 2009, other resistant sources were low levels for aphid-resistant. And more importantly, 2 wheat varieties (Lantian20, Lantian22) with the continuous resistance to wheat aphid in the five experimental fields over 2 years were found. Although resistance of wheat varieties had a close relation to their genetics and inheritance, we also found that the evaluation results of the same wheat varieties were varied in different place. Discussion and conclusion It would be helpful to make germplasm selections for breeding programs, especially if they have unique genes that may provide resistance to future biotypes of wheat aphids. A valuable tool for evaluating the potential of aphid- resistance for wheat varieties was also proved.

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