1 Institute of Plant Protection, Chinese Academy of Agricultural Sciences (CAAS), West Yuan-ming-yuan Road 2, 100193 Beijing, China2 Department of Functional and Evolutionary Entomology, University of Liege, Gembloux Agro-Bio Tech, Passage des Déportés 2, 5030 Gembloux, Belgium3 Shandong Agricultural University, Taian, PR China.

ForewordTo 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 & ResultsFuzzy 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 conclusionIt 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.

EVALUATION FOR RESISTANCE TO APHIDS OF WHEAT GERMPLASM RESOURCES IN CHINA

H.B. ZHOU1,2 J.L. CHEN1 F. FRANCIS2 D.F. CHENG1 Y. LIU3 J.R. SUN1