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| | Study on Soybean Resistance to Aphid |
 | | Guoyu 98-4, Guoyu 100-4, Zhe 455, Xiongyue yellow small grain, Liao 81-5052, 8433, Tie 79163-5, Wenfeng 5, Liao 84-5018, Liaodou 3, Amsoy, Tiefeng 20, Liao 83-5020, Tiefeng 24, Shen 702 and Jilin 3. |
 | | In 1989, the year of aphid outbreak, the average aphid number per plant was 97.4 on resistant varieties (Guoyu 98-4 and Guoyu 100-4) while 640.4 on susceptible varieties (Amsoy, Tiefemg 20 and Wenfeng 5) at the stage of flower bud differentiation on June 20,which was 6.6 times higher than on the resistant ones. |
 | | At present, agronomic characteristics of some identified resistant varieties, such as Guoyu 98-4 and Guoyu 100-4, are inferior and difficult to use directly since some bad characteristics may be obtained in the course of the resistance transfer. |
| www.ksu.edu /issa/aphids/reporthtml/trans18.htm (1792 words) |
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