Abstract: In order to explore the physiologic race type and the parasitism on tobacco of Jimo and Juxian populations of Heterodera glycines (SCN),the cup trial with quantitative inoculation was adopted,and the reproduction and infection performances were detected for the two populations on five soybean cultivars (including four host differentials and one susceptible standard cultivar Lee) and six tobacco ones.The results showed that the reproduction factor (Rf=P_f/P_i) of SCN Jimo population was 1.88(0.05-9.03) on the five soybean cultivars,with the Rf of 9.03 on the susceptible standard cultivar Lee,and the Rf was 0.01(0.00-0.04) on the six tobacco cultivars.The Rf of SCN Juxian population was 1.23(0.05-5.28) on the five soybean cultivars,with the Rf of 5.28 on the susceptible standard cultivar Lee,and the Rf was 0.16(0.00-0.65) on the six tobacco cultivars.The results indicated that the Jimo and Juxian populations of SCN were the physiologic race No.3 and No.6,respectively,both of which were found for the first time in Shandong Province.The SCN Jimo population had almost no parasitism on the six tobacco cultivars,and the Juxian population had certain parasitism on some tobacco cultivars such as Yunyan 85 and NC95.

Key words: Heterodera glycines, Physiologic race, Nicotiana tobacum, Reproduction factor, Parasitism

CLC Number: 

• S435.651