迁人江淮稻区褐稻虱生物型跟踪监测及分析

该文对近年来褐稻虱迁入虫源的性质进行了探讨，结果表明迁入的虫源在鉴别品种Mudgo上的致害力，生存率、取食量和原始的种群生物型I没有明显的差别；两者在酯酶同工酶谱带数目和RF值也没有差异。迁入的虫源在田间抗性品种上明显表现虫量少。因此，迁入江淮稻区虫源仍是种群生物型I。人工在Mudgo上诱导产生的生物型1再回到感性品种上连续饲养8代，其对Mudgo的致害性降为1.O级，表明了褐稻虱生物型的不稳定性。

TRACK MONITORING OF THE BIOTYPE OF BROWN PLANTHOPPER (NILAPARVATA LUGENS) IMMIGRATING INTO RICE FIELD IN JIANG-HUAI REGION

The nature of the biotype of the brown planthopper (BPH) immigrating into rice field was recently studied. Results indicated that no obvious differences in virulence, rate of survival, honeydew excretion, zymograms of the esterase isozyme had been found between the immigrant populations and the primitive population of BPH on susceptible cultivar Nanjing 11. Therefore, the immigrant populations of BPH were still of biotype I in Jiang-Huai rice region, but their virulence to Mudgo had developed a lit tle bit. The virulence to Mudgo decreased down to scale 1.0 when the BPH biotype fed on susceptible varieties for 8 generations, showing its virulent unstability.