摘要
毒力测定结果显示 ,虽然褐飞虱NilaparvatalugensSt l田间品系对吡虫啉还没有表现出明显的抗性 ,但室内筛选品系已经出现了一定水平的抗性 ,抗性品系 1 (R1)和抗性品系 2 (R2 )的抗性倍数分别为 2 5 3 8和 68 92。通过建立抗性品系、田间种群和敏感品系的生命表 ,发现抗性品系适合度显著下降 ,而且R2 品系下降的幅度明显大于R1品系。存在显著变化的因素有低龄若虫存活率、成虫羽化率、交配率、产卵量和孵化率下降 ,雌虫寿命缩短 ;R2 品系还表现为卵历期延长 ,3龄若虫至 5龄若虫存活率下降。R2 品系产卵高峰期迟 ,高峰期日虫量显著低于敏感品系和田间种群。用种群数量趋势指数 (I)来确定抗性品系的相对生物适合度 ,发现与敏感性品系相比 ,R1品系和R2 品系的相对适合度分别为0 60 9和 0 2 45。
Although the resistance of BPH to imidacloprid was low in the field, high resistance has been observed in strains selected by imidacloprid. The effects of the imidacloprid resistance on the fitness of BPH were evaluated in terms of developmental and reproductive characteristics by constructing and comparing the life tables of the two resistant strains (R 1, R 2) with those of susceptible strains (S). The results revealed that both R 1 and R 2 strains had developmental disadvantages, including a lower larval survival rate from neonate to 2nd instar, a lower adult emergence rate and shorter female life-span, as well as reproductive disadvantages such as lower copulation rate, effective fecundity and hatchability. In addition, the R 2 strain had prolonged egg duration and a lower larval survival rate from the 3rd to 5th instar. The fastigium of R 2 was later than that of S and F 2, and the fecundity of the fastigium of R 2 was also lower than that of S and F 2. The fitness of the two resistant strains was determining by comparing the population number tendency index(I)with the susceptible strain as standard. The relative fitness value for the R-1 strain was calculated to be 0.609 and the R 2 strain was only 0.245.
出处
《昆虫知识》
CSCD
北大核心
2003年第5期419-422,共4页
Entomological Knowledge
基金
"973"国家重点基础研究项目 (J2 0 0 0 0 16 2 )
