四种杂交稻组合对白背飞虱种群消长的影响

THE EFFECTS OF FOUR HYBRID RICE COMBINATIONS ON THE POPULATION DENSITY OF WHITEBACKED PLANTHOPPER

利用不同抗性水平的杂交稻组合,对白背飞虱成虫的产卵节律、产卵量、卵孵化率、若虫历期、生存率、成虫性比、体重、蜜露排泄量、繁殖倍数及不同代别成虫产卵量等10项指标测定结果表明,协优46具有中抗水平,汕优6号、汕优63、汕优85等组合均属感虫,其中汕优85属中感水平。这些感虫的杂交稻组合各指标均大于常规稻感虫品种TN_1。说明近年来大面积种植感虫的杂交稻,如汕优6号、汕优63等,有利于白背飞虱的种群增长。

Several physiological indices of Sogatella furcifera(Horváth),namely,the oviposition rhythm,fecundity,sex ratio,body weight,anddaily honeydew excretion of adult,and duration and survival ofnymph,etc.,were tested on four hybrid rice combinations with differentresistances to this insect.The results showed that besides the modera-tely resistant Xieyou 46,the Shanyou 6,Shanyou 63,and Shanyou 85were all susceptible,in which Shanyou 85 was moderately susceptible.As compared with the susceptible common rice variety TN_1,all theindices of these susceptible hybrid rice combinations mentioned abovewere higher.It was suggested that the populization of susceptible hybridrice combinations such as Shanyou 6 and Shanyou 63 in recent yearsis favorable to the rampancy of WBPH.