叶螨及两种替代食物对尼氏真绥螨发育和繁殖的影响

在温度25 ℃、相对湿度80％条件下，以油茶花粉、二斑叶螨和腐食酪螨3种食物饲喂尼氏真绥螨，研究不同食物对尼氏真绥螨生长发育和繁殖的影响.结果表明：尼氏真绥螨虽能取食腐食酪螨的卵，但因摄食量不足导致不能完成正常发育;而取食油茶花粉和二斑叶螨能正常完成发育，并进行繁殖.取食油茶花粉的尼氏真绥螨全世代发育历期、雌螨寿命、产卵历期、平均每雌总产卵量分别为6.18 d、24.97 d、16.72 d和23.03粒，取食二斑叶螨的尼氏真绥螨分别为5.67 d、25.72 d、18.17 d和25.38粒;以二斑叶螨为食的尼氏真绥螨发育快，寿命和产卵历期长，平均每雌产卵量高.以油茶花粉和二斑叶螨为食的尼氏真绥螨实验种群数量动态均呈上升趋势，其中以油茶花粉饲养的种群趋势指数最高（I=14.28），以二斑叶螨饲养的种群加倍时间最短（t=3.5201 d）.

Effects of spider mite and two substitute diets on the development and reproduction of Euseius nicholsi (Ehara et Lee) (Acari: Phytoseiidae)

Three kinds of diets, i.e., two-spotted spider mite Tetranychus urticae Koch, Camellia oleifera Abel pollen, and mould mite Tyrophagus putrescentiae (Schrank), were used to feed Euseius nicholsi (Ehara et Lee) in laboratory at 25 ℃ and 80% RH to study the effects of these diets on the development and reproduction of E. nicholsi. The E. nicholsi could prey on T. putrescentiae egg, but could not complete its natural development due to the deficiency of the egg. Other two diets were the favorable foods for the normal growth and reproduction of E. nicholsi. The life cycle duration, longevity, oviposition duration, and average lifetime fecundity of the adult female E. nicholsi fed with C. oleifera pollen and T. urticae were 6.18 d, 24.79 d, 16.72 d and 23.03, and 5.67 d, 25.72 d 18.17 d and 25.38, respectively. The quantity of the experimental E. nicholsi populations fed with these two diets all showed an increasing trend, with the population tendency index being the highest (I=14.28) for the population fed with C. oleifera pollen and the double population time being the shortest (t=3.5201 days) for the population fed with T. urticae.