柑桔全爪螨在不同寄主植物上的 分布及繁殖力研究

在田间调查砂糖桔、甜橙、沙田柚和香柠檬4 种寄主植物不同部位柑桔全爪螨(Panonychus citri Me Gregor)的种群数量，并通过室内饲养比较柑桔全爪螨在以上4 种寄主植物上的繁殖力。结果表明院砂糖桔、甜橙、沙 田柚以及香柠檬4 种植株上部叶片柑桔全爪螨的种群数量多于中、下部叶片；砂糖桔、香柠檬上柑桔全爪螨的平均 数量相当(分别为12.02、12.07 头/叶），均显著多于甜橙和沙田柚，沙田柚上数量最少，仅为4.69 头/叶。1~3 代柑桔全 爪螨在砂糖桔、甜橙、沙田柚以及香柠檬上的平均产卵量均相当，单雌日产卵量为3~7 粒；4 种寄主植物上柑桔全爪 螨的卵历期及卵的孵化率均存在一定差异，卵的历期为5~8 d，孵化率为90%~98%。

Study on distribution and fecundity of Panonychus citri Me Gregor on different host plants

The population quantity of Panonychus citri Me Gregor in different position of shatangju tangerine, sweet orange, shatian pomelo and bergamot was investigated in field, and the fencundity of it on the four host plants was compared in laboratory. The result showed that the population quantity on apical leaves of the four host plants was more than those on middle and basal leaves. There was no significant difference between the average number of P. citri Me Gregor in shatangju tangerine and bergamot (12.02/leaf and 12.07/leaf, respectively), and the numbers of spider mite in sweet orange and shatian pomelo were significantly lower, which in shatian pomelo was the least (only 4.69/leaf). There was no significant difference among the average egg quantity of P. citri Me Gregor on the four host plants from one to three generations, and the average number of eggs laid per female spider mite in one day was 3 to 7 particles. The spider mite feeding on four host plants had different duration (5 to 8 days ) and hatchability (90% to 98%) of egg.