圆果大赤螨的初步研究

PRELIMINARY STUDIES ON ANYSTIS BACCARUM (LINNAEUS) (ACARI: ANYSTIDAE)

圆果大赤螨一生的发育经卵、前幼螨、幼螨、第一、二、三若螨和成螨7个阶段,在幼螨和各若螨的后期都有一个静息期.成螨能进行孤雌生殖,死后的遗腹卵也能孵化.该螨在广州地区年发生2～3代,盛发期分别在3～4月、10～11月和12～1月.冬季继续发育,没有越冬现象,但在夏季旬平均气温超过28℃时发育停止.该螨除捕食蚜虫、蚧壳虫和叶螨外,还捕食柑桔木虱和柑桔锈螨.对桔全爪螨.柑桔锈螨、柑桔木虱和绣线菊蚜等有害生物每天的捕食量分别为34.3头、52.0头、15.1头和16.0头.

In Anystis baccarum (Linnnaeus) 7 development stages such as egg, prelarva, larva, protonymph. deutonymph. tritonymph and adult were observed. There was. a quiescent stage during the last development period of larva and any anymph stages. Parthenogenesis occurred generally and the eggs which were left in the dead body of mite could be hatching. In Guangzhou city there were 2-3 generations in a year. One generation took 99.5 days on average under the temperature of 21℃. No diapause was found in the winter, but a aestivation appeared in summer when the temperature increased to obove 28℃. The population fluctuation had 3 peaks in a year, in March to April, October to November and December to January respectively. This mite caught some pests effectively such as Diaphorina citri and phyllocoptruta oleivora.