普通肉食螨对9种储粮害虫的捕食能力研究

Predation Ability of Cheyletus Eruditus Schrank(Acari:Cheyletidae)on 9 Species of Stored Grain Insect Pests

研究了普通肉食螨（Cheyletus eruditusSchrank）幼螨、原若螨、后若螨、雌成螨4 种螨态对嗜卷书虱（Liposcelis bostrychophila Badonnel）、锈赤扁谷盗（Cryptolestes ferrugineus Stephens）等9 种常见储粮害虫的卵和1 龄幼虫（若虫）的捕食虫谱。研究发现，4 种螨态对9 种储粮害虫均有不同程度的捕食能力，普通肉食螨对嗜卷书虱的捕食能力较强，分别达3.3 粒/天d（卵）和2.4 头/d（1 龄若虫）。进一步探索普通肉食螨对嗜卷书虱的捕食功能反应，研究表明：在猎物密度为1～10 头（粒）范围内，原若螨、后若螨和雌成螨对嗜卷书虱卵的捕食量分别为：0.4～1.4、0.3～1.5、0.5～3.3 粒/d，对嗜卷书虱1 龄若虫的捕食量分别为0.1～0.6、0.2～1.2、0.4～2.4 头/d，原若螨、后若螨和雌成螨对嗜卷书虱卵和1 龄若虫的捕食功能均符合HollingⅡ型，攻击系数、捕食上限和捕食效能最高分别为0.515、8.485 和4.239 粒/d。

We evaluated predatation abilities of larvaes, protonymphs, deutonymphs and female adults of Cheyl- etus eruditus Schrank on the eggs and first - instar larvaes （or nymphs ） of 9 species of stored grain insect pests （SGIP）, including Liposcelis bostrychophila Badonnel, Cryptolestes ferrugineus Stephens. The results indicated that 4 stages of C. eruditus had unequal predation abilities on all tested pests, especially on L. bostrychophila, and it was 3.3 eggs and 2. 4 first - instar nymphs per day respectively. The functional response of C. erudituson L. bostrychophila was also researched. It showed that, with prey densities ranging from 1 to 10, protonymph, deu- tonymph and female adult of C. eruditusconsumed 0.4 - 1.4, 0.3 - 1.5, 0.5 - 3.3 eggs and 0. 1 ~ 0.6, 0.2 - 1.2, 0.4 - 2.4 first - instar nymphs of L. bostrychophila per day, respectively. Protonymphs, deutonymphs and female a- dults ofC. eruditus disaplayed Holling II functional responses on eggs and first - instar nymphs of L. bostrychophila. Attack rate, maximum prey consumption and predation efficiency were the highest at 0.515, 8. 485 and 4. 239 indi- vidual d - 1