Mo Tie-Lu, Liu Tong-Xian
Department of Entomology, College of Plant Protection, Shandong Agricultural University, Taian, Shandong 271018, China.
Environ Entomol. 2007 Apr;36(2):369-75. doi: 10.1603/0046-225x(2007)36[369:paltof]2.0.co;2.
Feltiella acarisuga (Vallot) is a common gall midge that feeds on many species of spider mites. Predation and all major biological and life table parameters of F. acarisuga were determined using eggs of the twospotted spider mite, Tetranychus urticae (Koch), as prey under laboratory conditions (26.7 degrees C, 85% RH, and 14:10 [L:D] h). First-, second-, and third-instar F. acarisuga larvae consumed an average of 37.8, 60.4, and 87.2 T. urticae eggs per day, respectively. Larvae consumed a total of 185.4 eggs each from first to third instars, and female larvae consumed 201.2 spider mite eggs, 18.6% more than male larvae. Developmental time of F. acarisuga was 2.6, 7.8, and 7.0 d for eggs, larvae, and pupae, respectively, with an average of 17.4 d from oviposition to adult emergence. Female immatures developed slightly slower ( approximately 1 d) than males. Adult longevities of F. acarisuga averaged 13.0 d. After an average of 1.1-d preoviposition period, each female laid an average of 33.3 eggs during her lifespan. The intrinsic rate of natural population increase (r), net reproductive rates (R(o)), gross reproductive rate (Sigmam(x)), generation time (T), doubling time (DT), and the finite rate of increase (lambda) of F. acarisuga were estimated by life table analysis at 0.1155/d, 15.25 eggs per female, 21.69 eggs per female, 23.6 d, 6.0 d, and 1.1225/d, respectively. Because the r value of F. acarisuga is relatively lower than that of T. urticae, frequent release of F. acarisuga may be necessary to suppress populations of T. urticae.
智利小植绥螨（Vallot）是一种常见的瘿蚊，以多种叶螨为食。在实验室条件（26.7摄氏度、85%相对湿度、14:10[光照:黑暗]小时）下，以二斑叶螨（Tetranychus urticae Koch）的卵为猎物，测定了智利小植绥螨的捕食情况以及所有主要生物学和生命表参数。智利小植绥螨一龄、二龄和三龄幼虫每天分别平均消耗37.8、60.4和87.2个二斑叶螨卵。幼虫从一龄到三龄共消耗185.4个卵，雌性幼虫消耗201.2个叶螨卵，比雄性幼虫多18.6%。智利小植绥螨卵、幼虫和蛹的发育时间分别为2.6、7.8和7.0天，从产卵到成虫羽化平均为17.4天。雌性未成熟个体发育比雄性略慢（约1天）。智利小植绥螨成虫平均寿命为13.0天。平均1.1天的产卵前期后，每只雌性在其寿命期间平均产卵33.3个。通过生命表分析估计，智利小植绥螨的自然种群内禀增长率（r）、净生殖率（R₀）、总生殖率（Σmx）、世代时间（T）、加倍时间（DT）和有限增长率（λ）分别为0.1155/天、每只雌性15.25个卵、每只雌性21.69个卵、23.6天、6.0天和1.1225/天。由于智利小植绥螨的r值相对低于二斑叶螨，可能需要频繁释放智利小植绥螨来抑制二斑叶螨种群。
