Carvalho Alessandra R, Bueno Vanda H P, Pedroso Elizabeth C, Kon Leonardo I, Diniz Alexandre J F, Silva Robson J
Lab. Controle Biológico, Depto. Entomologia, Univ. Federal de Lavras. Campus Universitáirio UFLA, Lavras, MG.
Neotrop Entomol. 2006 Jul-Aug;35(4):489-92. doi: 10.1590/s1519-566x2006000400010.
Several species of Orius Wolff are used in biological control of thrips in protected cultivations in temperate regions, but some of them show reproductive diapause, compromising the efficiency of these agents of biological control. There are no reports on the biology of the neotropical species Orius thyestes Herring under different environmental conditions. The purpose of this work was to investigate the influence of photoperiod on reproduction and longevity of this predator. Nymphs were kept in petri dishes in climatic chambers at 28+/-1 degree C, 70+/-10% RH and under the photoperiods of 12L:12D, 11L:13D, 10 L:14D e 09L:15D. The mating adults were kept in petri dishes with Bidens pilosa L. Asteraceae inflorescences as oviposition substracts and eggs of Anagasta kuehniella (Zeller) (Lepidoptera: Pyralidae) as food. The pre-oviposition and oviposition periods, fecundity and longevity were evaluated and O. thyestes did not show reprodutive diapause in all photoperiod conditions established. The mean number of eggs obtained per female decreased with the reduction of the photophase, with a difference (P < 0.05) between the values obtained in 12h and 9h of photophase. Longevity of females and males under 9h photophase was shorter (P < 0.05) than in all other photoperiods tested. The knowledge of the biology of the natural enemy under different conditions allows to optimise the mass rearing and to predict the performance of the predator in different photoperiods which may occur along the year and in greenhouses.
在温带地区的保护地栽培中，几种小花蝽属（Orius Wolff）昆虫被用于蓟马的生物防治，但其中一些表现出生殖滞育，影响了这些生物防治剂的效率。目前尚无关于新热带物种赫氏小花蝽（Orius thyestes Herring）在不同环境条件下生物学特性的报道。本研究的目的是探讨光周期对这种捕食性昆虫繁殖和寿命的影响。若虫饲养在培养皿中，置于气候箱内，温度为28±1℃，相对湿度为70±10%，光周期分别为12L:12D、11L:13D、10L:14D和09L:15D。将交配后的成虫饲养在培养皿中，以三叶鬼针草（Bidens pilosa L.，菊科）的花序作为产卵基质，以地中海粉螟（Anagasta kuehniella (Zeller)，鳞翅目：螟蛾科）的卵作为食物。对产卵前期、产卵期、繁殖力和寿命进行了评估，结果表明，在设定的所有光周期条件下，赫氏小花蝽均未表现出生殖滞育。随着光期的缩短，每只雌虫获得的平均卵数减少，光期为12小时和9小时时获得的值之间存在差异（P < 0.05）。光期为9小时时，雌虫和雄虫的寿命均短于（P < 0.05）所有其他测试光周期。了解天敌在不同条件下的生物学特性有助于优化大量饲养，并预测该捕食性昆虫在一年中以及温室中可能出现的不同光周期下的表现。
