Soglia Maria C M, Bueno Vanda H P, Sampaio Marcus V, Rodrigues Sandra M M, Ledo Carlos A S
Depto. Entomologia, Univ. Federal de Lavras, Lavras, MG, 37200-000.
Neotrop Entomol. 2006 May-Jun;35(3):364-70. doi: 10.1590/s1519-566x2006000300011.
The parasitoids Lysiphlebus testaceipes (Cresson) and Aphidius colemani Viereck play an important role on the regulation of aphid populations on chrysanthemum grown in greenhouses. This study evaluated the interaction of biological control and plant resistance by the development and the parasitism of L. testaceipes and A. colemani on Aphis gossypii Glover. The aphid host was kept on commercial cultivars of chrysanthemum susceptible Yellow Snowdon (YS) and resistant White Reagan (WR). The experiment was carried out in climatic chamber at 22 +/- 1 masculineC, 70 +/- 10% RH, and photophase 12h. Nymphs of 2nd and 3rd instars of A. gossypii attacked only once by the parasitoids were used in the experiment. The development time was 15.0 and 12.9 days for L. testaceipes and 17.0 and 16.3 days for A. colemani kept on A gossypii on cvs. YS and WR, respectively. The parasitoid L. testaceipes showed greater parasitism rate (68.4%) on A. gossypii on cv. YS than on WR (50%), and for A. colemani was not found significative difference on parasitism (46.8 and 35% to YS and WR, respectively). The emergence rates of L. testaceipes and A. colemani were 91.6% and 85.3% on A gossypii reared on YS, and 78.1% and 100% on WR, respectively. The longevity of A colemani and the parasitism rate of L. testaceipes were affected in a negative way by the cv. WR. The results indicated a positive interaction of biological control with parasitoids and the resistant cv. WR on A. gossypii control in protected cultivation.
寄生蜂黄足蚜小蜂（Lysiphlebus testaceipes (Cresson)）和棉蚜茧蜂（Aphidius colemani Viereck）在温室种植的菊花上蚜虫种群的调控中发挥着重要作用。本研究通过黄足蚜小蜂和棉蚜茧蜂对棉蚜（Aphis gossypii Glover）的发育和寄生情况，评估了生物防治与植物抗性之间的相互作用。将蚜虫寄主饲养在菊花商业品种易感的“黄斯诺登”（YS）和抗性的“白里根”（WR）上。实验在气候箱中进行，温度为22±1℃，相对湿度为70±10%，光周期为12小时。实验使用仅被寄生蜂攻击过一次的棉蚜二龄和三龄若虫。饲养在YS和WR品种棉蚜上的黄足蚜小蜂发育时间分别为15.0天和12.9天，棉蚜茧蜂分别为17.0天和16.3天。寄生蜂黄足蚜小蜂对YS品种棉蚜的寄生率（68.4%）高于WR品种（50%），而棉蚜茧蜂的寄生率在两者间未发现显著差异（分别为46.8%和35%）。饲养在YS上的棉蚜上，黄足蚜小蜂和棉蚜茧蜂的羽化率分别为91.6%和85.3%，在WR上分别为78.1%和100%。WR品种对棉蚜茧蜂的寿命和黄足蚜小蜂的寄生率有负面影响。结果表明在设施栽培中，生物防治与寄生蜂以及抗性品种WR对棉蚜防治存在积极的相互作用。
