Chamuene António, Araújo Tamíris Alves, Silva Gerson, Costa Thiago Leandro, Berger Paulo Geraldo, Picanço Marcelo Coutinho
Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
Departamento de Fitotecnia, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
Environ Entomol. 2018 Apr 5;47(2):440-447. doi: 10.1093/ee/nvx205.
Natural mortality factors are responsible for regulating pest populations in the field. However, plant attributes such as the variety and phenological stage can influence the performance of these factors. Therefore, we investigated the performance of the natural mortality factors of Aphis gossypii (Glover; Hemiptera: Aphididae) as a function of the plant variety and phenology. To investigate the performance of these factors, we evaluated the mortality of A. gossypii caused by natural mortality factors for 2 yr in field conditions in transgenic (Bacillus thuringiensis/Roundup Ready) and non-transgenic cotton crops during vegetative, flowering, and fruiting stages. The natural mortality factors were affected similarly between the transgenic and non-transgenic plants; however, differences were observed in their performance, depending on the phenological stage of the cotton plant. Compared with other stages, predation was higher in the flowering stage, whereas the mortality caused by rainfall was higher in the vegetative stage. Coccinellid beetles were primarily responsible for the predation on A. gossypii. These findings highlight that the performance of the natural mortality factors of A. gossypii varied more as a function of the phenological stage of cotton than of the variety.
自然死亡因素负责调节田间害虫种群数量。然而，诸如品种和物候期等植物特性会影响这些因素的作用效果。因此，我们研究了棉蚜（格氏棉蚜；半翅目：蚜科）自然死亡因素的作用效果与植物品种和物候的关系。为了研究这些因素的作用效果，我们在转基因（转苏云金芽孢杆菌基因/抗草甘膦）和非转基因棉花作物的田间条件下，于营养期、花期和结果期对自然死亡因素导致的棉蚜死亡率进行了为期2年的评估。转基因植物和非转基因植物的自然死亡因素受到的影响相似；然而，根据棉花植株的物候期，其作用效果存在差异。与其他阶段相比，花期的捕食率更高，而营养期因降雨导致的死亡率更高。瓢虫是捕食棉蚜的主要责任者。这些发现表明，棉蚜自然死亡因素的作用效果随棉花物候期的变化比随品种的变化更大。
