Tuelher Edmar S, Silva Éder H, Hirose Edson, Guedes Raul Narciso C, Oliveira Eugênio E
Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
EMBRAPA Soybean, Londrina, PR, Brazil.
Pest Manag Sci. 2016 Oct;72(10):1837-43. doi: 10.1002/ps.4306. Epub 2016 May 31.
The abundance and contribution of the neotropical brown stink bug, Euschistus heros (F.), and the redbanded stink bug, Piezodorus guildinii (West.), to the composition of insect pests of soybean, Glycine max (L.), fields have changed both spatially and temporally in neotropical soybean production areas. Therefore, we assessed the competitiveness of each species in direct competition experiments following an additive series. We performed mixed (adult) insect infestations in soybean plants and evaluated the fitness of each species and the soybean yield.
While the competitive ability of E. heros was significantly compromised by increments in conspecifics and heterospecifics (i.e. P. guildinii), the competitive ability of P. guildinii was compromised by the presence of heterospecifics (i.e. E. heros). The reproductive output of P. guildinii remained unaffected by increments in E. heros or of P. guildinii. Intriguingly, despite the fact that P. guildinii apparently lost the competition with E. heros, almost no pod production was observed in any plant colonised by the former.
The higher abundance of E. heros in neotropical soybean fields seems to result from higher competitive ability than its heterospecific competitor P. guildinii, which may prevent the higher losses caused by P. guildinii. © 2016 Society of Chemical Industry.
在新热带地区大豆产区，新热带褐蝽Euschistus heros (F.)和红带蝽Piezodorus guildinii (West.)在大豆Glycine max (L.)田害虫组成中的数量及影响在时空上均发生了变化。因此，我们按照相加序列在直接竞争实验中评估了每个物种的竞争力。我们对大豆植株进行了混合（成虫）昆虫侵染，并评估了每个物种的适合度以及大豆产量。
虽然E. heros的竞争能力因同种个体和异种个体（即P. guildinii）数量的增加而显著受损，但P. guildinii的竞争能力因异种个体（即E. heros）的存在而受损。P. guildinii的繁殖产出不受E. heros或P. guildinii数量增加的影响。有趣的是，尽管P. guildinii显然在与E. heros的竞争中失败，但在任何被前者侵染的植株上几乎都未观察到结荚。
新热带地区大豆田中E. heros数量较多似乎是因为其竞争能力高于异种竞争者P. guildinii，这可能避免了由P. guildinii造成的更高损失。© 2016化学工业协会。
