The aim of this work was to evaluate the influence of production systems involving the eucalyptus culture on infestation as well as the necessity of controlling its defoliator Glena unipennaria in order to qualify how sustainable integrated production systems are. Adult infestation was evaluated in the following systems: (1) eucalyptus monoculture, (2) agroforestry (grains integrated with eucalyptus), (3) silvopastoral (palisade grass integrated with eucalyptus) and (4) agrosilvopastoral (palisade grass cultivated after grains, both integrated with eucalyptus) production systems. Results showed that adult infestations in integrated systems are significantly lower and different from eucalyptus in monoculture. Consequently, the defoliation rate by caterpillars occurred mainly in monoculture, with greater intensity in the interior of the plot compared to the trees in the edge, suggesting that solar irradiance influences the pest establishment in the field. Besides that, in eucalyptus monoculture, it was necessary to use two sprays of Bacillus thuringiensis-based insecticides at 1 L ha−1 with a 15-day interval, while in the integrated systems this was not needed due to the low damage caused.

中文翻译：

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桉树生产系统中落叶者 Glena unipennaria (Guenée, 1857) (Lepidoptera: Geometridae) 的侵染水平

这项工作的目的是评估涉及桉树栽培的生产系统对侵染的影响以及控制其落叶者 Glena unipennaria 的必要性，以证明综合生产系统的可持续性。在以下系统中对成虫侵染进行了评估：(1) 桉树单一栽培，(2) 农林业（谷物与桉树结合），（3）林牧（栅栏草与桉树结合）和（4）农林牧（在谷物后种植的栅栏草，两者均与桉树集成）生产系统。结果表明，综合系统中的成虫侵染率明显低于单一栽培中的桉树，并且与桉树不同。因此，毛虫的落叶率主要发生在单一栽培中，与边缘的树木相比，地块内部的强度更大，这表明太阳辐照度影响了田间害虫的建立。除此之外，在桉树单一栽培中，需要以 1 L ha-1 的间隔喷洒两次基于苏云金芽孢杆菌的杀虫剂，间隔 15 天，而在集成系统中，由于造成的损害较小，因此不需要。