BAGWORM INFESTATION AND NATURAL CONTROL BY RED WEAVER ANTS, OECOPHYLLA SMARAGDINA

The Planter Pub Date : 2023-06-30 DOI:10.56333/tp.2023.021
G. F. Chung
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Abstract

During a recent large outbreak of bagworms, Metisa plana, aerial photographs taken by an unmanned aerial vehicle (UAV) some green spots of almost non-damaged palm canopy were discovered amongst the thousands of badly damaged palms. With assistance from the plantation personnel, infield checking was carried out on two green spots. Small feeding holes were observed on some fronds. The presence of nests of red weaver ants indicated their deterring impact on bagworm infestation. In other words, good effective natural control of M. plana was due to predation by weaver ants. Habitat manipulation and specific measures are required to enhance red weaver ant population (indicated by nests) and the nest distribution to all palms are important for both natural and biological control. Consideration is needed to deal with the negative aspects of having red weaver ants on harvesters and oil palm in order to harmonise the implementation of biological control. Keywords: Oil palm, bagworm infestation, natural control, red weaver ants.
红织蚁对白蛉的危害及自然防治
在最近的一次大爆发中,Metisa plana,无人驾驶飞行器(UAV)拍摄的航拍照片显示,在数千棵严重受损的棕榈树中,发现了一些几乎未受损的棕榈树冠的绿色斑点。在种植园人员的协助下,对两个绿点进行了内场检查。在一些叶子上观察到小的喂食孔。红织蚁巢穴的存在表明其对白蛉的抑制作用。也就是说,对平面m.a plana的良好有效的自然控制是由于织蚁的捕食。生境控制和具体措施对提高红织蚁种群数量(以巢为指标)和巢在各棕榈树的分布具有重要的自然和生物防治意义。需要考虑处理在收割机和油棕上有红编织蚁的负面影响,以便协调生物控制的实施。关键词:油棕;蛴螬;自然防治;
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