Dynamics of borer infestation in atemoya fruit in two production periods

Abstract Cerconota anonella (fruit borer) and Bephratelloides pomorum (seed borer) are the main pests of Annonaceae and knowing their population dynamics is essential to establish their management in orchards of these crops. The objective of this study was to evaluate the influence of native vegetation on the population of fruit and seed borers in two production seasons in an atemoya orchard in the semiarid region. The study was carried out in a commercial atemoya orchard in Janaúba, MG. The experimental area was divided into two parcels and, in each of them, the distance from the experimental plots to the surrounding vegetation, of approximately 10m, 33m, 57m and 81m, was recorded. The sampling of insects was carried out at different periods, spring and summer, through the collection, every two weeks, of atemoya fruits containing attack signs by the borers. The intensity of infestation of each borer species was determined. The intensity of borer infestation varies between seasons, with fruit borer infestation in summer and seed borer infestation in spring. The distance from the orchard to the adjacent vegetation does not interfere with the infestation intensity of fruit and seed borers.摘要：Cerconota anonella（果蛀虫）与Bephratelloides pomorum（种蛀虫）为番荔枝科（Annonaceae）作物的主要害虫，明晰其种群动态对该类作物果园的害虫防控工作至关重要。本研究以半干旱地区的阿蒂莫耶番荔枝（atemoya）果园为研究对象，旨在探究原生植被对两个生产季内果蛀虫与种蛀虫种群的影响。试验于巴西米纳斯吉拉斯州雅纳乌巴市的商业化阿蒂莫耶番荔枝果园开展，将试验区域划分为两个地块，在每个地块内设置与周边原生植被间距分别约为10m、33m、57m及81m的试验样区，并记录各样区与周边植被的距离。昆虫采样分别于春季与夏季进行，每两周采集一次带有蛀虫为害症状的阿蒂莫耶番荔枝果实，以此完成采样流程。本研究测定了两种蛀虫的侵染强度，结果表明：蛀虫的侵染强度存在显著季节差异，果蛀虫的侵染高峰出现在夏季，种蛀虫的侵染高峰则集中于春季；此外，果园与周边原生植被的间距并未对果蛀虫与种蛀虫的侵染强度产生显著影响。