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：暗喙夜蛾（Cerconota anonella，fruit borer，果实钻心虫）与番荔枝种子螟（Bephratelloides pomorum，seed borer，种子钻心虫）是番荔枝科（Annonaceae）作物的主要害虫，明确其种群动态对建立该类作物果园的害虫防治方案至关重要。本研究旨在探究半干旱区（semiarid region）一处阿蒂莫耶番荔枝（atemoya）果园内，本土植被对两个生产季中果实钻心虫与种子钻心虫种群的影响。本试验于巴西米纳斯吉拉斯州雅纳乌巴（Janaúba, MG）的商业化阿蒂莫耶番荔枝果园中开展。试验区域被划分为两个试验小区（parcels），每个小区内均记录了试验样点与周边植被的距离，分别约为10m、33m、57m与81m。研究于春季与夏季两个不同时段开展昆虫采样：每两周采集一次带有钻心虫为害症状的阿蒂莫耶番荔枝果实，并测定了两种钻心虫各自的虫害发生强度。钻心虫的虫害发生强度存在季节差异：果实钻心虫的虫害发生集中于夏季，种子钻心虫的虫害发生则集中于春季。果园与周边植被的距离并未对果实钻心虫与种子钻心虫的虫害发生强度产生影响。