Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Population fluctuations of pentatomids (Hemiptera: Pentatomidae) in soybean [Glycine max (L.) Merrill] and birdsfoot trefoil (Lotus corniculatus L.).

Abstract

Pentatomids are the most important insect pests in soybeans crops in Uruguay. They have an abundant source of legume forage crops, which predomine over the growing season in the Uruguayan production system that combines agriculture and cattle breeding. Thus, high populations of pentatomids are found in the reproductive growth stages of soybeans. Piezodorus guildinii (Westwood) is the predominant species in soybeans and there is little information of other pentatomids for this crop and forage legumes. Weekly samples were taken for two years in soybeans and birdsfoot trefoil in order to determine the presence and population dynamics of pentatomid species. A vertical beat sheet and an entomological sweeping net were used in soybeans, while only the latter was used for sampling in the forage legume. P. guildinii was confirmed as the predominant pentatomid species in both crops. Nezara viridula (Linneo), Edessa meditabunda (Fabricius) y Dichelops furcatus (Fabricius) were also found in soybeans while D. furcatus and nymphs of N. viridula were also found in birdsfoot trefoil. The results obtained in this study suggest that pentatomids could develop their first generations in lotus on spring, and from there they can colonize reproductive soybean crop on late summer. Depending on the year, the first adult registered in soybeans was D. furcatus or E. meditabunda while the last adult found was always N. viridula. Maximum populations of all species were registered in the R6 growth stage in soybeans.