Surveys of False Chinch Bug, Nysius raphanus (Howard) (Hemiptera: Lygaeidae) and Their Movement on Cultivated Crops and Non-cultivated Habitats Throughout Growing Season in Colorado

摘要

A three-year survey was conducted to evaluate population density of False Chinch Bug (FCB), Nysius raphanus (Howard) (Hemiptera: Lygaeidae) and their movement on cultivated crops and non-cultivated habitats throughout the growing season in Colorado (USA). The first population of the FCB appeared winter mustard such as Flixweed, Descurainia spp., in Larimer and western weld County in Colorado. Within a wide host range, they moved from alfalfa after cutting to adjacent crops, i.e. canola and caused significant injury during early flower and pod stages. They also moved to canola from wild mustards, flixweed, D. sophia L. and tansy mustard, D. pinnata (Walt.), which were present in both non-cultivated areas and cultivated crops. Furthermore, the dry weather condition might be increased the activity and outbreak of FCB on the cultivated crops and non-cultivated habitats, whereas the heavy rain was decreased the population density of FCB. Knowing the population density of FCB and their movement on cultivated crops and non-cultivated habitats is important to predict their injury to canola plants and for developing new control strategies.