Cow cockle grows 30 to 90 cm in height (Biliaderis et al. It can be problematic in cropping systems due to its ability to compete with the crop for resources. ochrogaster pourrait entraîner des pertes importantes dans les cultures de saponaire.Ĭow cockle is an annual weed traditionally found in cropped fields, roadsides, and waste areas of the northern Great Plains region (Royer and Dickinson 1999). Il s'agit du premier rapport connu sur un insecte se nourrissant de la saponaire des vaches. Le rendement grainier fluctue aussi sensiblement entre les génotypes, avec une corrélation fortement linéaire avec l’étendue des dommages causés par E. Les dommages entraînés par Euxoa ochrogaster aux parcelles varient considérablement d'un génotype à l'autre, certains génotypes présentant moins de 10 % de dommages et d'autres, au-delà de 45 %. Les auteurs signalent les effets du ver-gris à dos rouge, Euxoa ochrogaster (Guenée), sur la saponaire des vaches ( Vaccaria hispanica Rauschert), en l'occurrence sur la hauteur du plant, le rendement grainier et le poids de mille graines. Premier rapport sur les dommages causés par le ver-gris à dos rouge à la saponaire des vaches (Vaccaria hispanica Rauschert), une nouvelle culture potentielle pour l'Ouest canadien. The larvae are greenish-gray and often curl up into a C-shape.Willenborg, C. However, it is not unusual to find army cutworm above ground when populations are high (Figure 1).
When scouting, it is critical to dig in the soil around individual canola plants to find the larvae.
Army cutworms behave nocturnally and typically spend the daylight hours below ground. The economic threshold for chemical control is 1-2 cutworms per foot of row. Where infestations are high, army cutworms will remove all leaf tissue, leaving only the base of the stem (Figure 3). When minor feeding is observed, you may find leaves severed from the plant and laying on the soil surface. The larvae feed on the leaf tissue, leaving the plants with a fed-on appearance (Figure 2). Significant army cutworm pressure has been observed in fields northwest of Caldwell in Sumner County.Īrmy cutworms feed aggressively and significant damage can occur in a short period of time. With the onset of warmer temperatures, winter canola is breaking dormancy and army cutworms are now present in fields across Kansas.
0 kommentar(er)
