How to control the grape clearwing moth? Timely prevention and control is needed when growing grapes
In recent years, the grape clearwing moth has occurred in many vineyards and courtyard grapes in Xuzhou, mainly damaging grape vines, causing reduced yields and even the death of entire plants.
The grape clearwing moth damages young grape shoots and 1-2 year old vines with its larvae. The young larvae bore into the tender shoots and feed on the pith, causing the tender shoots to die. After the larvae grow larger, they move to thicker vines to cause damage. The damaged part swells, and brown granular frass is present outside the bore hole. Nearby leaves turn yellow, fruit drops, and the stem breaks easily.
In the Xuzhou area, the grape clearwing moth generally has 1 generation per year, overwintering as mature larvae in grape vines. In early May of the second year, pupation begins, and from mid-to-late May to mid-to-late June, adults emerge, at the same time as the flowering period. Adults have strong flight ability and are active during the day. Eggs are laid singly at the axillary buds of tender shoots, on petioles, and on leaf veins, generally 20-27 eggs per female. After hatching, the larvae bore and feed, and from September to October they overwinter as mature larvae.
To control the grape clearwing moth, manual capture and chemical control should be combined. (1) Manual capture. From mid-May to July, frequently inspect tender shoots and new growth. When frass is found on vines, promptly prune the vines and bury them deeply in a centralized manner. If the vine is relatively thick, a steel wire can be inserted into the frass hole to stab the larvae to death. In addition, in combination with pruning in autumn and winter, prune and centrally burn the vines whose swollen parts contain larvae. (2) Chemical control. From mid-May to late June, use insecticides such as diflubenzuron for spray control. For damaged thick vines, insert a cotton ball soaked in diluted dichlorvos into the insect hole, or use a syringe to inject an appropriate amount of pesticide solution into the bore hole, then seal the insect hole tightly with clay.