Vitis permeana belongs to Lepidoptera and permeanidae. It only harms grapes and is widely distributed.
The adult is about 18 mm long and its wings are about 3 mm long. The body is blue-black, with orange stripes on the head, neck, both sides of the back chest and the joints of various links in the abdomen. The front wings are reddish brown, the wings are black and the rear wings are transparent. Oval brown, oblong, flat. The mature larvae are about 38 mm long and slightly cylindrical. The head is reddish brown, the mouthparts are black, the trunk is light yellow, and it is purple when it is ripe. There are inverted splays on the back plate of the chest. The pupa is about 18 mm long, oblong and reddish brown (Figure 48).
fig. 48. Grape penetrating moth
1. Adult 2. Larvae 3. Pupa
occurs once a year. Larvae overwinter in grape vines, pupate in early May of the following year, and emerge from early June to early July. After eclosion, they lay eggs in 1 ~ 2 days, and the eggs are laid on the shoots. A female moth can lay more than 4 eggs. After hatching, the larvae are eaten into the tender stem from the base of the petiole of the new tip. Larvae often pile up a lot of feces near the wormhole, and the damaged part often expands like a tumor, so that the leaves turn yellow and the fruit falls off. Larvae began to damage in July and overwintered in thick vines in October.
prevention and cure methods ① the swollen branches found during winter pruning should be cut off and burned. (2) During the emergence in June and July, the twigs are often inspected. When withered, decayed holes and feces are found, 1,5 times of 5% fenitrothion or 1, times of 5% phoxim emulsion can be injected into the holes, and then the holes are sealed with clay.