Perilla borer, also known as Suzi wild borer, Lepidoptera borer family perilla borer, in Hebei, Beijing, Fujian, Zhejiang, Taiwan and other places. Larvae harm perilla, salvia, Zelan and so on.
[1] Hazards occur
The larvae roll the leaves into a barrel shape, hide in them to eat the leaves, often bite off the main vein, causing the leaves to break and dry and droop, while eating the young shoots, biting them off, and in severe cases, the young shoots of perilla are not spared.
[2] Morphological characteristics
The body of the old mature larvae is about 17 mm long and is divided into two shades: green and purple. The head is light brown with dark brown dot-like stripes, with intermittent white bands along the dorsal midline, the sides of the inferior valve line, and the midline of the abdomen. The dorsal plate of the anterior thorax is black on both sides and the posterior margin, and there are 3 pairs of black hair patches in the middle, posterior thorax and abdominal segments 1 to 8 each. Adults are about 7 mm long and have a wingspan of about 14 mm. The head is orange with white stripes on both sides of the head. The antennae are slightly hairy, and the lower jaws are yellowish brown. The lower lip should be stretched flat forward, yellow-brown on the upper side and white on the lower side. The back of the chest and abdomen is orange and the ventral surface is white. The feet are white with orange rings. The apex of the hindwings is dark reddish brown with a diagonal line from the terior edge to the upper hip angle.
【3】Biological characteristics
3 generations per year, as 3 instar or terminal larvae overwinter in cocoons in residual leaves or soil crevices. Pupates pupate in April to May of the following spring and adults begin to appear between May and June. From July to August, the hazards are heavy. The summer egg period is 3 days and the larval stage is 10 to 15 days. Each female lays about 180 eggs, most of which are laid on the back of the leaves. The larvae like to roll the leaves into a cylinder, hide in them to eat the leaves, and often move out of the tube after reaching the end of age, biting off the young shoots, and after aging, they form a thin cocoon in the leaf tube or in the soil cracks. Adults inhabit the leaves of the host or nearby peach trees during the day. From August to September, some of the 2nd generation of last-aged larvae and the 3rd generation of larvae overwintered.
[4] Preventive and control measures
1. Frequent inspection during the growing season, it is found that the leaves are rolled and then cut off and destroyed, killing the larvae in the roll.
2. After pulling out the dead plants in late autumn, pick up the residual leaves on the ground and bury them deeply, carefully prepare the land, break the soil blocks, and eliminate the overwintering insects.
3. After the larva hatches, the larvae are used to spray evenly with 160 to 200 kg of water per bottle.
