What are the occurrence patterns of the privet hawk moth (Clanis bilineata)?

Occurrence patterns of the privet hawk moth (Clanis bilineata): In Hebei, Shandong, Jiangsu, Anhui and other places, 1 generation occurs per year, and the mature larvae burrow into the soil at a depth of 10 to 15 cm to overwinter. In early to mid-June of the following year, pupation begins. The pupal stage lasts 10 to 15 days. In early to mid-July, adults emerge, with mid-month being the peak emergence period. During the day, adults rest quietly among branches and leaves, and begin activity in the evening; adults are phototactic. Generally, egg laying begins 3 hours after mating, with eggs mostly laid on the underside of leaves and a few on the upper side. Each female lays an average of about 350 eggs. Adults live 7 to 10 days. The egg stage lasts 6 to 8 days. From mid-July to late July, the eggs begin to hatch. Newly hatched larvae can spin silk threads and hang down, spreading to nearby plants with the wind. Early to mid-August is the larval occurrence period. Larvae are phototactic and have the habit of moving between plants to cause damage. Larvae of the 1st to 3rd instars mostly rest on the underside of leaves during the day to avoid light and sleep, and feed at night; in rainy weather they cause damage all day. Larvae of the 3rd to 4th instars feed leaving only the leaf veins. The larval stage is about 30 days. Mature larvae generally enter the soil to overwinter in mid-September, with the body in a horseshoe shape, curled up in the soil.