Atrijuglans hetaohei moth, also known as black walnut,,heliodinidae lepidoptera.
Distribution and damage: in Hebei, Henan, Shanxi, Shaanxi, Gansu, Sichuan, the province such as Guizhou walnut producing occur commonly, serious harm. Larva eats fruit and walnut kernel, killed black pericarp, shrinkage, dry shrinkage of kernel also turned black, caused early fruit drop, seriously affecting the yield of walnut.
Morphological features: adult body length from 4 to 8 mm, the exhibition wings from 12 to 15 mm, dark brown; forewing wing is long and narrow, dark brown, end 1/3 with a near crescent leukoplakia, wing base near the trailing edge of a small round 1/3 white, margin brown black, hind wing brown. Body silvery white ventrally; egg length 0.3 ~ 0.4 mm, oval, primiparous is milky white, after the gradual into pale yellow, yellow or light red, before hatching is red-brown; pupal length 4 ~ 7 mm, fusiform, yellow-brown to dark brown; cocoon length 7 ~ 10 mm, long elliptic, brown, often adhesion fine soil grains.
Living habits and occurrence regularity of: Hebei, Shanxi has 1 generations every year in Shaanxi, Beijing, each year 1 - 2, Henan has 2 generations every year, all the old larvae in soil under crown or weeds, dead leaves, stones, soil seam between Cocoon overwintering. In the 1 generation zone in early June to late July overwintering larvae pupate, pupation Sheng period in late June. Pupal period of 7 days. In late June to late July start shedding, in early August for shedding season, shedding cocoon overwintering larvae. 2 generation area adult occurred from mid May to mid July and early July to early September. The adult night, during the day and inhabits the lower part of the crown of walnut leaf blade abaxially and crown in the grass under the foot, lift, often swinging back and forth, named hetaohei moth. The moth in late 7 when before and after the activity, fly, copulation, spawning,. Egg prolific in two fruit phase, can also be produced in the calyx, Terrier depression or petioles, each 1 to 4 grains per head, the female can lay 30 to 40 grains of life. The egg stage about 5 days. The newly hatched larvae in the fruit surface crawling from 1 to 3 hours after bore into the fruit, the Qingpi horizontal string food. If the hole is very small, not easy to find. Bored channel filled with frass, eaten around black rot, the Qingpi crinkle black, early deciduous. Each fruit may have within the larvae of 5 - 7 head, are up to more than 30. Atrijuglans hetaohei moth damage, usually in remote mountains area in shallow mountain, slope to slope, ditch in the ditch, wasteland in farmland, emergence period rainfall occurs, year of drought occurrence of light.
Recommended prevention methods: each 667m2 with 10000000000 /ml Empedobacter brevis spore suspension agent from 80 to 100 ml of water at around 45 kg, in the oviposition period every 10 to 15 days is uniformly sprayed mist 1. |
