Walnut Hurdles (Atrijuglans hetaohei Yang), alias "Walnut Black". Distributed in Hebei, Henan, Shanxi, Shaanxi, Gansu, Sichuan, Guizhou and other walnut production areas. The walnut production areas of Taihang Mountain and Yanshan Mountain in Hebei Province; Jindongnan, Jinzhong and Shanxi Provinces in Shanxi Province; and the walnut production areas in Guanzhong and Southern Shaanxi Provinces in Shaanxi Province are widespread and serious.
Injury characteristics?? larvae into the fruit, food and drink up and down, forming a fistula, feces in it. Out of the hole out of transparent or amber water droplets, after the green peel shrinkage black rot, fruit surface darkening shrinkage, causing a large number of fruit drop.
Morphological characteristics?
Adults: 5 to 8 mm in length, 12 to 14 mm in wingspan, dark brown and shiny. Compound eye red; antennae filamentous, pale brown; lower lip to be well developed, silvery white, curved upwards, over head. The fins are long and narrow, with long ciliata; there are 1 half moon-shaped white spots at the 1/3 of the fore wings, and there are 1 small white spots (sometimes insignificant) along the 1/3 of the base. The back of the abdomen has black and white scales and its abdomen is silver-white. The foot is white and the back foot is long. The ganglion and ganglion have ring-shaped black burrs. When they are still, the gongs and gongs are lifted to the side and rearwards.
Eggs: oval, 0.3-0.4 mm long, milky white at the time of first birth, yellowish-white, yellow or light red in color, and reddish-brown when hatched.
Larva: At the time of initial hatching, the body is 1.5 mm long, milky white, and the head is tan. The mature larvae have a body length of 7.7 to 9 mm, a dark brownish-white, dark brown head on the head, a slightly pinkish abaxial surface, and sparse white bristles.
蛹: 4 to 7 mm in length, spindle-shaped, yellow-brown. Cockroaches are elliptical, 8 to 10 mm long, brown, and often adhere to grass and fine soil particles.
Life history and habits: Walnut excavation moths can occur in the southwestern walnut production area for 1 generation in 1 year, 1 generation in Shanxi and Hebei, 2 generations in Henan, and mature larvae are in the soil 1 to 2 cm below the canopy. The overwintering occurs in the coarse skin cracks under the stones and in the base of the trunk. In Hebei Province, wintering larvae phlegm from early June to late July, with the booming period in early June and the flooding period of about 7 days. Adults occur from early June to early August, and from late June to early July. The larvae began to harm in mid-June, with some years occurring earlier and beginning in early June. The mature larvae began fruiting in mid-July, and the larvae had fruit in the early part of August and the end of September. In Mianyang, Sichuan, overwintering larvae began to phlegm in early April, and in mid-and late-May, they were phlegm-rich and pupa periods were 7-10 days. Overwintering adults first appeared in fruit diameter 6-8 mm in late April. 5 The middle and late months are the peaks, and the upper and middle months of June are the end stages; in the middle and early May, larvae are the main victims. The first adult worm emerged in June; second-generation larvae began to appear in late June.
Adults tend to be slightly phototaxis, mostly in the lower part of the canopy of the canopy and mating, spawning more in the afternoon 6 to 8 o'clock, the eggs are mostly produced in the gap between the two fruit, followed by production in the pupa, stem or petiole . Generally, 1 to 4 capsules are produced per 1 fruit, and there are more in the later period, and 7 to 8 capsules can be produced per 1 fruit. Each female can lay 35-40 eggs. Adult life is about 1 week. Egg period 4 to 6 days. After larvae are egg-shaped, they crawl on the fruit surface for 1 to 3 hours, then there are 5 to 7 larvae in one fruit, and up to 30 heads. The fruit is harmed within 30 to 45 days. The fruit peels into the soil and the fruit breaks down. . During the second generation of larvae, during the fruit development period, the endocarp was hardened, and the larvae could only feed on the mesocarp, and the fruit surface became darker and depressed. When walnuts are harvested, about 80% of their larvae lay fruit and cover their pods for winter. A few larvae are brought into the sun for harvesting.
Control methods??
1. Deep-turning tree trays: Deeply turning over the soil under the canopy in the late autumn or early spring, destroying the worms, eliminating some of the overwintering larvae, or rendering the adult ecloses unable to emerge.
2. Canopy Spraying: Grasp the adult spawning period and larval incubating period, and spray once every 10 to 15 days with 50% killing chlorate EC or 50% phoxim EC 1000 times, 2.5% bromocyanide Chrysanthemum emulsifiable concentrate or 20% cypermethrin emulsifiable concentrate 3000 times, etc., were sprayed 3 times in total, and the larvae were eliminated before the pods.
3. Ground application: Before emergence of adult eclosion or emergence of individual adults, spray 50% phoxim EC on the ground around the trunk and apply 0.5 kg/mu, or apply 4% enemies powder. 0.4 to 0.75 kilograms of strains were used to kill soil adults. The use of phoxim EC or equine powder under the canopy during the larval eradication period can also effectively kill larvae. 4. Remove the victim and lightly damage the tree, and remove the blackened fruit in time before the larvae are removed. This will reduce the mouth density of the next generation.
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