Walnut Humming Moth also known as walnut black or black walnut, in recent years, is the most serious pest of walnut production. Because the early hazards are not obvious, and most of the larvae, in particular, drill into the hard shell, they are not well-discovered. Once a fruit drop is found, or when the fruit is dark, the timing of prevention and control is often missed. The extremities are most likely to end in early July, but they must be “early†to prevent their damage. The walnut agama moths occur in Shandong, Hebei and other regions one to two generations a year, mostly in 2 generations. The mature larvae are 1-3 cm deep under the canopy, within the soil, under the stones, or in the wrinkled crevices at the base of the trunk. Wintering. After the wintering larvae have fallen into the pupa, feathers have emerged from the beginning of the second year of the year, and in late May, the emergence period has been unearthed. Adults were nocturnal and lived during the day. They inhabited on the back of the lower leaves of the walnuts and in the ground grass during the day. They flew around 7 o'clock in the evening, spawned and spawned, and were spawned at the junction of the two fruits, followed by the pods, and only a few eggs were produced. Near the stem stalk or on the petiole, 30-40 eggs were laid by each female, and the egg period was 4-5 days. The larvae crawled on the fruit surface after hatching for 1-3 hours and then dipped them into the fruit. The waterdrops on the fruit hole showed waterdrops, which became clear and then became amber. The tunnel was filled with insect excrement and was rotted in black. In the early stages, the pericarp shrinks and darkens, falling off earlier, but the larvae do not turn fruit damage. The first-generation larvae began to bite through the peel in early July after 30-40 days of infestation in the fruit, and the fruit was removed from the soil and wintered. The walnut shell of the second generation larvae has hardened, mainly in the green skin, from the beginning of August to the first half of September. The best time for prevention and control should be to seize the method of physical prevention and chemical prevention from the beginning of february excavation in early May and the emergence of feathers in the middle and late May, and to comprehensively prevent it in advance. Physical control: Membrane can be covered under the tree. In the middle and early May, before the overwintering larvae emerged, the ground was leveled and covered with a multi-functional double-colored plastic film. Not only did the unearthed moths of the excavation moths die in the film. Below, reduce the exertion and waste of spraying on the ground or trees. And can play grass, water drought, fertilizer, keep the soil loose. Chemical control: in mid-May (before the emergence of adult feathers), the ground was fined, and 1,000 times of phoxim or 1500 times pyrethroid pesticides were sprayed on the ground under the walnut trees to kill the adults to be excavated; In late May to late June, spray 1,000 times of phoxim or 2000 times of pyrethroid pesticides on the trees every 10-15 days and add 600 times carbendazim or 1000 times thiophanate methyl to kill. Adult moths, eggs or hatched larvae, and concurrent treatment of walnut anthracnose; after July, timely picking up the fallen fruit under the tree, concentrated burning or deep buried to prevent larvae fruit removal into the soil; to the larvae in September and October After entering the soil through the winter, the ground was raked, the rakes were leveled and the ground was sprayed with 1000 times more phoxim to kill the overwintering larvae. In this way, it is basically possible to put an end to the harm of the limb moth to walnuts.
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