The genus Zauzera sp. is commonly referred to as cutworm, six-spotted moth, belonging to Lepidoptera, Lepidoptera and Moth.
Distribution in Hebei, Henan, Shandong, Shaanxi and other places. This worm mainly damages walnuts and jujube trees, followed by apples, apricots, pears, pomegranates, and hedgehogs. This worm seriously damages the jujube head, making the canopy of the jujube tree unable to expand. It becomes a small old tree all year round, affecting the yield of the jujube tree.
Hazardous? There is a hole in the ring between the xylem and the phloem of the base of the victim, with a bottom-up insect path. There are several excretion holes on the branches, and a large number of long oval-shaped insect excrement. The upper part of the victim is yellow and withered, and the wind easily breaks. The larvae invaded the jujube tree 1 to 2 years old branches, the upper part of the victim tip withered, and the wind easily collapsed.
Morphological characteristics adults: adult female moth body length of 18 to 20 mm, wings 35 to 37 mm; male body length 18-22 mm, 34 to 36 mm wingspan. There are 3 pairs of dark blue spots parallel to the chest and black and blue spots on each section of the abdomen. The wings are gray. The front wings have scattered dark blue spots of varying sizes.
Eggs: pale apricot yellow at the time of first production, with a reticular pattern.
Larvae: brown-headed, black on upper eyelids and monocular areas, body reddish purple, brown hairs, wide pronotum, 1 pair of cotyledon-shaped black spots, 4 rows of small black spines on posterior border, and black buttocks. The mature larvae are 32 to 40 mm long.
蛹: Auburn brown. Body length 25 to 28 mm. Two black round spots appear on the side of each abdominal section at the time of the proximal feathering.
Life habits occur one generation in a year and the mature larvae spend their winters in the affected branches. During the second year of April to May, eclosion occurs, and each female can lay up more than a thousand grains. The larvae invade from the main vein or the base of the bud after hatching. Biting a row of fecal holes at intervals from top to bottom. A larva can damage 2 or 3 shoots. The larvae damage until the middle of October and winter in the branches.
Control methods
1. From April to early June in spring, when the overwintering larvae become harmed and the larvae often inspect the jujube gardens, they find that shoot shoots are dead or the jujube hangs to death, that is, the insects damage. Cut and cut the damaged branches with sorghum scissors. Concentrated burning, this work must be completed before the beginning of June, which is the focus of prevention and control throughout the year.
In September and September, when the small larvae were at the height of their damage, they were still cut with branches and cut to destroy the damaged branches, concentrated burning, and reduced the number of insects.
3. Chemical control: adult oviposition and egg hatching, spray 80% dichlorvos EC 1000 times and so on.
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