Jujube bud
Jujube buds, also known as jujube fly elephants and small gray weevils, are common and dangerous in the distribution areas of jujube gardens in Shandong, Hebei, Shaanxi and Shanxi. Adults eat buds and young leaves in early spring. In severe cases, the buds of jujube trees can be eaten twice to cause germination, affecting the yield of jujube fruits and seriously affecting the tree potential.
Jujube buds occur in the first year of the year, and the larvae overwinter in the soil 5~50cm deep underground. In the second half of March to the end of April, the adults will become paralyzed, and the adults will be feathered from mid-April to early June. After the adult is feathered, the buds are sown, and the buds cannot be re-emerged for a long time after being damaged. The re-emergence of the new shoots, the jujube growth is short, only a small amount of late jujube can be formed and the quality is poor. After the young leaves are unfolded, the jujube bud can bite the tip into a semi-circular or jagged nick. Before May, the adult worms harmed the trees around noon on sunny and windless days, and sooner or later they lurked near the trunk. Adults will be active sooner or later after May. Eggs are mostly produced in the buds, leaves, jujubes, or cracks of jujube trees. After the larvae hatch from May to mid-June, they sneak into the soil along the tree trunk to feed the fine roots. After September, dive again to the depths of 30cm for the winter.
Prevention:
Before the adult in early spring, the old skin of the trunk 20-30cm wide was scraped off, then tied with a 20cm wide plastic film, and the middle part was tied with 2.5% deltamethrin 1000 times liquid soaked straw. The lower roll prevents the adult from getting on the tree, causing the pest to die at the poisonous rope. Using its stagnation in the morning, the bark was hit with a rod, and 52.5% of the chlorinated chlorpyrifos was sprayed under the tree. The insect died after being poisoned. The 26% phoxim + cyhalothrin spray on the tree can effectively poison the leaf-eating adults.
Jujube
Jujube armyworm, also known as jujube winged moth, is one of the important pests of winter jujube. The larvae are used to smear the leaves, twigs and fruits together, and the food leaves, flower buds, flowers and fruits are reduced or even eliminated. Jujube armyworms occur for 3 generations a year, and they linger over the winter in the bark seams and tree holes.
In the late March of the next year, it began to emerge. In mid-April, it was the peak of feathering. Adults were lurking after daylighting, and activities at night were very strong. Eggs are scattered on both sides of the smooth mid-vein of the twigs or jujube leaves. The first generation larvae occur in the leaf-expanding stage, which jeopardizes the buds. At the beginning of May, the larvae spore leaves or leaflets, and feed the mesophyll. After the larva is mature, it is crusted in the leaf. The first generation of adult worms occurred in the middle and late June. The second generation larvae occur in the late period from late June to early July, and the adult emergence period is in late July. The third generation larvae occurred in the middle of August. In addition to the damage caused by leaf rolling, the second generation larvae also harm young fruits. In addition to the damage of the leaf, the third generation larvae also affixed the leaves to the fruit surface, in which the fruit was eaten, and the larvae of this generation were harmed until the beginning of September, and then they crawled into the bark seams or tree holes. The phlegm turned into winter, and all of them went into winter in mid-October.
Prevention:
1. Artificial control, one is to scrape the bark in early spring and burn it off; the second is to tie 3cm thick straw straw to the third generation old mature larvae in the first part of the trunk branch in early September. After the leaves are removed, the grasshoppers are removed, and the insects stuck on the bark are scraped off and burned intensively.
2. Drug control, first, the germination period of the jujube buds is 3cm, but before the leaves are unfolded, it is the first larva hatching period, spraying 2.5% cyhalothrin, or 26% phoxim + chlorine The control of cyfluthrin spray; the second is the conditional release of the artificially propagated pine caterpillar Trichogramma in the second and third generations of juvenile muskworms to achieve the elimination effect by parasitic means.
Jujube
Jujube mosquitoes, also known as jujube leafhoppers, are distributed in jujube production areas in Hebei, Shaanxi, Shandong, Shanxi, Henan and other places. The young leaves, flower buds and young fruits of winter jujube are harmed by larvae.
The leaf edge of the damaged leaf is longitudinally rolled to the front of the leaf. The leaf curl is purple-red in the early stage, the texture becomes brittle, and the leaf is brownish green in the later stage, and the damaged leaves gradually become black and withered. After the flower buds are killed, the flower buds are swollen and cannot be opened. The young fruit turns yellow and falls off shortly after being licked. Jujube mosquitoes occur in the jujube area for 5-6 generations in the jujube area. The old larvae are overwintered in the soil and the distribution in the soil layer is 2~5cm. After the germination of the winter jujube in the next year, the eggs are produced on the edge of the unexpanded young leaves. The hatched larvae suck the young leaves juice, and the leaves are longitudinally wounded in late April. There are 1 or several small white larvae in the leaf. The early May is the end of the hazard. In mid-May, the damaged leaves gradually fall off, at the end of May. By the beginning of June, the larvae had matured and landed in the soil. In the first half of June, it became an adult, and after the young leaves were reduced, the damage was gradually lightened. There were 5 to 6 obvious peaks throughout the year. In late August, the larvae gradually matured, falling into the soil and crusting, and transferred to winter.
Prevention:
1. Artificial control: First, in mid-April, combined with jujube gardening and weeding, the cockroaches are turned into deep layers to prevent adult emergence and emergence. In the late May, the jujube garden irrigation can kill a large number of second-generation larvae and pupa; the second is to pile up the soil at the base of the trunk, and choose the larvae to emerge from the beginning of June, and grow 10-15 cm thick within 1 m from the trunk. The mound is sturdy and sturdy to prevent the emergence of feathers.
In addition, before the end of August of that year, the film was covered under the jujube trees to prevent the emergence of overwintering cockroaches, which greatly reduced the number of insect sources.
2. Drug control: The focus of prevention and treatment is the first generation of larvae. If the prevention and treatment is good, the generations will not focus on prevention and control, and they can treat both red spiders and scale insects. At the beginning of May, when the 5-6 leaves were spread, the trees were sprayed once, and the first generation larvae were sprayed once on the ground. Optional agents: 5% cypermethrin + imidacloprid, 20% imidacloprid solution, 80% dichlorvos emulsion. Chemical control measures should be adopted for the visual hazard degree of jujube gardens over ten years old. New jujube gardens should take strict measures to prevent jujube mosquitoes.
Ground application should be combined with joint prevention and treatment, and a large area should be carried out in a unified manner. During the first and second generations of mature larvae, 50% phoxim emulsifiable concentrate was sprayed on the ground 1 m around the trunk, 0.5 kg per 667 m2, and shallow ploughing after spraying could kill the mature larvae entering the soil. Spray on the tree, spray 50% malathion EC 1500 times solution when the jujube sprouts and has not yet spread the leaves, and spray again after 10 days.
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