Jujube buds
Jujube buds, also known as jujube and small gray weevil, are widespread and endangered in the distribution areas of Shandong, Hebei, Shaanxi and Shanxi. In the early spring, adults can eat young shoots and young leaves. In severe cases, the young shoots of the jujube tree can be eaten to cause two germinations, affecting the yield of jujube fruit and seriously affecting the tree vigor.
Jujube buds occur one generation in a year, and larvae live in the soil 5~50cm deep underground. From late March to late April, we will breed maggots. From mid-April to early June, adults will emerge. Emergence of adults after emergence of food buds, sprouts can not be re-germinated after a long time. The re-emerging buds, the jujube section grow short, only a small amount of late dates and poor quality. After the young leaves are unfolded, jujube buds can bite the tips of the leaves into semicircular or jagged nicks. Before May, the adults jeopardized the trees around noon on a sunny, windless day, and lurked near the trunk in the morning and in the evening. After May, the adult will sooner or later. Eggs are prolific in the jujube tree shoots, leaf surface, or jujube stocks subcutaneous or cracks. After the larvae hatch from May to mid-June, the fine roots are immersed in the soil under the tree trunk. After September, they dive to the depths of about 30cm.
Prevention:
Before the adult was exhumed in the early spring, the old skin of 20-30cm wide was scraped off and then tied with a 20cm wide plastic film. The middle part was tied with 2.5% of deltamethrin 1000 times soaked in straw rope. Under the anti-rolling, the adults are prevented from getting onto the tree and the insects die at the poison rope. Using its dead-dead-morning morning bar, the bark was sprayed with 52.5% chlorpyrifos-chlorinated EC under the tree, and the insects died of poisoning after landing. During the occurrence period, spraying 26% phoxim + cyhalothrin on the tree can effectively kill the adult leafhoppers.
Jujube
Juvenile Mythimna separata is also one of the important pests of winter jujube. The leaves, twigs, and fruits of the larvae are stuffed together and the leaves, buds, flowers, and fruits are eaten by the larvae to cause a reduction in yield or even an imperfection. Juvenile Mythimna separata occurs 3 generations a year, and the wintering occurs in the bark seams and tree holes.
Feathering began in late March of the following year. In mid-April, it was the emergence period. Adults lurked after daytime feathering, and they were active at night. Their phototaxis was strong. Eggs scattered in the smooth twigs or jujube leaves on both sides of the veins. The first generation of larvae occurs during the leafing stage, which damages the buds and occurs at the beginning of May in early larvae. The larvae pass on the leaves or leaf curls and feed on the mesophyll. After the larvae are mature, the larvae grow into pods in the leaf. The first generation of adult emergence occurred in the middle and late June. The second generation of larvae occurs in the late June to early July, and the adult larvae occur in late July. The third generation larvae occur in the mid-August period. The second-generation larvae also harm young fruit, in addition to leaf curling. The 3rd generation larvae, in addition to leaf curling hazards, also affixed leaves to the fruit surface, where they attacked the flesh, and this generation of larvae jeopardized until the beginning of September, and then gradually matured and crawled into the bark joints or tree holes. The larvae entered the winter and all of them turned into winters in mid-October.
Prevention:
1. Artificial control: First, scrape the bark in the early spring and burn it off. Second, in early September, tie 3cm thick straw straw at the lower part of the trunk to trap and kill the third-generation mature larvae. After the fallen leaves, the grasshoppers were removed and the insects on the bark were scraped off and burned.
2. Drug control, the first is that the jujube bud grows 3cm long, but the germination period before the leaf is unfolded, is the first generation larvae hatching period, spraying 2.5% cyfluthrin, or using 26% phoxim + chlorine Cyhalothrin spray control; Second, conditional release of the artificial propagation of Trichogramma dendrolimi by parasitism in the second and third generation of date-advanced juveniles.
Jujube Mosquito
Also known as jujube leafhopper, it is distributed in jujube producing areas in Hebei, Shaanxi, Shandong, Shanxi, and Henan. The larvae harm the young leaves, buds and young fruits of winter jujube.
The leaf edge of the damaged leaf is wound up to the front of the leaf. The early leaves are purple, the texture becomes brittle, and the later leaves are brown green. The damaged leaves gradually turn black and wither off. After the flower buds were damaged, the buds were enlarged and could not be opened. The young fruit was yellowed off soon after being affected. Juvenile Mosquitoes occur in the jujube region for 1 to 5 generations, and the mature larvae in the soil cover the winter. The distribution range in the soil layer is 2~5cm. When the winter jujube buds emerge in the bud, the eggs are produced on the edge of the undeveloped leaves. The hatched larvae sucked the young leaf juice. In the end of April, the leaves began to curl up. There were 1 or several small white larvae in the leaf roll. In the first half of May, the damage period was prosperous. In the middle of May, the damaged leaves gradually burned off. At the end of May, By the beginning of June, the larvae had landed on the earth after being cooked. In early June, it became an adult, and afterwards, young leaves were reduced and the hazards were gradually lightened. There were 5-6 peaks throughout the year. In late August, the larvae become mature and fall into the soil and grow into overwintering.
Prevention:
1. Artificial control: First, in the middle and late April, the cultivator and weed in the garden of Zaoyuan will be turned into deep layers to prevent adult emergence from emergence. In late May, irrigation in the jujube garden can kill a large number of second-generation larvae and cockroaches; the second is to pile up soil at the base of the trunk and select the emergence of larvae in the first half of June. Within a range of 1 meter from the trunk, it should be 10-15cm thick. The mounds beat and sturdy to prevent emergence of adult feathers.
In addition, before the end of August of that year, covering the film under the jujube tree prevented the overwintering and feathering of the feathers, which greatly reduced the number of insects.
2. Drug control: The prevention and control focus is on the first generation of larvae. If the prevention and treatment are good, the prevention and treatment will not be carried out in each generation. It can be used to treat red spiders and scale insects. At the beginning of May, 5-6 pieces of leaves were sprayed on the trees, and the first generation larvae were sprayed once on the ground, depending on irrigation conditions. Optional agents: 5% cypermethrin + imidacloprid, 20% imidacloprid solution, 80% dichlorvos emulsion. More than ten years of age visible hazards Zaoyuan use chemical control measures, the new Zaoyuan should take strict measures to focus on prevention of Juvenile Mosquitoes.
The ground application should be joint prevention and joint treatment, and the large area should be unified. In the first and second generation of mature larvae in the soil, spray 50% phoxim EC on the ground 1 meter around the trunk, spray 0.5 kg per 667 square meters, and plough after spraying to kill old mature larvae Sprayed on the tree, sprayed 50% of malathion EC at 1500 times when the jujube sprouted but had not yet been sprayed, and then sprayed again 10 days later.
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