Daxue jujube is a new adaptable jujube variety, which is large (maximum 100g) and late mature. The management is extensive and adaptable. It can be planted in both north and south. The prevention and control techniques of common pests and diseases are briefly introduced.
1. Disease prevention and control of jujube rust. Mainly invading the leaves, the yellow blisters first appeared on the back of the damaged leaves, followed by irregular green small spots, which later turned into yellow-brown or yellow-brown horn spots, and finally dried up. Early defoliation not only affects the yield of jujube in the current year, but also affects the growth and yield of the leap year.
The prevention and treatment methods are as follows: First, advance prevention. In the first ten days of July, spray the multi-type Bordeaux mixture 200 times, once every 10 days or so, even spray 3-5 times. It can also be sprayed with 50% sensitized zinc wettable powder 500 times. The second is to remove the treatment by spraying, and to treat the diseased tree with 1000 times of rusting. anthrax. Mainly infringe on the fruit, it can also invade the jujube, jujube and jujube. In the victim of the fruit shoulder or the fruit waist, the first yellowish water-stained spots appeared, gradually expanding to form a yellow-brown plaque, and a circular concave lesion was formed in the middle. The lesions were enlarged and spliced, showing a reddish-brown color, causing fruit drop. After the leaves are damaged, they turn yellow and fall early. Some are dark brown and burnt with hanging branches.
Control method: From late July to late August, spraying 1:200 times Bordeaux mixture three times to protect the fruit, not only can prevent jujube rust, but also prevent infection of anthracnose. Jujube shrinkage disease. Mainly infringing on the fruit, mostly yellowish water-stained plaques appear in the waist of the fruit. The flesh of the diseased part is yellow-brown and bitter. After the disease, the diseased part turns dark brown and loses luster. The diseased fruit gradually shrinks and shrinks, and the peel shrinks. Therefore, it is called shrinkage disease. Prevention and control: First, strengthen the management of jujube trees, increase the application of farmyard manure, and enhance the tree potential to improve the disease resistance of jujube trees. The second is to improve the health of the jujube garden and reduce the source of the disease. The third is timely drug control. Before the onset or early onset in early August, spray 50% of DT fungicide 500 times solution, or anti-drying, streptomycin and other agents, spray once every 7-10 days, even spray 3-4 times. Jujube madness. The disease is a devastating disease. The pathogenesis of the roots is clustered roots, and the roots emit several clusters of roots and shoots. The shoots appear as clumps of branches; the leaves are yellowed first, then the whole leaves are yellowed, the edges of the leaves are turned upwards, and the leaves are easy to scorch. The diseased leaves fall off; when the fruit is affected, the fruit surface is unevenly colored, uneven, unbearable, easy to drop fruit.
Prevention and control: 1 Completely excavate seriously ill trees and diseased roots, and burn them in time with fire. 2 Do a good job in quarantine, while cultivating disease-free seedlings, using disease-resistant varieties and rootstocks. 3 Control of insects: remove weeds and reduce the breeding grounds of insects. Spray the enemy to kill the emulsifiable oil from the end of June to mid-September to prevent insects.
2, pest control peach small heartworm. Commonly known as "heartworm", the larvae invade the fruit, one to three generations a year, mainly two generations. After the larva breaks into the fruit, it squats under the peel. After the sputum to the jujube nucleus, the larvae matured after 17 days in the fruit, and the fruit was removed into the soil. The first generation of larvae flourished from late July to early August, and the second generation larvae flourished from late August to early September. Prevention and treatment: First, prevention and control in advance, in the grounding period of the wintering larvae unearthed under the canopy, the overwintering larvae will be poisoned. The commonly used agents are: 50% phoxim emulsion. Second, when the pests occur, spray the medicine in time, strictly control the timing of spraying, focus on poisoning eggs and newly hatched larvae. Commonly used drugs are: 50% killing pine milk 1000 times liquid, 2.5% eliminating sweeping milk 2500 times liquid, 20% kills the chrysanthemum emulsion 2500 times solution and the like. Jujube armyworm. The jujube armyworm is also known as the leaf-rolling worm. The larvae feed on the inner leaves. From mid-May to early June, they mature and mature in the leaves. In the middle of June, the first generation adults emerged. In the second half of June, the second generation larvae hatched. The second-generation adult feathered in late July, and the third-generation larva appeared in late August. In late September, the third-generation larva matured into the bark or tree-hole phlegm and winter. The second and third generation larvae also harm the fruit in addition to harming the leaves. Control methods: First, killing cockroaches, using bark scraping, blocking tree holes and other methods to eliminate wintering cockroaches. The second is to trap and kill adults, and use black light to induce adults in the adult period. The third is drug prevention and control: do a good job in measuring the insects, master the hatching period of each generation of larvae, and then spray the medicine. Generally, the first generation sprays once, and the severely injured ones spray twice, at intervals of 1 week, the medicament has 50% marathon emulsion. 1500 times liquid, 50% monocrotophos 1000 times liquid, etc. Jujube ruler. The jujube is also known as the jujube, and the larvae harm the jujube buds, leaves and jujube flowers. Control method: 1 adult insects are in the base pile 30-50cm cone sand pile, or use plastic film around the base of the trunk to prevent the wingless female moth from crawling on the tree, and deal with the female moth under the tree every morning. 2 kill the eggs, tie a circle of grass rope under the plastic film belt around the trunk to attract female moths to lay eggs. Change the straw rope once every half month from the date of adult emergence, replace it and burn it, so replace it 3-4 times Just fine. 3 Digging: Before the adult is feathered, the wintering cockroach is excavated at a depth of 1-3 cm in the range of 1 m around the trunk. 4 chemical control, the agent can be used 75% phoxim emulsion 3000 times solution or 90% trichlorfon 1000 times solution.
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