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1, disease prevention and control of rust. The main leaves were invaded. The yellow leaves on the back of the victim's leaves appeared initially, followed by irregular green spots, which later turned into yellow-brown or yellow-brown scabs and finally dried up. Early defoliation not only affects the output of the jujube in the current year, but also affects the growth and yield in the following year. The prevention and control methods are as follows: First, advance prevention. In early July, spray twice the Bordeaux mixture 200 times, once every 10 days, and even spray 3 to 5 times. It can also be sprayed with 50% zein zinc wettable powder 500 times. The second is the use of spraying to remove the disease. The diseased tree is treated with 1000 times Triadimefon.
anthrax. The main infringement of the fruit can also infringe on the jujube head, jujube leaf and jujube stock. In the affected area of ​​the fruit shoulder or fruit waist, yellowish water spots initially appeared, gradually expanded to form yellow-brown patches, and round spots of depression formed in the middle. The lesions expanded in a contiguous, red-brown color and caused fruit drop. After the leaves become yellow, fall early. Some were dark brown brown hanging branches. Control methods: In late July to late August, 3 times spray 1:200 times Bordeaux mixture to protect the fruit, can prevent and control rust, but also prevent anthrax infection.
Jujube fruit disease. The main infringement on the fruit was mostly yellowish water-stained patches at the waist of the fruit. The pulp of the diseased part was yellow-brown and bitter. Afterwards, the diseased department turned dark brown and lost its luster. The diseased fruit gradually shrank and the skin shrank. It is known as fruit disease. Prevention: First, strengthen the management of jujube trees, increase the use of farmyard fertilizers, and increase tree vigor to improve the disease resistance of jujube trees. The second is to do a good job Zaoyuan health, reduce the source of the disease. The third is timely drug control. From the beginning of early August or early onset, spray 50% of the DT fungicide 500 times, or anti-funin, streptomycin and other agents, spray once every 7-10 days, and even spray 3-4 times.
Jujube disease. The disease is a devastating disease. Root disease showed clustered roots, and the roots emitted several clustered roots and small seedlings. The incidence of shoots was clustered with small branches; leaf disease first yellowed leaves, after which the entire leaf was yellow, the edges of the leaves were rewinded, and they were prone to scorch. Diseased leaves fall off; fruit surface color uneven when uneven, uneven, unbearable, easy to drop fruit. Prevention: 1 Thoroughly dig out the diseased trees and the root cause, and burn them in time. 2 Do a good job of quarantine, cultivate disease-free seedlings, and use disease-resistant varieties and rootstocks. 3 Anti-insect vectors: weeds are eliminated and insecticide breeding sites are reduced. In the late June to mid-September, 4 emulsions are killed to prevent insecticides.
2 Insect pest control peach borer. Commonly referred to as "heartworm", larvae invaded the fruit damage, occurred 1-3 generations a year, mainly to 2 generations. After the larvae have fallen into the fruit, they can dive under the skin. After licking into the date nucleus, the larvae were old and mature after 17 days in the fruit, and the fruit plucked into the soil. The first generation of larvae occurs from late July to early August and the second generation larvae occur from late August to early September. Prevention: First, prevention and control in advance, in the wintering larvae unearthed on the ground under the canopy of the tree, the overwintering larvae are poisoned, common agents are: 50% phoxim emulsion. The second is spraying pesticides in time when pests occur, strictly controlling the timing of spraying, focusing on killing eggs and newly hatched larvae. Commonly used drugs include: 50% killer pine emulsion 1000 times, and 2.5% desmear emulsion 2500 times. 20% of chrysanthemum milk emulsion 2500 times and so on.
Jujube armyworm. Juvenile Mythimna separata, also known as leaf-worm, larvae feeding in the inner leaf, from mid-May to early June, mature and phlegm in the leaves, in mid-June, the first generation of adult emergence. In the second half of June, the second generation larvae hatched and hatched. The second-generation adult emerged in late July and the third-generation larvae appeared in late August. In late September, the third-generation larvae matured into the bark or tree borer and overwintered. The second and third generation larvae harm the fruits in addition to the leaves. Control methods: First, eliminate fleas, take scraping bark, blocking tree holes and other methods to eliminate overwintering lice. The second is to trap adult worms and use black light to induce worms during adulthood. The third is drug control: do a good job of insect monitoring and control, to grasp the larvae hatching period of each generation, and then spray, generally 1 generation of spraying 1, severe damage sprayed 2 times, interval 1 week, pharmaceuticals have 50% of the marathon emulsion 1500 times liquid, 50% of monocrotophos 1000 times liquid and so on.
Jujube feet. Also known as jujube zibuga, larvae harm jujube buds, leaves and jujube flowers. Control methods: 1 before the emergence of adults in the base of the pile of 30-50cm heap of conical sand, or with a plastic film around the base of the trunk to prevent the wingless female moth crawling on the tree every day early treatment of female moth under the tree. 2 Kill the eggs, tying a circle of grass ropes under the plastic film straps around the trunk to lure the female moths to lay eggs. Change the grass rope every half month from the day of emergence of adult worms, replace it and burn it, then replace it 3-4 times. You can. 3 Digging crickets: Before the emergence of adult eclosion, digging over 5-10 cm deep in the range of 1m around the trunk is overwhelmed by wintering and concentrating. 4 chemical control, pharmaceutical agents available 75% phoxim emulsion 3000 times or 90% trichlorfon 1000 times.
Diseases and Insect Pests Prevention Technology of Dazao Jujube
Xuezao jujube is a new jujube tree with strong adaptability. It is big (the largest one is 100g), and it is late mature. Extensive management, strong adaptability, China can be planted in North and South. The prevention and control techniques of common diseases and pests are briefly introduced.