After cherry harvesting, soon into the summer, this period of pest control is one of the important tasks that can not be ignored. Summer diseases mainly include perforated leaf litter disease, glue disease, etc., insect pests mainly include mulberry white borer, peach leafminer moth, red spider, pear web bug, etc., which need to be controlled in time with effective drugs.
Cherry brown spot perforation disease: brown spot perforation disease, is a fungal disease, mainly harmful to the leaves of cherries, the initial leaves are needle-sized purple spots, and then expand into round brown spots, gradually developing to fall off into brown perforations. Rainy years occur more severely, with rapid development in June, July and August in the summer.
Prevention and control methods: drug prevention and control, conventional agents can use 70% manganese zinc wettable powder 500 times liquid, or 70% methylthiophilic wettable powder 600 times liquid and other protective fungicide spray control, the above fungicide can be alternately selected, and with 1:1:200 Bordeaux liquid alternately used. The better drugs can choose pyrimidine, isobacterium urea, oxime ester, phenoxymethoxazole and so on for prevention and treatment. At the same time, it should be sprayed once a month in combination with the occurrence of other pests and diseases.
Bacterial perforation disease: nearly circular irregular pores appear in the leaves, and the new leaves are more susceptible.
Prevention and control methods: Bacterial perforation diseases generally occur at the same time as other leaf diseases, and cherries should be sprayed in time to prevent them, and 77% of the drug solution for spraying to prevent and control other leaf diseases can be killed to obtain 800 times the wettable powder. Spray once every 10-15 days after the onset of the disease, and the effect of alternating spraying of different pesticides is better.
Mulberry white beetle: it is a shell insect that mainly harms the branches of cherries, and the needles of the mouth suck the sap of the branches, which can cause the branches to die and weaken the tree.
Control methods: In the incubation period of the first generation of nymphs in mid-to-late May, 48% chlorpyrifos emulsion 1000-1500 times liquid, 25% thiazide ketone wettable powder 1500-2000 times liquid spray or 22.4% helioethyl ester suspension 4000 times liquid can play a good control effect, spraying in mid-July and mid-September to control its second and third generations of nymphs.
Peach leafminer moth: Peach leafminer moth is generally in July-August, with the increase in temperature, the reproductive rate accelerates, the harm is aggravated, mainly harming the leaves, causing early leaf fall.
Prevention and control methods: drug prevention and control, you can choose to use sullicidal, methoxyhydrazide, urea no. 3 and other agents. If you choose to use urea no. 3, you can spray 25% of the suspension of urea no. 3 1500-2000 times for prevention and control, with an interval of 15-20 days, sprayed twice.
Red spider: belongs to the leaf mites, the damaged leaves appear gray-white green spots at the beginning, gradually become brown, severe leaves scorched, early shedding. Now the red spider has reached a high incidence period, if you do not pay attention to the control, it will affect the yield and quality.
Control method: You can choose to use 1.8% avermectin 3000 times plus 5% high-efficiency cypermethrin emulsion 2000 times, or 34% spironyl ester suspension 4000-5000 times liquid, have a good control effect.
Source: New technology for fruit tree planting