Pest control of cherry blossoms
1. Cherry blossom diseases and pests include mulberry white shield scale, all kinds of stinging moth, palm moth and so on.
The mulberry white shield scale is mainly distributed in the cherry blossom cultivation area, and the occurrence is common, and it is quite serious in some fields. The damage has caused the leaves to basically fall off, and the number of insect population is extremely high and dense, which can be seen as snow white in the near future. It is speculated that the first hatching stage of mulberry white shield scale should be about the end of August to the beginning of September. The newly hatched nymph stage is the best time to carry out spray control. All kinds of planting households should combine prevention and control to control the population base below the allowable economic level.
Control methods: in the nymphal stage, spray 1000 Mel 1500 times liquid, kill 1500Mel 2000 times liquid or scale miling 150Mel 200 times liquid. If the insect population density is relatively high, it should be sprayed again every 7-10 days, and pesticides should be carried out alternately to prevent scale insects from producing drug resistance. In addition, cherry trees with high population density should be pruned properly and concentrated on burning treatment to prevent further spread of insect pests.
2. Spodoptera litura is mainly distributed in the cherry blossom cultivation area, and the damage is serious in individual fields. All the leaves are eaten up, leaving only bare branches. At present, the state of insects is uneven, some larvae have entered the 5th instar (the first generation), and some larvae tend to be between the 1st and 2nd instar in the initial incubation period (the second generation). At present, it is the best time for spray prevention and control, and farmers should seize the time to carry out prevention and control work. Control the harm of insect pests.
Control agents: spraying pyrethroid emulsion 800-1000 times or other pyrethroic acid pesticides during the severe occurrence of larvae
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Cherry blossom brown spot
Cherry blossom brown spot, also known as cherry blossom brown spot perforation, is an important disease of cherry blossom leaves. It has long been reported in Japan and other countries. The occurrence of cherry blossoms is common in Nanjing, Taiyuan, Tianjin, Shanghai, Chengdu, Xi'an, Suzhou, Jinan, Changsha, Lianyungang, Wuhan, Taiwan and other provinces and cities. The perforated leaves of infected cherry blossoms not only affect ornamental, but also defoliate ahead of time and affect their growth and development. The disease also affects cherry, plum blossom, peach and other stone fruit ornamental trees. Symptom
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Prevention and control of root nodule disease of cherry blossoms
Cherry blossom root nodule disease is also known as crown cherry disease. There are more than 330 species of root nodule disease belonging to 142 genera and 59 families. It harms more than 600 kinds of plants, mainly forest plants, economic forest plants and garden plants, peaches, plums, pears, apples, roses and cherry blossoms, etc., which are easily harmed by root nodule disease. Flowers and trees infected with this disease affect the development of roots, often resulting in lack of nutrition, showing a weak state, and finally withered. Symptoms: mainly in the root neck and large root, sometimes also in the lateral root. The main symptoms are the formation of roots of different sizes and irregular shapes.
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