Late ripening peaches have significantly improved their taste and sugar content compared with early ripening peaches and medium-ripening peaches. But the cycle of producing high-quality fruits is longer, the cost of input by growers is higher, and the risk of planting is higher. Coupled with the grower's technical and management can not keep up, the disease and pest are serious, resulting in a decline in the yield of high-quality fruits, and the serious almost extinction. Thus, among the majority of growers, there is a saying that "late peaches are delicious, but trees are difficult to manage". So, what are the main aspects of late ripening peaches?
1. Selection of varieties
Growers do not have a good understanding of late-ripening peach varieties, believing that as long as they are excellent varieties, they can do it. However, it does not take into account whether the regional climate, soil and other conditions are suitable.
2, management technology can not keep up
Do not understand the technology, see how others do what they do, it is easy to cause delays in agricultural activities or miss the best period for the placement of pests and diseases.
3, the sales concept is backward
Only the pursuit of yield and ignore the quality of the fruit, the load is too high can easily cause the tree to weaken, thereby exacerbating the outbreak of pests and diseases, and the consequences are endless.
<h1>Late peaches are common pests in the later stages</h1>
Biocontrol:
There are several kinds of parasitic wasps of peach heartworm, especially the peach small early abdominal cocoon bee and the Chinese tooth leg wasp have a higher parasitism rate. The peach beetle-bellied cocoon bee lays eggs in the peach eggs, parasitizes the larvae in the peach larvae, and is eaten when the peach overwintering larvae emerge as a cocoon. Therefore, at the peak of the generation of adult insects, small parasitic wasps of peach can be released. During the initial incubation of the larvae, a bacterial pesticide (BT emulsion) is sprayed to cause the peach to die of disease. Peach small sex attractants can also be used to trap adults during the overwintering generation.
chemical control:
1. Ground prevention and control. Sprinkle poisonous soil: use chlorpyrifos granules 2 kg or 50% octylthion emulsion 500 g with fine soil 15-25 kg to mix well, evenly sprinkle on the ground under the trunk of an acre of land, and use a hand rake to mix and level the medicinal soil with the soil. Octyl thion can be used once; Chlorpyrifos can be applied 2-3 times in a row. Ground spraying: Use octyl thiophos to spray the wet surface before the overwintering larvae emerge, and rake the surface. 2. Tree prevention and control. The appropriate period for control is the initial incubation period of the larvae, and the spraying of larval urea has a strong tactile killing effect on the eggs and hatching larvae; It is also possible to spray 20% permethrin emulsion 2000 times liquid, or 10% cypermethrin emulsion 1500 times liquid, or 2.5% cypermethrin emulsion 2000-3000 times liquid. Spray again after a week to achieve good control results.
Prevention and control methods:
1. Scrape off the old bark during the dormancy period and burn it, and remove some of the overwintering larvae;
2. When the larvae are near the stinging stage, the saw opening is closed with bifenthrin to reduce the source of insects;
3. Manual removal of "insect packs" from May to June for centralized destruction;
4. Booby trap in the apple orchard hanging sugar cheese jar during the adult occurrence period. The ratio of sweet and sour solution is 1 part for sugar, 3 parts for vinegar and 10 parts for water.
5. 2000 times solution for killing young urea, 3000 times liquid for avermectin, and 3000 times liquid for imidacloprid are sprayed alternately for prevention and control.
1. Eliminate the body of overwintering insects: in combination with the clearing of the garden in winter, scrape the coarse old skin on the trunk, and burn or bury it in a concentrated manner along with the cleaned peach leaves and weeds.
2, the use of sexual trapping agents to kill adult insects: choose a wide-mouth container, fill the water to the edge of 1 cm, add a little laundry detergent to the water, and then use a thin wire string containing peach leaf moth adult insect exohormonal preparations of the rubber core, fixed in the center of the container mouth, that is, a trap. The trapper is hung in a peach orchard at a height of 1.5 meters above the ground. 5 meters, 5-10 hanging per acre. Summer temperatures are high and evaporation is large, so it is necessary to often rehydrate the trap and maintain the height of the water surface. Hanging traps can not only kill male adult insects, but also predict the extinction of pests and guide chemical control.
3. Spraying within 3-7 days after the peak of the overwintering and the first generation of male adults can obtain the desired effect. The first dose is usually after the peach has fallen, and then sprayed every 15-20 days. The drugs used are 20% permethrin 2000 times liquid, or 5% high-efficiency cypermethrin emulsion 2000 times liquid, or 2.5% kung fu emulsion 4000 times liquid.
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