What medicine does pear tree need to take if it blooms and bears no fruit?

The phenomenon of secondary flowering of pear trees is widespread, and many fruit farmers are worried. Flowers that should have bloomed in the spring of the following year were opened in advance in the autumn of that year, and the amount of flowers in the following year decreased or even disappeared. When the second bloom blooms, a large number of autumn shoots and leaves will sprout, consuming the nutrients of the tree. This kind of tree will not flourish in the second year, and it is more prone to diseases, which will not only affect the output of that year, but also increase the difficulty and investment of management.

The key measure to prevent secondary flowering is to protect the leaves. Specific measures are as follows:

1, strengthen pest control. Pear net stinkbug, pear gall mite and pear psylla are the main pests that cause a lot of defoliation.

(1) The key period of pear net stinkbug control is from late May to early June. In the meantime, we should often check the orchard. When we find a small amount of pests on the leaves, we should apply the pesticide for the first time, and then apply it after 10- 15 days. The first generation of adults appeared in early June, and the later generations overlapped, so it was difficult to completely control them. Effective agents include 50% chlorpyrifos EC, Kung Fu, Enemy Killing, Dimethoate and so on.

(2) The key period of pear psylla control. Take the medicine once before flowering and once after flowering. Effective drugs such as avermectin and methamidophos.

(3) Pear leaf gall mite. The first peak appeared from May to June, and the second peak appeared from late July to August. Effective agents: urapidil, propargite, mirex and dicofol.

The main diseases causing a large number of deciduous leaves are black spot, ring rot, scab and rust. The main control period is from April to July. Effective agents: Xiansheng, Sheng Da m-45, doxorubicin, tebuconazole, fenxiuling, thiophanate-methyl, carbendazim, etc. Can be combined with pest control.

Cleaning and disinfection is the key to control pests and diseases. Concentrate on burning weeds and fallen leaves in the garden in winter to reduce the source of pests and diseases. In late February, before the trees germinate, spray 5 waves of smectite sulfur mixture +200 times of sodium pentachlorophenol. Pay attention to the trunk of the spray tree and the surrounding ground. Minimize the source of the disease.

2. Do a good job of irrigation and drainage in pear orchard. When the soil is dry, it will cause defoliation. Too much water, insufficient soil air, suffocation of new roots of pear trees and a large number of deaths will also cause deciduous leaves. Therefore, in pear orchards with heavy soil, attention should be paid to drainage in rainy season, and irrigation should be done in time when the water is insufficient to meet the water needed for the normal growth of pear trees. Cutting grass and covering on fruit tree planting line can reduce soil moisture evaporation.

3. Apply base fertilizer early and deeply. In particular, the application of organic fertilizer can not only supplement the nutrient consumption of trees, enhance the potential of the body, but also improve the ability of soil to retain fertilizer and water.

4. Pick flowers in time to reduce the nutrient consumption of trees.