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What are the common diseases of pear trees in spring? How to prevent it?
Spring is the key period for pear trees to grow. In the meantime, we should do a good job in the prevention and control of pests and diseases in pear trees.
Today, Bian Xiao will summarize the control methods of common diseases and pests of pear trees in spring.
Control methods of pear scab
When the air temperature reaches 15℃, the inflorescence is controlled with 32.5% azoxystrobin difenoconazole gel suspension 3000-5000 times or 40% myclobutanil water dispersible granule 600-800 times, and the second control is carried out 10 day after flowering, and then every 10.
Pay attention to observation. When 3 ~ 5 leaves are found in the whole garden from May to July, spray drugs in time to prevent diseases.
From the end of June to the beginning of July, early-maturing pears, especially Yumen pear orchard, should pay special attention to the infection of scab. If it is not prevented in time, the disease will form black mold layers of different sizes on the fruit surface, which will make the fruit lose its commercial value.
Control methods of pear black spot disease
When the temperature reaches 65438 05℃, both scab and black spot are easy to occur, but the onset temperature of black spot is 3 ~ 5℃ higher than scab. Therefore, the two diseases can be controlled together when the temperature reaches 18℃.
Pay attention to garden cleaning, cut off diseased branches, pick up diseased fruits on the ground and trees, and burn or bury diseased leaves.
Control methods of pear leaf spot
Pay attention to the application of organic fertilizer and the supplement of medium and trace elements.
Pay attention to applying potassium fertilizer or spraying potassium on leaves in spring and young fruit period to improve the potassium nutrition level of trees, thicken the pericarp, enhance its toughness and reduce fruit cracking.
Spraying calcium, magnesium, boron, zinc and agricultural rare earth on the leaves before flowering, and spraying 2-3 times within 40 days after flowering.
Spraying calcium nitrate twice and 70% thiophanate-methyl (Kaituo) wettable powder 800 ~ 1000 times can control the number of diseased fruits within 10%.
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