Pear tree diseases mainly include black star disease, ring disease, rot disease and black spot disease. Some orchards can also cause rust, powdery mildew , brown rot, root disease and yellow leaf disease. Some orchards occasionally develop rot, old Wood rots often occur in pear trees. In order to effectively prevent and control the occurrence of pear tree diseases, comprehensive prevention and control of pear garden diseases must be done well.
The specific measures have the following four points:
First, do a good job in the health of the orchard, eliminate the defoliation of the overwintering bacteria source until the germination, first tree under the tree, thoroughly clean the leaves, disease and fruit, etc., concentrated deep buried or burned (invasion rot fruit can not be buried). Thoroughly cut off all the dead branches of the tree and destroy them collectively. Before germination, spray the fungicide 40% Fumei arsenic 100 times solution and kill 500 times liquid or 75% sodium pentachlorophenol 200 times solution to remove all kinds of overwintering bacteria remaining on the tree. In the area where pear rust occurs, completely remove the host cypress, or completely remove the teliospores on the cypress before germination, or spray 2-3 waves of sulphur or 1 mile on the cypress before the spring rain. A mixture of sulphur mixture and 75% sodium pentachlorophenol sodium 300 times to prevent germination of teliospores. Thoroughly scrape all kinds of pathogens on the wood rot tree and destroy them centrally. From late April to late May, the tour looked for black spot disease, and found it in time to cut it off and burn it or buried it.
Second, strengthen cultivation management, strong tree disease prevention and rational fertilization, increase application of organic fertilizer, avoid partial application of nitrogen fertilizer; reasonable irrigation, timely drainage in the rainy season, timely irrigation in early spring, increase the water content of the tree, improve the ability of the tree to resist rot; The amount of results, enhance the tree potential. Yellow leaf disease and lobular disease occur in heavier orchards, combined with autumn fertilization, and appropriate amount of ferrous sulfate and zinc sulfate. Pay attention to the application of the drug to protect a variety of large mechanical wounds, such as cutting, slashing, splitting wounds, etc., to prevent wood rot fungus infection. After the fruit is fixed, the fruit is bagged to prevent fruit diseases.
Third, the treatment of branch diseases began in late March, pay attention to the inspection and treatment of rot lesions, and timely drug protection, specific methods and effective agents see above. Scoring the diseased spots in time before germination, and applying medicine. After the wood rot tree scrapes off the fruiting body, pay attention to the application of the medicine to protect the wound.
Fourth, timely detection and treatment of root disease Pear germination and flowering, timely inspection and diagnosis of root diseases, and timely symptomatic treatment.
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