The reddish-brown liquid on the trunk of the apple tree oozes out and is cut in layers with a knife. It can be found that the lesion is water-stained and appears brown or dark brown. Most of the lesions are only in the epidermis. Deep to the xylem. According to the symptoms of the disease, the disease is apple ulcerative dry rot.
Apple dry rot disease is a common disease, divided into two kinds of ulcers and branches. Ulcerative dry rot generally only harms the large branches of apple trees. Generally, there are two incidence peaks in a year, from May to June and from September to October each year. The early onset of ulcerative dry rot in apple disease is mainly caused by climatic factors: high temperatures in early spring, dry air, and more water lost from the trunk, creating environmental conditions for the disease to occur, and thus causing the disease to occur earlier. The debilitating tree vigor is the main cause of dry rot.
Prevention measures
Strengthen fertilizer and water management. Scientifically fertilize all year round, apply more organic fertilizer, and water in time when it is dry. Be sure to satisfy frozen water in winter.
Enhance tree vigor and reasonable load. To weaken the tree must reduce the fruit, scientific pruning, restore strong tree potential.
Timely prevention. Germ must be sprayed with 100-200 times liquid before germination. The bacteria must be clear or 200-300 times the amount of ciprofloxacin or 3,000 times Fuxing (flusilazole). From the end of June to the beginning of July, bacteria Bijing or Bikang can be used to apply the main trunk and large branches to prevent the infection.
Try not to cure branches and branches in the autumn and winter, to prevent the invasion of dry rot.
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