Winter apple tree rot
Fruit rot occurs mostly on trunk or main branches. The disease damages the bark, has a long incubation period, and the pathogen spreads with the wind and rain. The disease is reddish-brown in the initial stage and the tissue is soft. The diseased skin rots and tears, like water scald. With the pressure of the finger, it is subsidence. After the lesion gradually enlarges, it turns brown and has distiller's grain taste. It is moist and moist. The late lesions gradually became dry and dark brown, with many small black spots. Afterwards, or when the weather is wet, the black spots discharge the golden curled filamentous spores and continue to spread. When the lesion spreads around the branches for a week, the upper part of the lesions will die. Lesions are expanding fastest in April, May, and August. Once they are found to cure in time, if they are delayed for several days, infected branches are likely to rot through the branches for a week. In winter, when the tree is in constant damage, the winter tree cuts do a lot of wounds, and it is difficult to heal for a while, providing an opportunity for invasion of the rot bacteria.
After the experiment, in the beginning of the winter, the apple tree was sprayed with a large concentration of antiseptics and the “General Tree Guard†had a good effect. In addition, for the wounds caused by winter cuts, timely application of anti-corrosion film to protect the wound from healing.
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