Bitter bitter disease and pox spot disease occur in varying degrees in apple growing areas. Both diseases are physiological diseases.
In the early stage of apple bitter pit disease, round spots appeared on the fruit surface, and then the depression of the diseased part was brown, and the subcutaneous tissue became brown and spongy and bitter. Apple pox spot first appeared on the fruit surface with a dark brown spot of varying density centered around the fruit pedestal, with a purple halo around it, and depressions in the vicinity of the consequent stage, forming a 1-2 mm brown spot.
Occurrence pattern: Both diseases are caused by calcium deficiency. Trees that grow too vigorously are heavily affected and Hanfu is a susceptible species. Control methods: Improve the cultivation and management conditions and maintain a balanced tree vigor. Prevention should be sprayed between July and September 0.5% potassium nitrate, red varieties can be sprayed 0.4 calcium chloride, spray once every 20 days until harvested. Prevention of bitter pox disease should be sprayed with 0.4% calcium nitrate solution 2 times from late June to late July. If 0.3% borax is mixed, the effect is better than single spray of calcium nitrate.
Liquid-based Cytology Screening
TCT
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