Recently, a relatively serious brown rot occurred in some apricot fields in the south-central part of Hebei Province, and attention should be paid to inspection and treatment.
First, the symptoms of symptoms Apricot brown rot is a common disease on the apricot tree, the main harm to the fruit, from the young fruit period can be infected. In the early stage of disease, red-brown round lesions appear near the fruit tip of the fruit, which are slightly sunken and the lesions spread rapidly. The diseased fruit that was harvested will sag overnight, showing dark brown rotting, and a gray moldy layer grows on the surface.
Second, the incidence of law Apricot brown rot disease in the usual fruit in the near maturity of severe fruit. The pathogenic bacteria mainly overwintered with mycelium in the diseased fruit, and a large number of conidia were formed in the spring of the following year. They were transmitted through wind and rain or insects, and invaded through wounds or natural orifices, causing morbidity. Under suitable climatic conditions, a large number of conidia appear on the surface of the diseased part to re-infect. Low temperature and rain during flowering are beneficial to the formation and intrusion of conidia, which may cause flower rot and leaf rot. During the ripening period of fruit, if it is warm and rainy and there are many wounds, it is prone to fruit decay. The meteorological conditions in the spring this year were suitable for the early occurrence of brown rot.
Third, control methods
1. Agricultural control. Through balanced fertilization, reasonable pruning, and moderate load, the tree grows robustly and improves disease resistance.
2. Reduce the source of the disease. In combination with the winter shears, the stiff fruits on the trees are thoroughly removed, and the fallen leaves and fruit are cleared and burned in the spring.
3. Chemical control, spraying 5 Baume degree of lime sulfur before germination in early spring; Begin to use 80% of apricot trees to drop flowers, 80% of big-time students use 800 times liquid, 68.75% of easy-to-use water dispersant 1000 times, 50% Carbendazim WP 600 times, 70% thiophanate-methyl 800 times, 50% euphoria WP 1500 times, 50% Procyanidine WP 1500 times. Brown rot can damage the fruit before harvesting, and the disease mainly occurs in the middle and late stages of fruit growth. Therefore, the fruit must be controlled 2 to 3 times before fruit harvest. Among the above-mentioned agents, the first two agents are mainly prevention, and the latter four agents are mainly treatment, and can be alternately applied according to climate conditions.
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