Apple tree disease prevention and control is not a lot of times, the key is to play well, that is, the use of biological pesticides in the critical period of disease prevention. In order to do this, we must understand the law of the occurrence of major diseases in production. After that, according to the law of occurrence, the drugs should be used early in the most sensitive period of the disease, and the bacteria should be controlled in the non-germinated or uninfected condition, achieving a half-time effect.
Brown spot disease is overwintering on the leaves with hyphae or conidia discs. In the second year of spring, from April to May, when rainy, a large number of conidia are produced (monotonous and erosive leaves have no ability to produce conidia), and The rain splash infects the leaves near the ground. From May to June, the disease occurs at high temperature and high humidity. From July to August, there is a large wholesale disease. After the temperature drops in October, the damage is stagnant, and the ambush period is 13-55 days.
Freckle deciduous disease is overwintered by hyphae in the affected leaves, shoots and bud scales. In the second year, conidia are produced in spring, with airflow and wind and rain spreading, and infection occurs at 7-10 days after flowering, and in May-June and August. High temperature and large wholesale disease. The spores of the diseased leaf pathogens formed in late April to early May, and the branches formed in July.
The ring disease is also called rough skin disease and round brown rot. Mainly harmful to branches and fruits. The fungus is overwintered in the mycelium of the mycelium. In the second year of March-April, the branches are infested with rainwater, and then the fruit is infested. Infested young fruit from June to July, but not onset. When the fruit encounters high temperature and drought in the near maturity period, the disease is heavier. The pesticide network suggests that the peak of the disease is 1 month after harvesting. The stem disease is formed by the lenticels as the center of the oblate reddish-brown lesion, the central protrusion is a tumor, the edge of the disease is cracked, and black small particles are produced in the middle of the second year. The fruit is infected with a water-stained pale brown dot (red dot) centered on the lenticels. After expansion, it forms a shallow, dark-brown concentric pattern, and there is a brown-brown mucus overflow. The whole fruit is quickly smashed and gives off a sour smell. taste. The pre-growth rain is mostly early onset, and the high temperature and drought in the mature period is serious, and vice versa.
Anthrax mainly damages the fruit. The pathogens overwinter in the mycelium in areas such as stiff fruit, fruit moss, dried lychee and branch breaks. In the second year, the conidia spread by rainwater and insects, invading the fruit through the lenticels, and infecting many times. Usually, from late May to early June, the invasion and dyeing period will occur. From July to August, high temperature and high humidity will be the peak period, and the disease will appear in large numbers. After the onset of the fruit, it is initially a brown round spot, which turns into a dark brown (or black) lesion and sag, and the central protruding black small grain points are arranged in a concentric pattern. It occurs severely when it is hot, humid, or rainy. The orchard is closed and low, and the ventilation and light transmission are not easy to occur.
In short, China Pesticide Network believes that prevention of diseases must seize three key periods: First, the work of clearing the garden in winter and spring, and the occasion of damage to the bacteria over the winter, reducing the winter base of the bacteria. The second is to strengthen the drug protection 3 to 5 days after flowering until the fruit is bagged to avoid the infection of the bacteria. The third is to pay attention to climate change, to spray before the rain, to avoid the spread of germs.
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