First, the origin and spread of autumn, the fruit tree spores produced spores, with the spread of wind and rain to the host plants on the winter. In the spring of the next year, the germs will then be transferred to the fruit trees that have sprouted long leaves with wind and rain. The yellow spots that we see on the leaves of fruit trees are called rust spores. It can directly harm the leaves fruit and shoots.

Second, the onset condition is temperature and humidity. When the daytime temperature stabilized above 12°C, the apple germinated, and the germs began to spread. If the climate is dry during this period, the incidence is low and the spread is slow; if it encounters wind and rain during this period, it will spread quickly and have a high incidence rate. The disease is transmitted once a year at the peak of infection, which is in mid-April to late May of each year. When the temperature exceeds 30°C after mid-June, the rate of transmission of germs rapidly declines, and reinfection does not generally occur. Therefore, in the prevention and control should seize the key, early prevention and treatment, do not wait for the symptoms before passive treatment.

Third, the prevention and control measures 1. The main prevention in the early stage. Fruit trees sprout to the red period, mainly based on protective agents, supplemented by therapeutic agents. The main purpose is to protect the new leaves with protective mancozeb and propinol zinc to prevent the invasion of germs. At the same time, high-quality azole pesticides are used to kill the bacteria that have invaded the leaves.

2. The main treatment of late. The first time after the apple has been spent, the apple must use high-quality azole pesticides to eradicate the bacteria that have invaded the foliage. Medications are mainly carbazole and oxazol, and care should be taken not to increase the concentration of the drug and prevent phytotoxicity. At the same time with a protective agent to prevent bacteria from infecting new leaves.

3. Pay attention to listening to and watching the weather forecast of TV broadcasting, and strive to use drugs before the rain and premedication. To seize the favorable opportunity of the initial infection, we can prevent and treat the disease in a cost-effective manner.

4. Real-time medication, careful medication, comprehensive medication. Drug use in real time means that the timing of prevention and treatment must be tightened. Do not miss out on the most favorable prevention and control opportunities and eradicate germs in the bud. The meticulous use of medicine is to spray carefully and evenly, without dripping or spraying. Leaking spray, there are too many legacy sources, there is still the possibility of disaster hazards. Not re-spray is because azole pesticides are not safe, re-spraying means increasing the concentration, easy to produce phytotoxicity. Comprehensive drug use means not only seeing fruit trees before spraying, but also spraying the host plants around the orchard to minimize the source of the disease.

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