What medicine is used to treat bean rust?

Growing beans requires fertile soil, and it is also prone to diseases, among which rust is a common disease. So, what medicine is used to treat bean rust?

What medicine does bean rust use to treat?

It can be sprayed with 50% trimethoprim 600 × 800 times, 50% sulfur suspensions 500 times 600 times or 70% methyl topiramate 800 times 1000 times. Spray every 8 to 10 days, 2 times in a row.

Symptoms of bean rust

Bean can be infected with pathogen in the whole growing period, but the resistance weakens and the susceptibility increases during the period from the beginning of flowering to fruiting. The disease mainly affected the leaves, and in the early stage of the disease, there were little faded yellow and white spots under the leaves, and the spots gradually increased until the whole leaf was densely covered. The yellow-brown slightly raised scab spots were formed on the back of the disease spot, that is, the summer spore pile. After the rupture of the summer spore pile, a large number of summer spores were scattered, and sometimes a black winter spore pile was formed on the old leaves in the late growth stage. The leaves are withered and yellow, the plants are short, the pods are few and small, the growth period is shortened, and finally wither and die.

3. Incidence regularity of bean rust

The northern pathogen overwintered with winter spores on the disease remains, produced basidiospores and basidiospores during germination, the basidiospores invaded the host to form a rust cavity stage, the rust spores infected bean and formed a scar summer spore pile, and released summer spores for reinfection, the disease spread and expanded, producing winter spores and winter spores in late autumn. The southern pathogen mainly passes the season with summer spores, becoming the primary infection source of the disease, and spreads throughout the year. In the north, the disease mainly occurs in summer and autumn, especially the leaf condensation and water droplets on the leaf surface are the prerequisites for the germination and invasion of rust spores. The suitable temperature for the formation and invasion of summer spores was 15: 24 ℃ and 10: 30 ℃, and the optimum temperature was 16-22 ℃. The average daily temperature is 24.5 ℃, the relative humidity is 84%, and the incubation period is 9 Mel 12 days. The bean enters the flowering and podding stage, the temperature is about 20 ℃, the high humidity day and night temperature difference dew lasts for a long time, the disease is easy to spread, no disease occurs in the seedling stage, and the disease is serious in autumn sowing and continuous cropping land. Spring planting is often more serious than autumn planting in some areas of the south.

The prevention and control of bean rust should take comprehensive control measures, adhere to the principle of "prevention first, comprehensive control", and achieve the organic combination of agricultural control, biological control and physical and mechanical control.