How to treat rotten roots and dead seedlings of beans

Rotten roots of beans do great harm to beans, which can occur from seedling stage to harvest stage, mainly infecting roots and vines. The root is sick, showing typical root rot, the main root, lateral root and stem base turn brown and rot, and the diseased part is slightly sunken, which can lead to dead seedlings. So, how to treat the rotten roots and dead seedlings of beans?

First, how to treat the rotten roots and dead seedlings of beans?

The root can be irrigated with 12.5% carbendazim solvent 200g 300 times, 12.5% Zhiweiling water agent 200kg 300 times, 60% Fangmaibao wettable powder 500 times, 50% carbendazim wettable powder 500 times, 40% carbendazim wettable powder 500 times 600 times, 70% dimethazone wettable powder 800 times 1000 times or Gaoyanling 500 times 600 times, each plant with 250 ml of medicine solution, once every 10 days.

2. control methods of other common diseases of beans.

1. Fusarium wilt

Disease characteristics: Fusarium wilt mainly harms the roots and leaves of beans, the disease will begin in the lower part of the plant at the initial stage of infection, water-stained patches will appear on the leaf edge, and the plaques will gradually expand and extend, until finally the whole leaves unite to form the whole plaque, and finally the leaves die. And cracks will begin to appear in the rhizome, the color will gradually become darker, the external humidity is too high and mildew spots will appear on the plaques.

Control methods: continuous cropping can not be carried out on the same piece of land, at least two-year rotation should be guaranteed, and the crop rotation should not be legume crops. Improve the soil, neutralize the acidity of the soil and reduce the pathogen. After the onset of the disease, carbendazim wettable powder and other drugs can be used for prevention and treatment, the dosage depends on the incidence of the disease, at least once a week, lasting for one month.

2. Virus disease

Disease characteristics: virus disease mainly harms the leaves of beans, leaves infected with the disease will appear in the part of the leaf color deepening, the sick place will appear uneven phenomenon, and then begin to bend. Virus disease will delay the time of flowering, the time of flowering is uneven, the rate of pollination and fertilization is seriously reduced, which has a great impact on yield and may even lead to sterilization.

Control methods: when selecting varieties, we should choose disease-free and harmless varieties with strong disease resistance, observe more in the planting process, strengthen the use of chemical control, and improve the resistance of beans. As the main transmission is aphids, aphids not only spread viral diseases, but also have a great impact on crops, so we should also pay attention to the prevention and control of aphids. Reduce the transmission of pathogens and reduce the incidence.

3. Bean rust

Disease characteristics: bean rust is mainly harmful to the leaves, when the leaves infected with bean rust will appear colored patches on the leaves, with the passage of time, the color will gradually deepen, the affected part will also begin to protrude. The protruding place is the pathogen spore, and the red powder will appear after the seed coat surface is broken.

Prevention and control methods: after harvesting the first crop of beans, carry out comprehensive disinfection in the orchard, destroy the diseased body, stay away from the vegetable garden and avoid re-transmission. Select the varieties with strong disease resistance and carry on the pesticide prevention to the plant appropriately.

When planting beans, if the disease is serious, it will affect the yield, so we must do a good job in prevention and strengthen the management in the garden.