What are the control methods for mung bean ring spot?
Mung bean ring spot not only infects mung bean, but also harms adzuki bean, common bean, broad bean and others, causing brown spot disease to develop. It mainly damages leaves, making them unable to function normally, and has a relatively large impact on yield. So how should mung bean ring spot be controlled? Follow the editor and take a look.
1. Symptoms
Mung bean ring spot mainly damages leaves and can infect the plants as soon as they emerge, but it occurs more often in the later stages. When leaves are infected, brown circular lesions first appear, with reddish-brown edges, and obvious concentric rings appear on the lesions. Later, many small brown dots appear on the lesions, namely pycnidia. The lesions break apart very easily when dry. In severe cases, the disease causes early leaf drop, affecting pod set, and individual plots suffer severe damage.
2. Occurrence pattern
The pathogen of ring spot overwinters or oversummers as mycelium and pycnidia in diseased parts or in the soil with diseased plant residues. The conidia spread by rain splash and cause primary infection. After parasitizing the plant, they multiply rapidly and, after forming pycnidia, spread again. Warm, humid weather, or excessive dense planting with high humidity between plants, all favor the occurrence of this disease. Plants with excessive nitrogen fertilizer and overly vigorous growth, or plants lacking fertilizer and growing weakly, will both experience reduced disease resistance, leading to more severe disease later.
3. Control methods
Mung bean ring spot can infect plants as soon as they emerge, so agricultural control should be done well. After harvest, the field should be thoroughly cleaned, and weeds and diseased residues should be collected and burned to reduce the pathogen base. Before sowing, the soil should be deeply plowed to eliminate underground pests, and then quicklime should be spread once to achieve disinfection and sterilization and reduce the incidence rate as much as possible. In the early stage of the disease, Bordeaux mixture 200 times or Kocide 500 times solution, as well as basic copper sulfate 500 times, can be sprayed, once every 7-10 days, for 2-3 consecutive treatments.
The above is an introduction to the control methods for mung bean ring spot. We hope it helps you. To learn more related knowledge, please stay tuned to us.