What are the symptoms of carrot spot blight? How to prevent and cure?

Carrot is a kind of vegetable with high nutritional value, which is especially suitable for the elderly and children, in which carotene is high in vegetables. In recent years, the benefit of carrot planting is sometimes high and sometimes low, and the general yield is not a problem if it is managed properly. However, carrots are also more prone to diseases, such as the common carrot spot blight, which is more likely to occur in September, especially in weak growth or extensive management. So what are the symptoms of carrot spot blight? How to prevent and cure?

What are the symptoms of carrot spot blight?

If carrots suffer from spot blight, they will first appear on the leaves, with small brown, round spots. With the passage of time, slowly spread, into a polygonal spot, became light brown or grayish white, but the edge is still dark brown, there will be a lot of small black spots, that is, the conidium of spot blight. On the hairy leaves of carrots, there are generally no obvious markings, which are more obvious on the hairless side, which will cause the carrot leaves to slowly turn yellow until they dry up and fall off.

So where did this germ come from? It is through the disease body fell on the surface and soil, and then in the ground for the winter, its seeds will also carry the pathogen, can spread the spot blight. After absorbing water, the conidia gush out conidia, spread through wind, rain and irrigation water, and then invade through the stomata of the leaves or through the epidermis. The re-infection of spot blight disease is more frequent, so the disease develops rapidly. Because this germ likes the warm, humid environment very much.

Second, how to control carrot spot blight?

First, the seeds should be selected when planting carrots, because the disease can be spread through seeds, so comprehensive disinfection measures should be taken before planting carrots. Fumishuang plus new high-fat membrane can be used to mix seeds. Specific usage suggestions consult the farmers' market. This agent can drive away underground diseases and insect pests, reduce the occurrence of virus transmission, will not affect its respiration, and can improve the germination rate of carrot seeds.

Second, strengthen the usual field management. When planting carrots, you must give foot fertilizer, and then appropriate topdressing, usually you can choose phosphate fertilizer, potash fertilizer as the main fertilizer. Usually we should water scientifically and do a good job of loosening the soil after watering, so that we can control the humidity in the field. After the rain, it is necessary to drain the excess water in time, so as to avoid the occurrence of stagnant water and rotten roots.

Third, active drug treatment of spot blight, once the consequences are very serious, so usually pay attention to observation, timely medication, so as not to infect more plants.