Coriander has a long history of planting in China and is one of the side dishes that many people like very much. But also because the unique aroma has become a dish that many people hate. In fact, the coriander has the effect of Jianweixiaoshi, and the fruit can also be used as a medicine, which has the effect of hurricane and clearing. So what diseases will the coriander encounter during the planting process? The following small series will talk to you about the common diseases of coriander.
1. Leaf blight
As soon as the leaf blight begins to develop, it will spread to the surrounding area to the whole block, and the damage to the coriander is more serious. The disease is mainly caused by the leaves of the coriander, and the leaves become brown when the disease is affected. When the water is too much, the leaves will rot. When the condition is serious, it will invade the heart leaf along the veins, resulting in reduced yield of coriander. The cause of the disease is generally due to the presence of germs in the seed, so the seeds should be disinfected before sowing. For the management of seeds, it is necessary to strengthen the ventilation and drainage of coriander land. It was found that the disease can be sprayed with drugs such as mancozeb.
2, root rot
Root rot is mainly caused by low-lying, relatively humid areas, mainly harmful to the roots of coriander, the roots will appear brown, rotten rot, almost no roots. It was broken when it was gently pulled out by hand, and the value of the commodity was lost for this parsley. Try not to plant on wet, low-lying ground. Excessive moisture can easily lead to root rot. If the treatment with chemicals is mainly to change the nature of the soil, it can be mixed with soil and mixed with carbendazim and other chemicals, and sprinkled into the ditch before sowing.
3. Mosaic virus disease
The mosaic virus disease mainly occurs when the coriander is planted in the greenhouse in winter, and yellow leaves appear on the coriander plants. The most serious disease is mainly heart leaves. Will cause parsley to be short, no new roots and new leaves, and finally lead to wither and die. Virus-borne viruses are spread by mites and spread faster. The solution is to sterilize the seeds before sowing, soak the seeds in an 800-fold solution of 50% chlorobromoisocyanuric acid in water for about 3 hours, then drain the water for seeding. When the seedlings are grown, spray 3% acetamiprid suspending agent once a week for about one month to inhibit the activity of the virus.
4, sclerotinia
Sclerotinia sclerotiorum is the most common disease in parsley, with a prevalence of up to half. The germs can grow in the land for a long time, and the continuous cropping of the land provides a very good breeding opportunity for the germs, and there is a chance of attack in any period of parsley. It will harm the roots of the coriander, and it will always be harmed from the bottom to the top. There will be white patches on the surface, and then the surface will rot to reveal the black sclerotia. The main solution is that the source of the disease cannot be continuously cropped, and the plant is stirred with quinto-nitrobenzene and soil. Seeds can use disease-free or sterilized seeds. Pay attention to the drainage and ventilation of the coriander land, or use a chemical spray.
The above four are the more common diseases in the process of coriander cultivation. In fact, the causes of various diseases are that the coriander is not ventilated, and the reason for the humidity is mainly to pay attention to the ventilation of the coriander. It is necessary to digest the weeds and fertilize them, and disinfect the seeds as much as possible before sowing to reduce the incidence of diseases and reduce losses.
This article URL: Common disease maps and control methods of coriander cultivation
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