How to do the leaf spot of coriander

Parsley is a common side dish in daily life. People who like to eat should put parsley no matter what they eat, and people who don't like it will feel sick to their stomach when they smell coriander. Coriander will encounter a variety of problems in the process of planting, among which leaf spot is the most common disease of coriander, so what harm will leaf spot do to coriander? How to prevent and cure leaf spot disease? Let's take a look at it with you.

1. Harm caused by infection

Leaf spot disease mainly occurs on the leaf stem, when the leaf is sick at the initial stage, it will produce brown irregular spots on the leaf. These spots will continue to develop and spread, spreading from the edge to the center, and some black particles will be attached to these spots. These small particles are the pathogen of the leaf spot disease. When the development is serious, it will cause all the patches to merge into the whole leaf, causing the whole leaf to dry up and finally die. The infection of petiole and stem will produce striped plaques on the diseased stem, and the plaques will have a sense of depression.

2. The cause of disease

Leaf spot disease mainly occurs in the case of high humidity and more water, which leads to the spore germination of the pathogen, which will directly penetrate from the stomata through the epidermis to the inner layer. This disease is a high-temperature and humid disease, high temperature and humidity are more conducive to bacterial germination, generally in the temperature of about 20-25 degrees and continuous rainy weather. In addition, the temperature difference between day and night is too large, and the temperature is too high and too low will make the development of parsley stunted, resulting in a decline in the resistance of parsley itself and increase the incidence of the disease.

3. Prevention and control methods

(1) seed selection: the varieties without disease or with strong disease resistance were selected. In addition, it can also be seen that the infected seeds were disinfected before sowing. Soak the seeds in warm water of about 50 degrees for half an hour, stir the seeds continuously in the process of soaking, let the seeds be heated evenly, quickly cool the seeds in cold water after soaking, fish them out and dry them and sow them.

(2) strengthen management: the coriander land should be ventilated in the flat, loose and fertile soil. The planting density should not be too dense and too thin, and the seedlings and weeds should be removed in time. Pay attention to the permeability of the field, reduce the humidity, there is no stagnant water in the field.

(3) Pesticide prevention and control: if the disease is found to have occurred, the wettable powder such as lide wettable powder or synergistic Ruidui wettable powder should be sprayed once every other week for one month, and the drug should be stopped one week before harvest.

The above is a brief introduction to the main harm and control of parsley leaf spot, which is also highly contagious, so we should pay attention to clean up the diseased plants and disinfect the soil in time. Parsley is not only a disease, there are many, the editor just picked a more common disease to explain, I hope this article can play a certain help to you, and please continue to pay attention to the pro-agricultural network!