What to Do About Cilantro Leaf Spot Disease
Cilantro is a fairly common garnish in daily life. People who like it put it on everything they eat, while people who dislike it feel nauseated just from smelling it. Cilantro encounters all kinds of problems during cultivation, and leaf spot disease is one of the most common diseases of cilantro. So what harm does leaf spot disease actually do to cilantro? How should it be prevented and controlled? Below, the editor will take a look at it together with everyone.
1. Harm of Infection
Leaf spot disease mainly affects the leaf stems. When the leaves first become diseased, brown irregular spots appear on the leaves. These spots continuously develop and spread, spreading from the edges all the way to the center. Attached to these spots are some small black grains, and these small black grains are the pathogens of leaf spot disease. When the disease develops severely, all the patches merge until they cover the entire leaf, causing the whole leaf to dry up and finally die. When the petioles and stems become infected, strip-shaped patches appear on the diseased stems, and the patches feel sunken.
2. Causes of Onset
Leaf spot disease mainly occurs under conditions of relatively high humidity and abundant moisture. This situation causes the fungal spores to germinate, and after producing germ tubes, they directly penetrate the epidermis through the stomata and enter the inner layers. This disease is a high-temperature and high-humidity disease. Relatively high temperatures and relatively high humidity are more favorable for bacterial germination. Generally, under conditions of about 20-25 degrees and continuous rainy weather, the incidence rate increases. In addition, if the temperature difference between day and night is too large, and the temperature is too high or too low, cilantro will develop poorly, causing cilantro's own resistance to decline and increasing the incidence rate.
3. Prevention and Control Methods
(1) Seed selection: When selecting seeds, choose varieties that are disease-free or have relatively strong disease resistance. In addition, seeds carrying pathogens can also be disinfected before sowing. Put the seeds into warm water at about 50 degrees and soak them for half an hour. During soaking, continuously stir the seeds so they are heated evenly. After soaking, put the seeds into cold water to cool them quickly, then remove them, dry them in the sun, and sow them.
(2) Strengthen management: The cilantro field should be chosen as a plot with flat terrain, loose soil, and fertile soil, and it should face away from the sun and be well ventilated. The planting density must not be too dense or too sparse, and thinning and weed removal should be done in time. Pay attention to the permeability of the field, reduce humidity, and there must be no standing water in the field.
(3) Pesticide control: When infection is found, in the early stage use agents such as Ridomil wettable powder or enhanced metalaxyl wettable powder for spraying control, once every other week, for one month, and stop using the pesticide one week before harvest.
The above is a brief introduction to the main harms of cilantro leaf spot disease and its prevention and control. Leaf spot disease is also relatively contagious, so attention should be paid to promptly clearing diseased plants and disinfecting the soil. Cilantro does not have only this one disease; there are many others. The editor just picked a relatively common disease to explain, hoping this article can be of some help to everyone, and please continue to follow Qinnong Web!