What to Do When Cilantro Gets Leaf Spot? A Detailed Guide to the Latest Control Methods
Cilantro is a fairly common garnish in daily life. People who like it put cilantro on everything they eat, while people who dislike it feel nauseated just from smelling it. Cilantro encounters all kinds of problems during cultivation, and among them leaf spot is the most common disease of cilantro. So what harm does leaf spot 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 caused by infection
The main site of leaf spot infection is on the leaves and stems. When the leaves first become diseased, brown irregular spots appear on the leaves. These spots continuously develop and spread, spreading from the edge all the way toward the center. Some small black granules attach to these spots, and these small black granules are the pathogens of leaf spot. When the disease develops severely, all the spots 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 form on the diseased stems, and the patches feel sunken.
2. Causes of onset
Leaf spot mainly occurs under conditions of relatively high humidity and abundant moisture. This situation causes the pathogen 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, high-humidity disease. Relatively high temperatures and relatively high humidity are more favorable for the germination of the bacteria. Generally, under conditions of a temperature of around 20-25 degrees and continuous rainy weather, the incidence rate increases. Also, too large a temperature difference between day and night, and temperatures that are too high or too low, will cause poor development of cilantro, leading to a decline in cilantro's own resistance and increasing the incidence rate.
3. 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. Place the seeds in warm water at around 50 degrees and soak them for half an hour. During soaking, continuously stir the seeds so they are heated evenly. After soaking, place the seeds in cold water to cool them rapidly, then remove them, dry them in the sun, and sow them.
(2) Strengthen management: The cilantro field should be chosen on flat terrain with 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. Thin out seedlings and remove weeds in a timely manner. 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, use pesticides such as carbendazim wettable powder or enhanced metalaxyl wettable powder for spraying control at the early stage, once every week, continuing for one month. Stop using the pesticide one week before harvest.
The above is a brief introduction to the main harm of cilantro leaf spot and its control. Leaf spot is also relatively contagious, so attention should be paid to promptly cleaning up 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 also continue to follow Qinnong Network!