Cilantro planting: what is cilantro leaf spot?

What is cilantro leaf spot? What harm does leaf spot disease do to coriander? Please introduce and control the harm of cilantro leaf spot: leaf spot is mainly harmful to leaves, petioles and stems, leaves infected with primary olive color to brown, irregular or nearly round spot, obvious edge, central gray after expansion, small black spots on the spot, that is, the fruiting body of the pathogen. In severe cases, the disease spots fuse into pieces, causing the leaves to dry up. Petiole and stem infected, the spot is striped or long oval brown spot, slightly sunken. The cause of parsley leaf spot disease: under the condition of high humidity and water droplets, the conidia germinated and invaded from stomata or directly through the epidermis after bud tube was produced. The disease is a high-temperature disease, warm and humid is beneficial to the disease, and the disease is serious under 20-25 ℃ and rainy conditions. In addition, sunny during the day, condensation at night, or high or low temperature or too high or too low lead to poor host growth, decreased disease resistance will make the disease occur or epidemic. Control methods of cilantro leaf spot: 1. Select disease-free seeds or disinfect seeds: if the seeds are infected, soak the seeds in 48-49 ℃ warm water for 30 minutes and stir continuously to make the seeds heated evenly. After soaking the seeds, quickly cool them in cold water and sow them after drying. 2. Strengthen the management: the border should be flat, properly close planting, and time seedlings, weeding. Pay attention to ventilation and light, reduce the humidity in the field, and no flood irrigation. 3. Remove the residual body immediately after harvest in order to reduce the source of bacteria. 4. At the initial stage of the disease, 50% lide wettable powder 1000 times liquid or 40% synergistic Ruidui wettable powder 1000 times liquid, 50% carbendazim (carbendazim plus carbendazim) wettable powder 1000 times, 75% chlorothalonil wettable powder 1000 times, once every 7 to 10 days, continuous prevention and treatment for 3 times. Stop using medicine 7 days before harvest. Click to get more coriander planting techniques click to get more vegetable planting techniques