Occurrence and Control of Celery Leaf Spot
Celery leaf spot disease, also known as celery early blight and spot disease, is common in China and is one of the major diseases of celery. When the harm is severe, the leaves of the celery are covered with spots, causing photosynthesis to be blocked, the growth is slow, and the quality is reduced, causing direct losses to the farmers. Symptoms The celery leaf spot disease, also known as early blight, can be affected at the seedling stage and adult plant stage. The damage to the adult plant is heavy, which mainly damages the leaves and can also damage the petiole and stem. When the plant is victimized, it first develops at the leaf edge and petiole. , It gradually spread to the entire leaf. When the leaves were damaged, it was yellowish-green spotted, and later developed into a round or irregular shape. The lesion size was 2-15 mm and the central was gray-brown. After the internal tissue became necrotic, the disease became thinner. Translucent, dark brown at the periphery, slightly elevated, with yellow halos around the periphery. The lesions are not limited by the veins. When the lesions are severe, they expand and aggregate to form plaques, causing the entire leaves to yellow and die. The petiole and stem were infected, and the lesions were oval in shape. They expanded into dark brown with slightly concave spots, and when severed, the plants were allowed to fall down. Disease characteristics The optimum temperature for leaf spot disease is 22-30°C and relative humidity is 85%-95%. It is conducive to disease on wet conditions. It is prone to high temperature and rainy conditions, low-lying areas, and it is easy to develop in the case of condensation at night. It lacks fertilizer, poor drainage, and watering. Many, heavy land masses or weaker land masses are severely affected. Control methods Available 10% difenoconazole 1500 times liquid + 70% thiophanate-methyl 600 times liquid + reported agricultural vigor 750 times or 12.5% ​​myclobutanil 2000 times + 80% mancozeb 600 times liquid + Efficacy king 750 times liquid or 12.5% ​​tebuconazole + 75% chlorothalonil 600 times liquid + Jin Tailong chaffy treasure 750 times liquid, spray 5-7 days once, when serious can be added timely, 3-5 days spray Once applied, it can effectively control the occurrence. Chocolate (chocolate, also translated as chocolate), originated in central and South America, its ancestor is "Xocolatl", which means "bitter water". Its main raw material cocoa beans are produced in the narrow strip within 18 degrees north-south latitude of the equator. As a beverage, it is often called "hot chocolate" or cocoa. Oat Choco,Oat Chocolate,Chocolate Candies,Chocolate Raisin Candy JINJIANG XIEXIANG TRADE CORP., LTD. , https://www.xiexiangfoodstuff.com