I. Symptoms Verticillium dahliae generally begin to develop after the fruit of the eggplant and fruit set in the initial stage of the disease, and enter the full fruit period, and the diseased plant increases dramatically. At the early stage of disease, it occurs on the middle and lower leaves of the plant, and starts at the edge of the tip or near the tip of the leaf. The chlorosis turns yellow between the veins and gradually develops to the side or the entire leaf turns yellow. The diseased leaves in the early stage were wilted before and after noon on sunny days or when the weather was dry, and returned to normal on cloudy or rainy days. The chlorosis part of the veins in the late period turns from yellow to brown, and the lesions are limited to half of the leaves, causing the leaves to twist, sometimes on the same plant, the plant shape does not stretch. In severe cases, the whole plant leaves dry. Peel the roots, stems, branches and petiole of the cortex, visible vascular yellow brown or brown, it is also known as black heart disease. The diseased fruit became smaller and harder, and the long solanaceous fruit was sometimes curved. China leading manufacturers and suppliers of Active Pharmaceutical Ingredient, Mupirocin , Mupirocin Calcium, and we specialize in Sodium Fusidate, Fusidic Acid. Active Pharmaceutical Ingredient, Mupirocin, Mupirocin Calcium, Fusidic Acid, Sodium Fusidate Manufacturer Fuzhou Contay Biotechnology Co., Ltd , https://www.contaybio.com
Second, the onset of conditions Temperature is an important factor affecting the occurrence of diseases Generally, the temperature is 20-25 °C, more rainy, high humidity conditions, the incidence of heavy, the temperature is above 28 °C, the incidence of inhibition. From the time of eggplant colonization to the flowering stage, the number of days with an average daily temperature of less than 15°C is more, and the earlier and more severe the onset of disease. If the rains are tempered during this period, the weather is warm and the disease is significantly reduced. The main reason for the low temperature incidence is that the root wound caused by colonization is not easy to heal, and it is beneficial to pathogenic bacteria.
Third, prevention and control methods 1, selection of disease-resistant varieties. 2. The seed is sown with a warm soup soaking method. 3. Implement a 3-4 year rotation system. 4, seriously ill in the ground before the spread of carbendazim per acre 6 pounds, turning it into the soil, control effect is good. 5, during the onset of disease with 70% of enkeson 1000 times or 50% carbendazim WP 500-1000 times Irrigation root, the amount of each strain of 0.5 kg, the prevention and treatment of the disease have a certain effect.