Eggplant Ascochyta leaf spot is an eggplant ring disease of eggplant ash. This disease is one of the important diseases that affect eggplant yield and quality. It can be attacked from the seedling stage to the fruit harvest stage, often causing dead seedlings and dead branches. And fruit rot, of which the largest loss of fruit rot. During the transportation and storage of eggplant, brown rot always causes the whole heap to decay. Plasma Products,Anti-Hbs,Safe Plasma,Safe Plasma Storage Sichuan Yuanda Shuyang Pharmaceutical Co., Ltd. , https://www.syimmunoglobulin.com
Symptoms? The main damage to leaves, stems, fruits, the main damage to the fruit.
Seedlings are sick, spindle-shaped brown pits appear at the base of the stem, and there are small black particles. When the conditions are right, the lesions spread rapidly and the seedlings fall down and stand.
The leaves were damaged, and the leaves appeared greyish-white immersed round spots with a brown gradient. On the last round, many black spots were produced. The late lesions were contiguous, often resulting in perforation and shedding of leaves.
The stems were mostly victimized at the base. The lesions were spindle-shaped, brown at the edges, and depressed in the central gray, and then the dry and rot ulcers were enlarged. The black dots were dense, and the whole plant withered.
The victim initially presented a light-brown, circular depression spot, which later expanded into a dark brown, round or irregular shape. There were obvious markings on the fruit and a number of small black spots were born. The diseased fruit in the later stage rotted or still hung on the branches.
Pathogen? Ascochyta melongenae Padman said eggplant spores, a fungus is a semi-known fungi.
What are the characteristics of the disease? The pathogen is attached to the seed or the diseased body of the plant with a conidial device or hyphae, which becomes the main source of the initial infection at the seedling stage. The conidium is transmitted by wind and rain, insects or agricultural operations and can be directly from the epidermis. Or wound invasion, conidia parasites under the epidermis of the host, so that the upper part of the leaves and stems of the disease, the minimum temperature for the growth and development of pathogens is 7 °C, the maximum temperature is 40 °C, the optimum temperature is 28 °C, when the greenhouse temperature is 28 -30 °C, humidity above 80%, in the case of bacteria, it can spread in 3-5 days. General greenhouse seedbeds encounter long-term rain, low-lying, high humidity, high temperature, poor ventilation, cold air, long fog, long growth, high density, easy to disease, and heavy damage. For poor drainage, soil viscosity, partial application of nitrogen fertilizer or defertilizer, sowing too early, planting too late, seedlings are seriously affected by underground or aboveground pests, replanting fields in old wards will aggravate the occurrence of brownie disease. Seed borne bacteria are the main cause of seedling blight and damping-off. They are also the medium for long-distance transmission of diseases. The pathogens in the soil and diseased bodies cause many plant stem ulcers, resulting in conidia. Further infesting the leaves, causing the leaves to develop bo?
Control methods??
1. Agricultural control, using disease-free seeds.
2. Pay attention to the humidity in the field, timely drainage and ventilation after the rain, low-humidity plots, high humidity, and proper close planting. In the often-produced plots, a 2-3 year rotation should be implemented.
3. Spray 75% chlorothalonil wettable powder 600 times or 50% thiophanate-methyl suspending agent 700-800 times, 70% mancozeb dry powder 500 times, 50% Sulphur suspension 500 times. 45% chlorothalonil smoke agent can be used in shelters, 250 g smoke per 667 square meters, and every 7-10 days, continuous control 2-3 times. The use of chlorothalonil was stopped 7 days before the harvest and the use of other bactericides was stopped 3 days before harvest.