Eggplant powdery mildew

First, the symptoms of eggplant powdery mildew pathogen mainly damage leaves, old leaves and young leaves can be infected. Generally, the old leaves at the lower part of the plant come on first and develop gradually. At first, the lesions were pale yellow spots, and then gradually expanded and covered with white powder. Many diseased spots are connected together, so that the whole leaf is covered with white powder, and the leaf gradually turns yellow from green, losing photosynthesis, and finally the leaf dries up and dies.

2. Pathogenic conditions of eggplant powdery mildew When the temperature is 16-24℃ and the humidity is about 75%, the disease is most likely to occur and spread; Plants are planted too densely, with poor ventilation and drainage, weak growth and serious diseases; In the middle and late period of plant growth, leaves are gradually aging, which is the most prone to disease.

Third, control measures of eggplant powdery mildew

1, plant regulation. Shaping, pruning and leaf picking are beneficial to ventilation and light transmission, reducing the occurrence of powdery mildew, improving fruit setting rate and improving quality. Therefore, in the middle and late stage of eggplant cultivation, it is necessary to prune and pick leaves, remove old leaves, residual leaves and leaves of diseases and pests in time, cut off slender branches, and immediately clear the picked branches out of the garden and burn them centrally.

2, timely eliminate the water. After the rain, it is necessary to thoroughly remove the accumulated water in the border ditch, reduce the humidity in the field, keep the soil dry and reduce the incidence.

3. Rational fertilization. The base fertilizer is sufficient, eggplant is a vegetable that likes potassium and calcium, and there is a great demand for potassium and calcium in the middle and late stage of eggplant. Therefore, on the basis of timely supplementary application of certain nitrogen and phosphorus fertilizers, adequate application of potassium and calcium fertilizers, and timely spraying of foliar fertilizers containing phosphorus and amino acids under the conditions of long-term cloudy days and insufficient sunshine are beneficial to strengthening plant growth, improving photosynthetic efficiency of leaves and improving disease resistance.

4. Remove seriously ill strains. When individual seriously ill eggplant plants are found in the field, we should dare to take action, remove the whole seriously ill plant in time, clear out the vegetable garden, burn it centrally or bury it deeply, and reduce the source of germs.

5, spraying prevention and control. In the early stage of eggplant powdery mildew, we can choose: ① 800 times dilution of 50% thiophanate-methyl wettable powder; ②25% triadimefon wettable powder 1, 500-2,000 times dilution; ③ 800- 1000 times dilution of 50% carbendazim wettable powder; ④ Triadimefon EC is 2000 times; ⑤25% ethirimol SC 800- 1000 times. Spray every 10 day 1 time, and spray continuously for 3-4 times. Pay attention to the alternate use of the above pesticides.

Welcome everyone's attention and evaluation.

I wish you success in your work and good health!