Harmful symptoms and control methods of towel gourd powdery mildew

Towel gourd powdery mildew is a disease caused by pathogens, which is very common in the process of planting towel gourd. The disease mainly occurs in early April and late June, when the temperature is mild and the relative humidity is high. It is easy to occur in fields with poor ventilation and high cultivation density. Below pro-agricultural network to answer for you about towel gourd powdery mildew how to do related questions.

First of all, we need to understand the symptoms of towel gourd powdery mildew, and then according to the disease, this pathogen mainly harms leaves, towel gourd stems and fruits are less common, but poor leaf development will also have a certain impact on the yield and quality of towel gourd. Here is an introduction to the specific symptoms.

I. harmful symptoms of towel gourd powdery mildew

Small round powdery mildew spots appeared locally in the leaves of towel gourd powdery mildew at the initial stage of the disease, and then gradually expanded into irregular, inconspicuous powdery mildew spots (that is, conidiophores and conidia). When it is serious, dozens of powdery mildew spots gather together, but rarely cover the whole leaf, resulting in leaf yellowing and sometimes small black spots on the spot. Generally, the damaged leaves only showed chlorosis or yellowing. Towel gourd stem vines and fruits rarely occur.

2. control methods of towel gourd powdery mildew

When it comes to prevention and control methods, the pro-agricultural network here still recommends prevention, supplemented by treatment, because now everyone likes to eat pollution-free vegetables, towel gourd spraying too many drugs is not conducive to the sale of towel gourd, the following pro-agricultural network will specifically introduce how to prevent and cure.

1. Seed disinfection: dry seeds in the sun for 1-2 days before sowing to kill epidermis bacteria and improve germination potential. Soak the seeds in 50-55 ℃ warm water for 30 minutes, reduce the temperature to 30 ℃ and continue to soak the seeds for 8-10 hours, then disinfect them with 1% potassium permanganate solution for 20-30 minutes, rinse and accelerate germination under 28-30 ℃ for 48-72 hours, and sow seeds when exposed.

two。 Strengthen management: it is best to rotate 2-3 years with Gramineae crops, applying 5000-7000 kg of rotten farm manure, 20 kg of ternary compound fertilizer, 15 kg of potassium chloride and 5 kg of urea per mu. During the extension period, there is generally no topdressing, and during the fruit expansion period, 20 kg of potassium sulfate compound fertilizer is applied per mu, and the soil is kept moist, and ditches are cleared and drained in time after rain. Remove the basal disease and old yellow leaves in time, and bury them deeply or burn them centrally. Strengthen the ventilation and light transmission in the field and enhance the stress resistance of the plant.

3. Spray protective film: before or at the initial stage of the onset of towel gourd powdery mildew, 99.1% dipterex 300-500 times liquid was sprayed on the leaves to form a protective film, spraying once every 5-7 days, 2-3 times in a row.

4. Chemical control: timely drug control from late April to July. Before the occurrence of the disease, 53.8% can be used to kill type 2000 1000-fold liquid. At the initial stage of the disease, 10% difenoconazole 1500 times or 40% flusilazole 8000 times can be selected, or baking soda can be used for prevention and treatment. Spray is started when individual leaves have 1-2 disease spots, once every 3-4 days, and 4-6 times continuously. Baking soda can not only prevent diseases, but also promote growth, and increase the yield of towel gourd by 10-20%. Use small aperture spray plate as far as possible when spraying to reduce the surface humidity of the blade.

The above are the prevention and control methods of towel gourd powdery mildew brought by the pro-agricultural network, hoping to improve some help for the majority of farmers, properly sparse planting in the planting process, strengthen ventilation and light, and reduce the incidence of this disease.