Loofah is prone to a variety of diseases during the whole growth process, such as viral diseases, downy mildew, powdery mildew, etc. There are many pesticide fungicides used in the prevention and treatment process. Let us look at the different symptoms and prevention of different diseases. method:
Loofah virus disease
Loofah virus disease can be transmitted through aphids, farming operations and sweat contact.
symptom
The susceptible leaves are chlorotic small ring spots with light green and dark green. The old leaves are yellow ring-shaped spots or yellow-green-yellow leaves. The leaves are twisted and twisted, and the fruit is twisted after the onset. Brownish green lesions on the leaves. When the disease is severe, the leaves become hard and brittle, the leaf margins are deepened, and dead spots are produced later.
Law of occurrence
It mainly harms the young leaves of loofah and is caused by a variety of viruses. Cucumber mosaic virus and tobacco ring spot virus invade more hosts, and the virus can overwinter on many weeds. Spring aphids spread the virus to loofah. When the mites were severe, the loofah virus disease was severe.
Control method
Before planting, apply the base fertilizer, increase the application of phosphorus and potassium fertilizers, remove the weeds in the field and surrounding areas in time, remove the diseased plants when topping and playing the right, wash the hands with soapy water and contact the healthy plants after contacting the diseased plants. (1) Select resistant varieties. (2) cultivating disease-free and strong seedlings, appropriate early colonization; (3) timely control of aphids; (4) spraying 20% ​​of virus A temperable powder 500 times solution and 2% amino oligosaccharide 1500 times solution at the beginning of the disease; It can be sprayed with 15% phytopathogenic 1000 times solution and agricultural streptomycin 300-400 times solution.
2. Loofah downy mildew
It is transmitted from neighboring diseased leaves by wind and rain, and it is severe when it is rainy or humid.
symptom
The main damage to the leaves, first appeared irregular chlorotic spots on the front of the leaves, and then expanded into polygonal yellow-brown lesions. When the humidity is high, the purple black mold layer grows on the back of the lesion, and the leaves are contiguous in the later stage, so that the leaves die.
Law of occurrence
The loofah downy mildew is a fungal disease. The bacteria overwinter on the diseased leaves, and the initial infection and reinfection with the wind spread. The rainy season in the melon period or the high humidity in the field is serious.
Control method
Use disease-resistant varieties to strengthen field management. (1) Agricultural control, selecting high-quality, well-drained fields; (2) spraying 72% DuPont Kelu 400-600 times liquid, 56% azoxystrobin 1200-1500 times liquid in the early stage of the disease; It can be sprayed once every 10 days with 50% frostbite copper 600 times solution or 70% mancozeb 800 times solution and 70% methyl thiophanate 800-900 times solution, and sprayed 3-4 times.
3. Loofah powdery mildew
Loofah powdery mildew spreads by airflow or rainwater and is reinfected many times. It is more conducive to the spread of pathogens under low humidity and even drought conditions.
symptom
Mainly harmful to loofah leaves, petiole is also affected. At the beginning of the disease, white powdery spots were formed on the leaves. In severe cases, the whole leaf surface was covered with a layer of white powder, and the leaves turned yellow and dry in the later stage.
Law of occurrence
The pathogens overwinter on the diseased body, and the first infestation begins when the spring conditions are appropriate in the second year. During the growing season, a large number of powder spores are produced on the lesions, which can be re-infected by the wind and rain. The 7-8 months are the peak period.
Control method
After the autumn harvest, the diseased bodies in the field were completely removed and burned intensively. In the second half of June, the 1:1:200 Bordeaux solution was sprayed once, and in the first part of July, it was sprayed once every 5-8 days with 25% tebuconazole 1500 times. Continuous control 2-3 times.
In the growth process of loofah, it is necessary to carefully observe which kind of disease is occurring, and the right medicine can be mixed, and several fungicides can be mixed to prevent the occurrence of various diseases.
More pesticide knowledge , please pay attention to China Pesticide Network
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