Now that the weather is getting more and more, the temperature is rising, and the crops in the studio are different! On April 11th, a netizen posted a message on Huinong. Question: What kind of medicine is used for powdery mildew? This article will explain in detail the prevention and treatment of tomato powdery mildew.
First, the symptoms of tomato powdery mildew
Diseases occur on leaves, petioles, stems and fruits.
In the early stage of the disease, there are chlorotic spots on the leaves.
After expansion, it is an irregular shaped lesion with a white powder on the surface. It is a mycelium, a conidiophore and a conidia of the pathogen. At first, the powder layer is sparse and gradually thickens later.
The lesions are contiguous or cover the entire leaf surface, and the front side is a yellow-green plaque with inconspicuous edges. The diseased leaves become brownish and gradually die in the late stage of the disease. When the petiole, stem and fruit are infected, the disease site also produces white powdery lesions.
Second, the incidence of tomato powdery mildew
It is easy to develop under dry conditions.
Overwintering and initial infection sources. The pathogen is in the north, and the pathogen mainly winters on the winter Solanaceae vegetables. In the perennial planting area of ​​southern tomatoes, the pathogens have no obvious overwintering phenomenon, and conidia are continuously produced and smashed.
Communication characteristics. The pathogen spreads with the airflow, infects the new leaves, and then produces conidia in the diseased part. The mature conidia are shed and then invaded by airflow.
Third, the prevention and treatment of tomato powdery mildew
Agricultural control
Pay attention to the selection of resistant varieties. Strictly control the air humidity to prevent the formation of a dry environment and timely watering. Clean the countryside. Remove the diseased body in time after harvest, reduce the source of bacteria, concentrate deep burial or destroy.
Chemical control - reference for prevention and treatment
23% amino azoxystrobin suspension (low toxicity) using 65-98 g / ag spray
40% benzotrizime suspending agent (low toxicity) using 30-40 ml / mu spray
29% pyraazine azoxystrobin suspension (low toxicity) using 30-50 ml / mu spray
75% sputum · tebuconazole water dispersible granules (low toxicity) using 10-15 g / mu spray
5% oxazolol suspension (low toxicity) spray with 800-1000 times
25% acetaminophen suspension (low toxicity) using 65-95 ml / mu spray
30% epoxiconazole suspension (low toxicity) spray with 1600-2300 times
12.5% ​​powder of oxazolol (low toxicity) using a spray of 50-65 ml / acre
25% acetaminophen sulfonate microemulsion (low toxicity) using 60-80 ml / mu spray
10% flusilazole water emulsion (low toxicity) using 40-50 ml/mu spray
10% difenoconazole water dispersible granules (low toxicity) using 50-80 g/mu spray
10% pentozoazole EC (low toxicity) using 2000-3000 times spray
30% epothilone wettable powder (low toxicity) using 28-35 g/mu spray
40% myclobutanil wettable powder (low toxicity) using 7.5-10 g/mu spray
30% fluconazole wettable powder (low toxicity) using 8-12 g/mu spray
Regarding the prevention and control of tomato powdery mildew, I would like to talk about it here. I hope everyone can refer to it. The specific measures can be combined with the actual situation. If you have any questions, you can leave a message in the comment area or consult a local agricultural expert. I hope everyone can plant it. Produce high-yielding crops.
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