Powdery mildew is a common disease in the process of tomato cultivation. When the disease occurs, it will directly affect the yield and quality of the tomato, causing economic losses. This has caused many farmers to have headaches, so how can we reduce the damage caused by the disease? The following small series will tell you in detail about the prevention and treatment of this disease.

First, the symptoms of tomato powdery mildew

Diseases occur on leaves, petioles, stems and fruits.

The surface is covered with white powder, which is the mycelium, conidiophore and meridian of the pathogen. At first, the powder layer is sparse and gradually thickens later.

There are yellow-green spots on the front edge, which will cause the whole plant to die in the later stages 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. The pathogen is in the north, mainly wintering on winter Solanaceae vegetables. There is no obvious wintering phenomenon in southern tomato pathogens.

Communication characteristics. The pathogen spreads with the airflow, infects the new leaves, and re-infects through the 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.

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

Everyone knows that vegetables, fruits and plants often encounter pests and diseases. If you want to get high yields during the planting process, you need to do a good job of pest prevention. The above are the symptoms and prevention methods of tomato powdery mildew shared by Xiaobian. Planters can learn from it.

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