Control methods of Tomato powdery mildew

Tomato is the tomato that we often see in our daily life, which is welcomed by many people and has a very wide planting area in our country. When growing tomatoes, we often encounter many diseases and insect pests that harm the growth of tomatoes, the most common of which is powdery mildew. So what are the symptoms of tomato powdery mildew? How to prevent and cure it? The following editor will give you a brief introduction, let's have a look!

1. Symptoms

Tomato powdery mildew is mainly harmful to tomato leaves, in the early stage of the disease, tomato leaves will appear a lot of mildew spots, mildew spots color is white. Then it will gradually expand into white patches, and the spots will merge with each other to form disease spots. When the disease is serious, the whole leaf will be powdery, resulting in the leaf withering and falling. In addition to leaves, tomato petioles, stems and fruits will also be infected, there will also be a white mildew layer, powdery matter is the conidia of powdery mildew.

2. Occurrence regularity

The occurrence of powdery mildew varies according to the planting area and the right hand. For example, in the north, the pathogen of powdery mildew overwintered on winter tomatoes, as well as on soil, diseased bodies and other substances. Then the ascospores will be released, and the infection will be transmitted with the air, Rain Water and so on, and then the diseased plants will emit new conidia and circulate according to this. If planted in the south, the conidia will reproduce very quickly, spreading all the time and expanding the affected area. The suitable temperature of conidia damage is about 22 degrees. Open-field cultivation generally occurs in June-October, less in August, and concentrated in April-May in greenhouse.

3. Prevention and control methods

First of all, we need to select an excellent variety to ensure strong disease resistance, and then disinfect the seeds before planting to reduce the number of pathogens. After planting, we should pay attention to control the temperature and humidity to avoid high temperature and humidity environment. After harvest, we should pay attention to timely removal of disease and disability, do a good job in clearing the garden, destroy the overwintering place of bacteria, and reduce the incidence of the following year. Then strengthen the prevention, the use of powder rust Ning, Fuxing EC and other agents for spraying prevention.

In the early stage of the onset of powdery mildew, if it is planted in a greenhouse, then dust or smoke should be used to disinfect the whole garden. Then we should pay attention to timely removal of diseased leaves, the use of triadimefon, Wuyisu water agent and other agents for spray control. About once a week, spraying for a month to inhibit the reproduction and spread of powdery mildew conidia and reduce the affected area.

The above is a brief introduction to the control methods of tomato powdery mildew. Tomato powdery mildew is only a common one of all tomato diseases and insect pests, and there are many diseases and insect pests that need our attention, so I hope you will pay more attention to them. That's all for today's introduction. This article is for reference only. Thank you for your reading and support.