The latest control methods of asparagus stem blight

Asparagus is a stem vegetable that people often eat, and in the process of planting, stem blight will lead to a serious reduction in production, stem blight is also known as asparagus cancer, light yield reduction, heavy harvest, bringing great losses to the majority of growers. So how to control asparagus stem blight? Come and have a look with the editor.

Symptoms of the disease

The pathogen of asparagus stem blight was harmful to tender stems and shoots. After being infected by the pathogen, the disease spot of milky white needle spot in the field was initially infected, and the spot gradually expanded into spindle-shaped or fusiform spot. And the spot will gradually turn brown, the center is grayish brown, sunken, scattered small black spots, that is, conidium. When the disease spot is serious, it will cover the whole plant, and when the disease spot surrounds the stem for a week, the whole plant will dry up and die.

Second, occurrence regularity

In the cold winter, the aboveground part of asparagus withered and died, and the pathogen overwintered on the diseased remains with hyphae and conidia. Under the condition of suitable temperature and humidity in spring, conidia were produced from conidia and infected for the first time. In greenhouse cultivation, asparagus is growing all the year round, which also provides favorable conditions for asparagus stem blight. There is no overwintering dormancy and primary infection, and multiple infection cycles can be carried out throughout the year.

III. Prevention and control methods

1. Select disease-resistant varieties

First of all, the prevention and control of stem blight should start from the source. Before raising seedlings, the seeds should be disinfected, the pathogen of stem blight should be controlled, and preventive measures should be taken in seedling management. Regular observation, every half a month to spray carbendazim and mancozeb as a preventive chemical control, but also to control aphids, thrips, night moths and other larvae.

2. Do a good job in clearing the garden

The key link of asparagus disease prevention in winter is whether the garden is timely and thorough, which determines the incidence of stem blight in the coming year. The best way to control stem blight is to reduce the number of pathogens, and the way to reduce the number of pathogens is to clear the garden.

3. Shelter cultivation in greenhouse

The most effective method to control asparagus stem blight in greenhouse cultivation is to use greenhouse planting, first, it can prevent Rain Water from entering the greenhouse and block the way of transmission during the period of transmission; second, it can regulate temperature, prevent plant premature senescence and improve immunity; third, fumigation fungicides can be used to greatly reduce manpower, material and financial resources; fourth, significantly prolong the picking period and increase yield.

4. Chemical control

The main control agents for stem blight are carbendazim, mancozeb, chlorothalonil, Bordeaux solution and so on. In order to avoid the emergence of drug resistance, different agents should be used alternately.

The above is the introduction of the prevention and control methods of asparagus stem blight, hope to help you, want to know more related knowledge, please pay attention to us.