Control measures of stem blight of dragon fruit

In the process of dragon fruit planting, farmers often encounter various diseases such as stem blight, which seriously affect the yield and planting efficiency, and restrict the development of dragon fruit industry. So how to control the stem blight of dragon fruit? Come and have a look with the editor.

First, symptoms

The disease is the formation of gray-white irregular disease spots on the edge of the plant, there are a lot of small black spots, disease spots sunken, and gradually dry up, and finally form gaps and holes, mostly in the middle and lower stem nodes.

Second, the law of the disease.

The pathogen of stem blight overwintered with the diseased stem on the surface, and began to be excessive when the spring temperature was higher than 3 degrees. When the temperature was 15 degrees, it would spread to Atractylodes macrocephala Koidz to infect the fleshy stems of plants, and the optimum temperature for the disease was 20-30 degrees. Conidia will be re-infected with Rain Water sputtering and air transmission, mainly harming the fleshy stem of dragon fruit, which usually begins in late March, when the disease is just beginning to damage, the rate of diseased plant is still low, and the development of the disease is slow. After April, with the increase of temperature, the disease became more serious, and the disease reached its peak period from May to July, which was just before flowering. Because of the high temperature and the advent of rainy season, the disease spread rapidly in the field. In addition, the incidence in low-lying and heavy soil areas is higher than that in high-lying sandy loam areas, and the partial application of nitrogen fertilizer will also aggravate the occurrence of the disease.

III. Comprehensive prevention and control measures

1. Agricultural prevention and control

It is necessary to select disease-free seedlings, if the selection must be transferred and introduced to diseased areas, and the varieties with strong disease resistance must be selected, which is the most economical and effective measure to control pitaya disease. Remove the diseased and residual branches and weeds in the field in time after harvest, keep the field clean, reduce the number of pathogens, strengthen fertilizer and water management during the growing period, watering should not be flooded to avoid root suffocation and death, it is best to use drip irrigation and ridging cultivation, fertilizing more organic fertilizer and phosphorus and potassium fertilizer to improve disease resistance.

2. Chemical control

It can be propagated with Bordeaux solution, prochloraz, prochloraz manganese salt, methyl topiramate, mancozeb, carbendazim, etc., and sprayed every 7-10 days for 2-3 times.

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