Cowpea root rot symptoms and prevention methods
Cowpea root rot is a disease that occurs during the growth of cowpea, which seriously affects the growth of cowpea and causes great losses to farmers. So, what is the cause of cowpea root rot? How to prevent and cure cowpea root rot? This article will give you a detailed introduction for this, the details are as follows:
First, the symptoms
Cowpea root rot generally begins to develop after the emergence of compound leaves, and the plant performance is obviously short. After flowering and pod-forming, the symptoms gradually become obvious. The leaves in the lower part of the plant are yellow and the leaves are withered, but they do not fall off and the plants are easily removed. The upper part of the main root and the lower part of the stem become brown or black, and the diseased part is slightly sunken and sometimes cracked. Longitudinal section of the disease, the vascular bundle is reddish brown. After the main roots were all infected, the stems and leaves on the ground died. When wet, the diseased part produces pink mold, which is the conidia of the pathogen.
Second, the pathogen
Cowpea root rot is a common plant disease caused by microorganisms such as the genus Aspergillus spp., Fusarium oxysporum.
Third, the infection cycle
Root rot is caused by the infection of the fungus Aspergillus spp., Fusarium oxysporum. The bacteria survive the winter on the sick body or in the soil and can survive for about 10 years. The germs are mainly spread by the soil and infested by irrigation, fertilization and wind and rain. The optimum growth temperature of the pathogen is 29-30 ° C, the highest is 35 ° C, and the lowest is 13 ° C. The soil has high humidity and much irrigation, which is conducive to the development of the disease; continuous cropping, low terrain, poor drainage, and serious onset.
Fourth, the cause
First, the same variety of vegetables continuous cropping, resulting in the accumulation of bacteria, increasing the probability of infection;
Second, the mechanical damage is serious, especially during the process of transplanting seedlings, part of the roots are broken, the wound is large, and it is difficult to heal;
The third is the low temperature freezing damage during the seedling stage. Shortly after the seedlings are unearthed, the soil temperature suddenly drops, causing the symptoms of red roots in the seedlings. These conditions may cause root rot fungi infection.
Fifth, prevention and treatment methods
First, we must pay attention to the time of planting and planting, sowing seedlings when the ground temperature is stable above 12 °C.
The second is to use the medicinal agent to irrigate the roots in time. It is better to perform the treatment before the three-leaf and the early flowering stage. The root can be treated by using Jinlei 500 times liquid and 1000 times liquid of the fresh amine to prevent root disease.
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