First, the damage of the vetch
The prickly pear disease, also known as the dry rot of the pepper, is a fungus-like disease of ascomycetes. The disease mostly occurs in prickly-ash trees cultivated in stagnant and cloudy plots. It mainly damages the trunk of prickly ash, especially the base of the trunk. The symptoms were not obvious at the time of initial onset, but reddish-brown lesions appeared at the site of the disease. As the lesions expanded, the diseased part appeared wet and rot, the epidermis was slightly sunken, and fluidity appeared. After that, the lesion gradually turned black and the surface of the diseased part shrank and cracked. Due to rot and cracking of the diseased part, the transport of nutrients in the tree was poor, resulting in yellowing of the diseased leaves on one side of the diseased part, withering, and even death of the upper branches of the diseased stems and even the death of the whole plant.
Second, transmission routes and disease conditions
The pathogenic bacteria overwinter in the diseased part with mycelia and propagules. In early May, when the warming temperature began to pick up, the old lesions began to expand. In June-July, diseased spores in the diseased part spread through wind and rain and irrigation water. Under natural conditions, most of the prickly ash trees that are harmed by G. edulis have gum disease. Under normal circumstances, the pepper garden is warm, wet and susceptible to disease, and old trees suffer from severe disease. The disease-resistant varieties of bean pepper and the wild type of dog pepper have little or no incidence.
Third, prevention and control methods
1. The pepper garden should be promptly drained in case of rain; the old pepper garden should be used to press soil for soil change, that is, to clear the old soil under the tree in the autumn, and cultivate 40 cm of new soil in the root.
2. Strengthen cultivation and management to avoid mechanical damage to the tree during agricultural operations.
3. Chemical control. During the occurrence period of the chitin tree, 50% omethoate EC was applied 5 times with equal amount of diesel oil to spray trunk insects. A week after spraying 70% thiophanate-methyl 800 times, pest control effect is good.
4. Scratch the lesions. The lesions with lighter lesions on the big stems were scraped and the rot or lime sulfur was applied on the wounds.
5. Grafting prevention. The use of pepper trees with well-developed roots and strong disease resistance as rootstocks and grafting of Dahongpao with good economic characteristics can not only increase the yield of pepper, but also reduce the occurrence of gum disease. Grafting methods can be used for bud grafting, branching and docking, but also resistant to pepper tree
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