How to control pepper wilt
Pepper bacterial wilt is a typical bacterial soil-borne disease. Its pathogen is Pseudomonas palustris. Bacteria survive for a long time, mainly through the wounds of the plant stems. When transplants, agricultural operations such as loose soil, and root wounds caused by insects and other injuries can cause bacteria in the soil to invade and reproduce rapidly under high temperature and high humidity conditions.
First, the symptoms of bacterial wilt, also known as bacterial wilt, usually show symptoms in the adult flowering stage. In the early stage of disease, the top leaves began to droop, or a few leaves on individual branches wilted, and then spread to wilting in whole plants. During the early days, they wilted during the day and returned to normal sooner or later. They did not recover and died in later stages, and the leaves did not fall off easily. Generally from the performance of the symptoms to the whole plant withered about 7 days. The root of the plant stem was the first disease, but no obvious lesions on the outside, rough surface. In wet conditions, water-soaked streaks often appear on diseased stems and then turn brown or dark brown. The diseased stem is cut longitudinally and the vascular bundle becomes brown. Cross-cut stems, cut pale brown, squeezed or wet stems can be seen after the overflow of milky white mucus. The stems of the diseased plants were hollow in the later stages, and the cortex of the diseased stem base was not easily peeled off, and the roots were not rotted.
Second, the incidence of pathogenic bacteria mainly with the sick in the soil in winter. The winter overwintering pathogenic bacteria of the following spring is spread by rainwater and irrigation water, invaded from the wound, and bred and propagated for a long period of time until the adult plant meets the conditions of high temperature and high humidity. It expands upwards and propagates in the vascular conduit so as to block the catheter or cell. Poisoning, resulting in wilting leaves. Pathogens can also enter the adjacent parenchyma cells through the catheter, causing blister-like irregular lesions on the stem. When the soil temperature reached 20°C, the onset center appeared, and the onset peak occurred at 25°C. After a long period of rain or heavy rain, the temperature rose sharply and the condition worsened.
Third, control methods
1. Agricultural measures: Use cruciferous crops or grass crops for more than four years, use disease-free seeds, remove diseased plants in time, and sprinkle a little lime on the diseased holes for disinfection and sterilization.
2. Chemical control:
100-200 mg/kg streptomycin sulfate, or 30% BT WP 500 times, or 77% WP 500 times, or 14% Ammonia Bronze 300 times Spray once every 7-10 days, continuous control 3 times, the effect is better.
Can also be in the colonization of rooting water when the solution is poured, this time the required amount of liquid is less, each strain of leaching 250ml, every 5-7 days, once every 3 consecutive times, can effectively protect the roots, to the early flowering period Strengthen 2 times, can effectively control the occurrence of the disease; the early onset of the key application of pesticides, using the root irrigation method, each planting 500ml, while the timely removal of the diseased plants, irrigation is prohibited when flood irrigation, to prevent the spread of bacteria.
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