Pepper blight
2020-04-22 12:12:29
Pepper disease (Pepper Phytophthora blight 0) is an important disease of pepper, often causing a large number of dead cockroach, rotten fruit. In addition to damage sweet pepper, but also damage tomatoes, eggplant, wax gourd, zucchini and so on.
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Symptoms? Both seedling stage and adult stage can be infected?
Infected at the seedling stage, water-stained decayed, dark greens appeared near the base of the stem, and died after being stumped or littered. In the adult stage, dark green leaves and inconspicuous circular spots appear on the leaves. The leaves are topped with rot and the spots turn green and yellow.
Shoots and stems become infected, resulting in near-black streaks, mostly from the base of the disease, the disease often soft rot, the disease above the branches and leaves soon withered. In high humidity, the diseased part produces white mold.
Fruit infections often start from the pedicle and form dark green water stains. The edge is not obvious. The fruit turns brown and soft rot. White mold is produced on the lesion when wet.
?? Pathogen? Phytophthora copsici Leonian flagellum is a subdivision of Phytophthora. Mycelium filamentous, without separation. Sporocysts are colorless and filiform. Sporangia terminal, unit cell, ovoid. Thick clam spores spherical, yellow. Oval spores are spherical. The optimum temperature is 20 to 30°C.
?? The characteristics of the disease? The oocysts spores, chlamydospores with the disease in the soil in winter, as the main source of infection in the following year. After rainwater splashing and irrigation water spread to the base or fruit of the stem, when the conditions are appropriate, germination and infection cause hair growth, repeated infection, and sporangia produced by the diseased part. High temperature and high humidity are favorable to the occurrence and prevalence of this disease. The bacteria can grow and develop in the range of 10 to 37°C. After the heavy rain, the weather was hot and the disease became popular. Rainfall, rainfall, land area, and many years of heavy rainfall are all conducive to hair growth?
?? Prevention methods
? 1, rotation. A two- to three-year rotation is preferred, preferably with a cruciferous rotation.
?? 2, pay attention to drainage. Cultivation of sorghum, drainage in time after rain. Protect the land from flooding and increase ventilation to reduce temperature and humidity.
? 3, chemical control. Most of these diseases belong to soil-borne diseases. In addition, rainwater and irrigation water can also be transmitted. This is a more epidemic airborne disease. Chemical control should be performed at the early stage of disease. The type, method, and control of downy mildew are similar when the disease is prevalent on the ground. In the initial stage of disease, 72.2% Prokary Water is used to irrigate the roots at 600-800 times, and each plant is cast in 100-200 ml. Or choose 72% Kelu WP 800~1000 times, 58% Jinlei Duomi Mn Zn 800 times wettable, 69% Anke WP 3000 times, 80% Dasheng, 80% Shan Desheng, 80% New Wansheng WP 800 times, in order to save the labor can also be directly sprayed in the roots of the above-mentioned agents, the prevention of damping-off occurs at the seedling stage can also be used to treat bed soil with 3000 times xylostride 3000 times, also available 1:1 The amount of 8 grams per square meter of carbendazim and thiram mixed with some soil, sowing seeds in the lower 1/3, cover 1/3 to protect the seedlings. Among them, 72.2% Prokary water as a prophylactic agent applied to plants can show very good results. Because the bacteria are resistant to the systemic fungicide, the protective agent and the systemic adsorbent are mostly used to prolong the life of the fungicide.
Symptoms? Both seedling stage and adult stage can be infected?
Infected at the seedling stage, water-stained decayed, dark greens appeared near the base of the stem, and died after being stumped or littered. In the adult stage, dark green leaves and inconspicuous circular spots appear on the leaves. The leaves are topped with rot and the spots turn green and yellow.
Shoots and stems become infected, resulting in near-black streaks, mostly from the base of the disease, the disease often soft rot, the disease above the branches and leaves soon withered. In high humidity, the diseased part produces white mold.
Fruit infections often start from the pedicle and form dark green water stains. The edge is not obvious. The fruit turns brown and soft rot. White mold is produced on the lesion when wet.
?? Pathogen? Phytophthora copsici Leonian flagellum is a subdivision of Phytophthora. Mycelium filamentous, without separation. Sporocysts are colorless and filiform. Sporangia terminal, unit cell, ovoid. Thick clam spores spherical, yellow. Oval spores are spherical. The optimum temperature is 20 to 30°C.
?? The characteristics of the disease? The oocysts spores, chlamydospores with the disease in the soil in winter, as the main source of infection in the following year. After rainwater splashing and irrigation water spread to the base or fruit of the stem, when the conditions are appropriate, germination and infection cause hair growth, repeated infection, and sporangia produced by the diseased part. High temperature and high humidity are favorable to the occurrence and prevalence of this disease. The bacteria can grow and develop in the range of 10 to 37°C. After the heavy rain, the weather was hot and the disease became popular. Rainfall, rainfall, land area, and many years of heavy rainfall are all conducive to hair growth?
?? Prevention methods
? 1, rotation. A two- to three-year rotation is preferred, preferably with a cruciferous rotation.
?? 2, pay attention to drainage. Cultivation of sorghum, drainage in time after rain. Protect the land from flooding and increase ventilation to reduce temperature and humidity.
? 3, chemical control. Most of these diseases belong to soil-borne diseases. In addition, rainwater and irrigation water can also be transmitted. This is a more epidemic airborne disease. Chemical control should be performed at the early stage of disease. The type, method, and control of downy mildew are similar when the disease is prevalent on the ground. In the initial stage of disease, 72.2% Prokary Water is used to irrigate the roots at 600-800 times, and each plant is cast in 100-200 ml. Or choose 72% Kelu WP 800~1000 times, 58% Jinlei Duomi Mn Zn 800 times wettable, 69% Anke WP 3000 times, 80% Dasheng, 80% Shan Desheng, 80% New Wansheng WP 800 times, in order to save the labor can also be directly sprayed in the roots of the above-mentioned agents, the prevention of damping-off occurs at the seedling stage can also be used to treat bed soil with 3000 times xylostride 3000 times, also available 1:1 The amount of 8 grams per square meter of carbendazim and thiram mixed with some soil, sowing seeds in the lower 1/3, cover 1/3 to protect the seedlings. Among them, 72.2% Prokary water as a prophylactic agent applied to plants can show very good results. Because the bacteria are resistant to the systemic fungicide, the protective agent and the systemic adsorbent are mostly used to prolong the life of the fungicide.
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