Recently, when the author went into the greenhouse inspection process, it was found that tomato late blight occurred in greenhouses. Suffolk and some surrounding areas in Shouguang City had serious and stubborn illnesses. For this reason, the authors specifically described the symptoms and pathogenesis of the disease. The actual prevention and control measures are described as follows:
When the symptoms of leaf in the field are severely damaged, water-soaked, light green lesions appear on the surface of the leaves and gradually turn brown. When the air humidity is high, a white mold layer is formed on the lesions, and sparse white mold layer occurs on the lesions on the back of the leaves. When the stems and petioles were infected, the lesions showed water-soaked brown patches with depressions that eventually became dark brown and gradually rotted, causing wilting of the plants. When the fruit is infected with pathogenic bacteria, the lesions sometimes have irregular cloud patterns, initially dark greenish greasy, and then turn dark brown to tan, and the edges of diseased and healthy junctions are obvious. The texture of the fruit is hard, not soft, and the taste is bitter. In moist conditions, the diseased fruit rots and the black mold layer develops. The disease has a fast onset, resulting in reduced production or even loss of production when the disease is severe.
If the conditions are suitable, the diseased plants will spread to the surrounding area quickly after infection. The pathogens will invade directly from the stomata or epidermis of the plant.
The most suitable temperature is 18-22 degrees, and the suitable air humidity is more than 95%. Especially when the condensation occurs in the evening, the disease is heavy, and when the temperature is high and low humidity, especially when the temperature difference between hot and cold changes greatly, it is more conducive to the epidemic of the disease. When the soil nitrogen fertilizer is too much or when the planting density is too large, the light transmission in the field is not good, and the ventilation can not induce the disease.
Prevention
1. When a central diseased plant is found, it should be sprayed in time. It is recommended that the majority of vegetable farmers can spray Suzhining 500 times, and Lubara 600 times, adding sea chlorophyll control effect is better. For the severe sickroom, 300 times of 300 can be used Rububa can be added 1000 times the cloud Daquan trees can be sprayed, once in 5 days, can be cured twice in a row.
2, according to the physiological characteristics of tomatoes, formula fertilization, and close planting, note that the current remember not to flood irrigation, in order to avoid a large temperature difference between day and night, plant leaf surface condensation, do not create favorable conditions for the occurrence of diseases .
When the symptoms of leaf in the field are severely damaged, water-soaked, light green lesions appear on the surface of the leaves and gradually turn brown. When the air humidity is high, a white mold layer is formed on the lesions, and sparse white mold layer occurs on the lesions on the back of the leaves. When the stems and petioles were infected, the lesions showed water-soaked brown patches with depressions that eventually became dark brown and gradually rotted, causing wilting of the plants. When the fruit is infected with pathogenic bacteria, the lesions sometimes have irregular cloud patterns, initially dark greenish greasy, and then turn dark brown to tan, and the edges of diseased and healthy junctions are obvious. The texture of the fruit is hard, not soft, and the taste is bitter. In moist conditions, the diseased fruit rots and the black mold layer develops. The disease has a fast onset, resulting in reduced production or even loss of production when the disease is severe.
If the conditions are suitable, the diseased plants will spread to the surrounding area quickly after infection. The pathogens will invade directly from the stomata or epidermis of the plant.
The most suitable temperature is 18-22 degrees, and the suitable air humidity is more than 95%. Especially when the condensation occurs in the evening, the disease is heavy, and when the temperature is high and low humidity, especially when the temperature difference between hot and cold changes greatly, it is more conducive to the epidemic of the disease. When the soil nitrogen fertilizer is too much or when the planting density is too large, the light transmission in the field is not good, and the ventilation can not induce the disease.
Prevention
1. When a central diseased plant is found, it should be sprayed in time. It is recommended that the majority of vegetable farmers can spray Suzhining 500 times, and Lubara 600 times, adding sea chlorophyll control effect is better. For the severe sickroom, 300 times of 300 can be used Rububa can be added 1000 times the cloud Daquan trees can be sprayed, once in 5 days, can be cured twice in a row.
2, according to the physiological characteristics of tomatoes, formula fertilization, and close planting, note that the current remember not to flood irrigation, in order to avoid a large temperature difference between day and night, plant leaf surface condensation, do not create favorable conditions for the occurrence of diseases .
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