Recently, some growers have reported that there are slightly small black spots on the tomato fruit in the greenhouse (as shown in the figure), which seriously affects the normal coloration and product quality of the fruit. What kind of disease is this, which should be treated with sputum? According to the symptom analysis It should be caused by the harmfulness of tomato bacterial spot disease.
Symptoms: The disease is also called bacterial spot disease. In recent years, the incidence of tomato planting area is heavier and aggravated. The rate of diseased plants is generally about 60%, and the yield loss is as high as 50% to 75%. The disease mainly affects leaves, stems, flowers, petioles and fruits, especially leaf margins and immature fruits. When the leaves are infected, they first produce dark brown to black spots on the leaves, and often have yellow halos around them; the stems and petiole are infected, and the disease parts produce black spots; the young green fruit is infected, and the small spots that start to rise slightly begin to grow. When mature, the tissue around the spot remains green for a longer period of time.
Cause of the disease: The bacteria overwinter in seeds, diseased plants and soil. It is spread by rainwater splashing, pruning, harvesting and other farming operations. It is conducive to the serious occurrence of the disease under humid, low-temperature and rainy conditions.
Prevention and treatment method: 50% chlorobromoisocyanuric WP 750 times solution + 20% rosin acid emulsifiable concentrate 2000 times solution, 30% succinic acid copper WP WP 600 times solution + 10% phenyl ether ring The azole water dispersible granule 1500 times liquid, 47% Chunlei·Wang copper wettable powder 450 times liquid, 14% lycopene copper water 300 times liquid, 77% copper hydroxide wettable powder 500 times liquid and the like spray control. For the above drugs, pay attention to the use of rotation.
More pesticide knowledge , please pay attention to China Pesticide Network
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