Recently, some growers have reported that there are a large number of dark brown patches on the tomato stalks in greenhouses. There are round or irregular black-brown spots on the leaves, yellow spots around the spots, and what is the disease? In addition to governance. According to the analysis of the symptoms provided, it should be due to bacterial bacterial spot disease.
The disease is also called bacterial spot disease. In recent years, the incidence of heavier disease in the tomato planting area in Wei County has increased. The diseased plant rate is generally about 60%, and the yield loss is as high as 50%-75%. The disease mainly damages leaves, stems, flowers, petioles and fruits, especially the margins of leaves and immature fruits. When the leaves become infected, they first produce dark brown to black spots on the leaves, often with yellow halos around them; stems and petioles become infected, and diseased parts all produce black spots; young greens become infected and begin to show small bulging spots. When mature, the tissue surrounding the spot remains green for a longer period of time.
The disease winters in seeds, diseased plant residues and soil. It spreads through agricultural operations such as rain splashing or pruning, harvesting, etc. It is conducive to the occurrence of serious diseases under conditions of humid, low temperatures, rain, and sprinkler irrigation.
In addition to governance methods:
(1) Spray with 50% bromochloroisocyanuric acid wettable powder 750 times + 20% copper rosinate cream 2000 times.
(2) Spray with 30% citric acid copper wettable powder 600 times liquid +10% difenoconazole water dispersible granules 1500 times.
(3) Spray 1-2 times with 47% spring thunder-copper WP wettable powder 450 times, each time interval 5-7 days.
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