Tomato stem blight mainly harms stems and fruits, but it can also damage leaves and petioles. The wounds on the stems are susceptible to disease. The lesions are initially oval or spindle-shaped, brownish, and pitted with ulcers. The posterior stems extend up and down to the entire plant, and the severe disease becomes dark brown and dry. The fruit was infected and the disease began as a grayish white patch, followed by a darkening of the lesion and the color became deeper and darker, resulting in black mold on the diseased part, causing fruit rot.
ã€Pathogen and Occurrence Rule】
Alternaria alternata is called Alternaria spp. The pathogens overwinter in the soil with the diseased body, spread by wind and rain, and penetrated by the wound. When high humidity, rain or more exposed, easy to disease.
[control methods]
After the harvest, we should clean the pastoral areas, remove the diseased bodies, and destroy them.
When the lesions are found in the field, timely application of pesticides can be controlled at the early stage of disease. The following fungicides can be used to control: 50% iprodione suspension 1000 times; 10% difenoconazole water dispersible granules 1500 times night + 75% chlorothalonil Clear WP 600 times; 250g/L urea suspension 2000 times; 52.5% carbendazim WP 800 times + 70% Mancozeb WP 600-1000 times; uniform spray, According to the condition, it was sprayed once every 7 days. In order to prevent drug resistance and improve control efficiency, alternate rotation or compound use is advocated. The lesions on the stem can be scraped off first, and then diluted with 10% of 2% pyrimidine nucleoside antibiotic solution, or 80% ethylicin EC or 70% thiophanate-methyl WP 500 times Brushing, have a better therapeutic effect.
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