Excessive spray concentration of triadimefon may cause injury to broad beans

Zhu Lihong, Chentao Township, Binhai County, came to the telephone to report that some of the local faba beans had phytotoxicity after using polyketone, and the top of the plants drooped on the day of application, after which the plants died slowly. Among them, a piece of more than 3 acres of broad bean field, 10 days before the application of pesticides, per acre with 40% polyketone wettable powder (containing carbendazim 35%, triadimefon 5%) 70 grams, spring spring leaf fertilizer 50 Grams, add water 20 kilograms of spray, spray the day the emergence of symptoms of injury. It is understood that there is no symptom of phytotoxicity in the broad bean field where carbendazim single agent, thiram and triadimefon are used. He asked if faba bean was harmed by polyketones.

The reporter learned from a number of companies that produce polyketone that carbendazim, triadimefon and its compound polyketone can all be used to prevent and control broad bean diseases. Broad bean is more sensitive to triadimefon, and the use of excessive concentration is prone to phytotoxicity. Symptoms of injury are slow plant growth, small leaves, dark green leaves, or stagnant growth. After the occurrence of phytotoxicity, it is necessary to stop the use of drugs and to strengthen the management of fertilizer and water to promote the recovery of crops.

According to relevant data, 33% of the polyketone WP (containing carbendazim 25% and triadimefon 8%) is suitable for the control of wheat scab and powdery mildew, rape sclerotinia disease, and broad bean red spot. For the control of broad bean spot, can be diluted with water 800-1000 times spray, usually 50 grams per acre medication, add water 40-50 kg spray, equivalent to the amount of 4 grams of triadimefon pure herbs, triadimefon spraying concentration of 0.08 -0.1 g/l.

Zhu Lihong’s plots reflect the use of 40% polyketone wettable powder 70 g water and 20 kg spray per acre spray about 300 times diluted with water, triadimefon pure drug from the amount of 3.5 grams, lower than the normal amount; triadimefon The spray concentration was 0.175 g/l, higher than normal. However, the triadimefon phytotoxicity reaction is generally slow. From the situation that the top of the plant appeared wilting during the day of application, the phytotoxicity should not be directly caused by the two drugs of carbendazim and triadimefon. Caused by. The specific reason is that it needs further investigation.

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