How to prevent and control gray mold in cut-flower carnations?
Symptoms: Initially, oval, brown, large and wet spots appear on the petals, followed by gray mold growing on them, and the petals and the entire flower then rot; the stems and flower buds can also be infected. Cause: Long-term exposure to a low-temperature and humid environment. Prevention and control methods: Keep the plants as dry as possible, preferably using drip irrigation for fertilizer and water control; maintain good ventilation; spray 75% chlorothalonil 500x solution, or carbendazim 500x solution, alternating them, spraying once every 7 to 10 days; in the evening, a 10% procymidone smoke agent can be released in the greenhouse, sealing the greenhouse overnight.
Symptoms: Initially, oval, brown, large and wet spots appear on the petals, followed by gray mold growing on them, and the petals and the entire flower then rot; the stems and flower buds can also be infected. Cause: Long-term exposure to a low-temperature and humid environment.
Prevention and control methods: Keep the plants as dry as possible, preferably using drip irrigation for fertilizer and water control; maintain good ventilation; spray 75% chlorothalonil 500x solution, or carbendazim 500x solution, alternating them, spraying once every 7 to 10 days; in the evening, a 10% procymidone smoke agent can be released in the greenhouse, sealing the greenhouse overnight.