How can cut-flower carnations be effectively protected against gray mold?
Symptoms: Elliptical, brown, large and wet spots first appear on the petals, then gray mold grows on them, and the petals and the whole flower rot as a result; the stems and flower buds can also be infected. Cause: Long-term exposure to low temperature and a humid environment. Control methods: Keep the plants as dry as possible, preferably using drip irrigation for fertilizer and water control; maintain good ventilation; spray 75% chlorothalonil at 500 times dilution, or carbendazim at 500 times dilution, alternating them, spraying once every 7 to 10 days; in the evening, a 10% procymidone
Symptoms: Elliptical, brown, large and wet spots first appear on the petals, then gray mold grows on them, and the petals and the whole flower rot as a result; the stems and flower buds can also be infected. Cause: Long-term exposure to low temperature and a humid environment.
Control methods: Keep the plants as dry as possible, preferably using drip irrigation for fertilizer and water control; maintain good ventilation; spray 75% chlorothalonil at 500 times dilution, or carbendazim at 500 times dilution, alternating them, spraying once every 7 to 10 days; in the evening, a 10% procymidone smoke agent can be released inside the greenhouse, and the greenhouse should be sealed for the night.