Grey mold disease

Symptoms: from February to April in Taiwan, the outdoor humidity is low and the internal humidity is high, or flowers are susceptible to the disease when it rains, especially Cartland and Phalaenopsis. At first, there are small brown spots on the petals, which will wither the petals.

Prevention and control methods:

After January and May, the temperature gradually increased, and the disease naturally decreased.

2. When diseased petals are found, ventilation should be strengthened during the day to reduce indoor humidity.

3. Usually use 1500 times of 25% fenrustine emulsion, 50% manganic wettable powder, 50% carbendazim powder, 1500 times methyl topiramate or 1000 times carbendazim, and spray regularly.

4. 1000 times of 50% clonitramine, 50% manganese wettable powder or 80% zinc wettable powder can be sprayed once a week. (Xue Congxian)