The main diseases of velvet arrowroot

Velvet arrowroot leaf blight

Leaf blight can cause large areas of leaves to dry out. In the early stage of the disease, small red wrinkled spots appear on the leaves, which then quickly expand into a circle. The spots appear light brown and water-soaked. In the later stage, the edges of the spots turn reddish brown. If not treated, half of the leaf or even the entire leaf will die quickly.

Prevention and control methods: When the disease occurs, repot in time, cut off the diseased leaves and rotten roots, soak in methyl thiophanate solution for 15 minutes, dry and change to sterile planting material, then use 75% wettable powder of chlorothalonil (also known as Daknin), diluted with 600-800 times of clean water, spray once every 7-10 days, and spray three times in a row to effectively control leaf blight.

Velvet Arrowroot Anthracnose

The air humidity requirement is between 75-90% . Low air humidity will cause leaves to curl, wither, and have burnt edges, which is anthracnose .

Prevention and control methods: Spray 800-1000 times diluted systemic wettable powders such as carbendazim and thiophanate-methyl on the leaves for prevention and control. This type of fungicide can also be diluted 500-600 times and used to water the potting soil. In the future, pay attention to spraying water on the leaves or in the growing environment more often to increase air humidity and reduce the occurrence of anthracnose. It is best to choose purified water or rainwater for watering. Tap water must be dried for about 2-3 days before watering. The principle of fertilizing is to apply light fertilizer frequently, with nitrogen fertilizer as the main ingredient. It is best to choose fully water-soluble fertilizers, such as 'Hua Duo Duo' and other special fertilizers for soilless cultivation.

Velvet Arrowroot Leaf Spot

The infection usually starts from the leaf edges and tips. The spots grow from small to large, are irregular in shape, and are reddish-brown to gray-brown. The lower leaves of the plant are most severely affected.

Prevention and control methods: Spray Bordeaux mixture with equal amounts of lime for prevention and control.