There are many types of Tea plant diseases and pests, with over a dozen being the most common.

(1) Categorized by the part of the plant they affect

Tea plant diseases can be divided into two major categories: Bud and Leaf diseases, and root and stem diseases. Common bud and leaf diseases include tea blister blight, anthracnose, and tea white spot disease. A common root and stem disease is lichen moss.

(2) Categorized by their method of harm

Leaf-eating pests These pests directly consume the leaves of tea plants, causing damage that appears as notches or holes, leaving the leaves incomplete. The main pests in this category include the tea looper (commonly known as the arch-backed caterpillar), tea caterpillar, tea prickly leaf moth (commonly known as the stinging moth), and the tea striped weevil (commonly known as the flower hen). Some pests spin silk to roll up tea leaves or tie several shoots together to form a protective shelter, hiding inside while they feed. The main pests in this category include the tea leaf roller, tea small leaf roller, and tea slender leaf roller.

Sap-sucking pests These pests harm tea plants by sucking sap, causing symptoms such as bud and leaf shrinkage, growth stagnation, leaf browning, or leaf drop. The main pests in this category include the tea green leafhopper, black scale, tea yellow thrips, tea aphid, green stink bug, and scale insects. Mites, commonly known as red spiders, also harm tea plants by sucking sap. They are extremely small and generally cannot be seen with the naked eye. When tea plants are attacked by mites, the leaves lose their luster, buds and leaves shrink, and the texture of the leaves hardens. In severe cases, the back of the leaves may change color, turning rust or brown. The main tea plant mites are Citrus red mite and tea tarsonemid mite.