Spider mite is a pest that affects various crops. Well-known spider mites include: two-spotted spider mite (Tetranychus urticae), carmine spider mite (Tetranychus cinnabarinus) and citrus red spider mite (Panonychus citri). The spider mites belong to the arachnids. Their body forms a single entity. The spider mite pierces leaf cells and by sucking they can easily damage flower and leaves. The ornamental value can be substantially reduced. The spider mite develops quickly in warm, dry conditions. In severe infestations the web threads are visible. The spider mite is clearly visible due to its red colour.
The spider mite has five development stages. The female spider mite lays eggs (usually at the base of the leaf) after which the larval stage begins. After this larval stage, two nymphal stages follow, culminating in an adult.
- Leaf damage because the spider mite sucks the leaves to feed. This has consequences for the photosynthesis and the ornamental value (of leaves and flowers in particular). Yellow-brown spots develop.
- The ornamental value is reduced by the web threads.