Glasshouse red spider mite is a common sap-feeding mite that can cause mottled leaves and early leaf loss on a wide range of greenhouse and garden plants. It is also known as two-spotted spider mite.

Common name Glasshouse red spider mite or two-spotted spider mite

Plants affected Many greenhouse and garden plants, and houseplantse

Symptoms Mottled foliage and early leaf fall

Active March to October

What is Greenhouse Red Spider Mite

Glasshouse red spider mite can be one of the most troublesome problems of greenhouse plants and houseplants. It can also attack garden plants during summer. It is a sap-sucking mite that attacks the foliage of plants, causing a mottled appearance, and in severe cases, leaf loss and plant death.

It attacks a wide range of houseplants and greenhouse plants, both ornamentals and edibles, including: vines, peach, nectarines, cucumbers, tomatoes, aubergines, peppers, Fuchsia, Pelargonium, poinsettias, orchids and Impatiens. The host range of this mite is so wide that few plants are completely immune.

Glasshouse red spider mite thrives in warm, dry conditions, and is usually only a problem from March to October, but damage can occur at other times in a heated greenhouse. It can also cause problems outdoors in summer, especially in hot, dry weather.


You may see the following symptoms:

On leaves: Plants infested with glasshouse red spider mite show a fine pale mottling on the upper leaf surface. The underside of the leaves have many tiny yellowish green mites and white cast skins and egg shells. These are more easily seen with the aid of a x10 hand lens

On plants: In heavy infestations, you may see fine silk webbing on the plants, and the leaves lose most of their green colour and dry up or fall off. Heavily infested plants are severely weakened and may die