Red spider mites

Time to act:

Jun, Jul, Aug, Mar, Apr, May, Dec, Jan, Feb, Sep, Oct, Nov

These tiny, sap-sucking pests may be only 0.5mm long but they can wreak havoc in a greenhouse or on houseplants indoors. For most of the year they are a pale green colour with two dark spots on their back; it's only in autumn and winter that they turn orange-red. They thrive in hot, dry conditions so life in the greenhouse, or a centrally-heated home, suits them just fine. If the temperature stays above 12 celsius, they can breed all year round.

Symptoms

Leaves and stems of plants covered in fine webbing. The upper surface of the leaf is mottled, while mites and eggs can be seen with a magnifying glass on the undersides of leaves. The plant may die.

Find it on

houseplants, greenhouse plants, also outdoors on fuchsias, runner beans, busy lizzies, grape vines

Advertisement

Organic

Improve air circulation in the greenhouse and boost levels of humidity by misting plants with tepid water and standing bowls of water on the benches between plants. Damping down the floor of the greenhouse with water will also help. When daytime temperatures in the greenhouse hover steadily around 21 celsius, you can try releasing the predatory mite, Phytoseiulus persimilis on to your plants. Alternatively, use sprays containing, fatty acids or plant oils.

Advertisement

Discover more ideas and inspiration

Related content

Cabbage white caterpillars

Caterpillars

Scale insects

Whitefly

Related offers

Offer

3 for 2, plus free seeds

Order any three packs of veg plants from a special selection at Mr Fothergill's and the cheapest will be free. Plus, you'll also receive a collection of herb seeds (worth over £15) free with your order.

Use code: GWF17MAR

Order now

Offer

Save on tomatoes

Buy a collection of five delicious tomato varieties for just £6.99, or buy 10 plants (two of each variety) for just £9.99. Plus, save on a tomato growing kit when you spend over £10.

Order now

SAVE 10%

Subscriber only content

Save on grafted veg

Grow your own cucumbers, tomatoes, aubergines and more on vigorous grafted plants. Subscribers save 10 per cent on the range of great grafted veg plants at Suttons - simply enter the offer code at checkout.

Unlock now