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High humidities can reduce the egg laying rate of the mites. Overhead watering will discourage them.
If you feed your plants with Maxicrop liquid tomato fertiliser, (Made from seaweed) this will prevent red spider attack.
Plants can be sprayed three times a year with a systemic insecticide containing malathion or pyrimiphos-methyl.
Spray with a contact insecticide such as rotenone. Several sprays should be made at 2 week intervals.
A green method is to use Neem Oil with Pyrethrin, which is made from chrysanthemums, can be safely used in vegetable gardens, fruit & nut trees & ornamentals. It provides immediate control of ants, aphids, mealy bugs and spider mites
Red spider mite can be controlled biologically in greenhouses by using their natural enemy, the predatory mite Phytoseiulus persimilis. See our suppliers list.
Mite damage on X Chamaelobivia and Cereus