Two-spotted spider mite
Tetranychus urticae
This description was machine-translated.
How to spot it
The two-spotted spider mite appears above all in dry heat in the greenhouse and sucks on the underside of the leaves, which makes the leaves first pale and speckled, then dull bronze coloured, before they dry up. With a heavy infestation, fine webbing covers the shoot tips. The animals, only 0.5 mm across, multiply at breakneck speed in the heat, so that a few mites can turn into a plague within two weeks.
Prevention
Keep the air humidity high, because regular misting and good watering noticeably disturb the heat loving mites, and ventilate the greenhouse to prevent heat building up. Check vulnerable plants early with a magnifying glass and, if they are infested, introduce predatory mites (Phytoseiulus persimilis) as biological antagonists; breaking out and disposing of individual infested leaves slows the spread.
Affected plants
These plants in our database are especially susceptible.
Duftpelargonie
Pelargonium graveolens
moderately susceptibleFächerahorn
Acer palmatum
slightly susceptibleGartenbambus
Fargesia murielae
slightly susceptibleJapanische Zierkirsche
Prunus serrulata
slightly susceptibleAubergine
Solanum melongena
Buschbohne
Phaseolus vulgaris var. nanus
Erdbeere
Fragaria × ananassa
Feuerbohne
Phaseolus coccineus
Gurke
Cucumis sativus
Paprika
Capsicum annuum
Stangenbohne
Phaseolus vulgaris var. vulgaris
Tomate
Solanum lycopersicum
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