Red spider, called spider mite, any of the plant-feeding mites of the family Tetranychidae. Red spiders are a common pest on houseplants and agriculturally important plants. The life cycle of the red spider from egg to adult takes about three weeks. Adult mites measure about 0.5 mm in length. Contrary to what their name suggests, all species are not red in colour; some are green, yellow, or orange. The mites are sometimes mistaken for small spiders because of their habit of spinning a loose silk webbing on infested plants. A heavy infestation can cause complete defoliation. Spider mites have become difficult to control because of their increasing resistance to pesticides.
Red spiders damage:
The mites suck sap from cells on the underside of plant leaves, in the early stages, characteristic white speckles can be seen from the upper leaf surface. Mite numbers increase these white speckles will increase in number, the leaf will take on a bleached appearance and die.The mites are found in highest numbers on the underside of leaves although you may need a magnifying glass to see them, as the population builds you will start to see webs and aggregations of mites at certain sites, usually the growing points of the plant.
Red Spider Mite Life Cycle:
The mites go through 5 development stages. Egg to adult takes about 14 days at 21ºC, or less than a week at 30ºC. Eggs are laid on the underside of leaves. Each adult female can produce more than 100 eggs in 3 weeks. They reproduce at alarming rates 10 spider mite in May are capable of becoming 1,000 by June & 100,000 by July. High humidities can reduce the egg laying rate of the mites. During the autumn, when day lengths shorten the mites turn deep red in colour and migrate from the plants to hibernate in crevices within the glasshouse structure. Red spider mite can overwinter without feeding and re-emerge in the spring and summer to re-infest plants.
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