Red SPIDER MITE - There are two types : the FRUIT tree RED SPIDER MITE on broad-leaved trees and the CONIFER spinning mite on conifers. Indications of infection are an unhealthy browning of the foliage accompanied by a silky webbing. Tiny spider-like mites may also be seen on leaf undersides. These can cause serious damage and should be sprayed with INSECTICIDE - ideally MALATHION or DERRIS.  Alternative type is the Glasshouse Red Spider Mite or  "Web-forming Tetranychus".