European red mite
ulmi , is mainly a pest of fruit trees (apple, pear, plum and cherry). However, it can attack a large scale of other woody plants and is occasionally a problem [...] Rosaceae grown in greenhouses. It originates from Europe (as can be seen from the common name, European red mite) but is now distributed in all important apple [...] when these coalesce the leaves loose colour; this is often referred to as bronzing. When infestation is heavy, leaves can drop. Life cycle and appearance