The vine leaf blister mite has been recorded in Western Australia for a number of years, but in the last two seasons it has become very common on backyard vines in the metropolitan area and has appeared in some commercial vineyards. This mite is of European origin, but it has now become established in the United States of America and various other grape-growing countries. It is believed to have reached Australia from America some time during the decade 1910 to 1920 (Froggatt, 1920) and since then it has gradually spread over the continent
