The damage produced by these mites is expressed in a wide variety of symptoms. Some
mites cause distortion of developing buds while others damage the leaves or flowers. Leaf …

Four species of gall-mites found in Oregon are considered in this paper: viz., Eriophyes pyri,
Pagst.,(pear-leaf blister mite), E. vitis, Land.,(grape-leaf mite), E. tristriatus, var. erineus …

At the Nevada Test Site an abnormality was observed in branch tips and young leaves of a
globemallow, Sphaeralcea grossulariaefolia (Hook. and Arn.) Rydb. In infested plant parts …

Figure 1: Thickening of the petiole produced by poplar petiole gall aphids. Photograph by D.
Leatherman. which produces a cone-like gall on spruce. See fact sheet 5.534, Cooley …

Galls are commonly found on urban trees. Induced by oviposition of insects and other
arthropods, galls develop from woody tree tissues, forming shelters for developing larvae …

Large, black perennial trunk galls occur on trembling aspen (Populus tremuloides) in
localized areas of Alberta and British Columbia. The cause of many of these galls is …

Two rates of three insecticides Sevin, Kelthane, and Dursban-were tested against mites in
a cottonwood nursery at Stoneville, Mississippi. Trees were in their 1st growing season and …

An account is given of the results of biological observations and control tests carried out in
1973-74 in Piedmont on Phytoptus avellanae Nal., one of the most important pests of hazel …

The authors have been informed by HH Keifer that he considers that the plum tree gall mite
long known as Aceria phloeocoptes (Nal.) should be placed in the genus Acalitus. Aceria …

Eriophyid mite species cause a variety of pouch galls on red, sugar and silver maples.
Pouch gall formation, a localized growth reaction of the infested plant, occurs as a result of …