Technical reports

  • All 320
  • Environmental factors and damage 50
  • Fertilization and soil management 34
  • General information 106
  • Insects and pests 82
  • Plant health care 91
  • Tree diseases 81
  • Tree management and consulting 15

Norway maple (Acer platanoides) is a medium- to large-sized shade tree found in many northern landscapes. No…

Oak leaf skeletonizer

Canada, United States

The oak-leaf skeletonizer, Bucculatrix ainsliella Murt., periodically reaches outbreak proportion, causing significan…

Oak leafroller

Canada, United States

The oak leafroller, Archips semiferanus, is one of a group of spring-feeding caterpillars that roll, fold, o…

Obscure scale

Canada, Great Britain, Ireland, United States

Scales are insects that use their needle-like mouthparts to pierce their host and draw food from nutrient-rich tissue…

Olive knot

Canada, Great Britain, Ireland, United States

Olive knot is caused by a bacteria that produces a plant growth hormone (indoleacetic acid, IAA) which causes the oli…

Optimum soil pH ranges

Canada, United States

Soil pH affects the nutrient uptake ability of trees and shrubs. When pH values are above or below the optimum range,…

Pear thrips

Canada, United States

The pear thrips, Taeniothrips inconsequens (Uzel) is a tiny insect in the order Thysanoptera. There are over 600 spec…

Pear trellis rust

Canada, United States

Pear Trellis Rust (PTR) was introduced into the United States from Europe in the 1990’s and has been progressiv…

Pecan (Carya illinoinensis), the largest of the hickories, is native to about 150 Texas counties and can be …

Pecan (Carya illinoinensis), a type of hickory, is grown throughout the southeastern United States as a comm…