Aphids are small, sap-sucking insects. Some of them feed on more than one type of plant— for example, apple grass aphids feed on young new leaves and blossoms of apples
Oystershell scale (Lepidosaphes ulmi) belongs to a group of insects called the armored scales. The “armor,” is produced by a waxy secretion combined with the insect’s own body cast during
Over the past decade, spruce trees have suffered an abundance of issues. All species of spruce, including Colorado blue and white spruce, are being affected, but particularly concerning is the
Although long used as a groundcover, ivy is harmful for trees. It is not indigenous, and many species are aggressively invasive and displace native species. In North America, the most
The proper care of young trees can prevent many future problems. Browse our resources to learn more about how to best care for seedlings and young trees. Planting Ten steps
Boxwood blight is caused by the non-native fungus Calonectria pseudonaviculata. American and English boxwood (Buxus sempervirens) are most susceptible to this disease whereas many Asian species of boxwood, and hybrids
This year marked the fifth anniversary of the Bartlett Legacy Tree Program, an initiative promoting tree planting and stewardship in local communities through the distribution of seedlings in schools, at
“A Low-Maintenance and Frost-Hardy Tree” The walnut is a deciduous tree with bark that changes from green-brown when young to pale and fissured when mature. It was introduced by the
“An Iconic California Tree” An iconic tree of coastal California, redwoods are native to a thin coastal band from Oregon south through the Big Sur region of California, but are
“The Most Common Texas Oak” The post oak (Quercus stellata) is one of the most common oaks in Texas, and occurs from Texas and Oklahoma east throughout the southeast and
“An Ideal Ornamental for Hot Climates” Aleppo pine is native to the Mediterranean region, and is often grown there for timber and other wood products. In North America, it is
“A Hardy, Slow-Growing Evergreen” Japanese evergreen oak is native to Japan, South Korea, Taiwan, and parts of China. It was introduced in the United States in 1878. This species, Quercus
“A Prized, Historic Tree” White oak is the reigning tree over its growth range. Some of the largest and most famous trees are oaks. The wood has been highly prized
Pear trellis rust is caused by the fungus Gymnosporangium sabinae. It was introduced into the United States from Europe in the 1990s and has been progressively spreading through states in
Adult sawflies are often similar in appearance to flies or wasps. The larvae are also similar, though sawflies have one simple eye on each side of the head and five