See All Trees and Shrubs

Several varieties of currants and gooseberries are available and described below. Only varieties of black currants with good resistance to white pink blister rust are included.

Phomopsis twig blight and canker is a very common fungal disease in plantings. In addition to causing a twig blight and cankers, the fungus also causes leaf spots and a fruit rot.

The cranberry fruitworm, Acrobasis vaccinii (Riley), is found throughout the eastern United States wherever wild blueberries grow and can damage cultivated crops.

Blueberry varieties can be selected so that you have crops to be harvested from July through mid-September, if desired.

The plum curculio is dark brown, 1/4 inch long, and has four humps on its back and a long (one-third of the body length) snout projecting forward and downward from its head.

Black root rot a "disease complex," meaning that it can be caused by various pathogens combined with environmental stresses.

Crown and cane gall are bacterial diseases with no cure that constrain plant vigor and can cause plant death.

Learn the identification characteristics of the invasive tree-of-heaven and be able to distinguish it from the native look-alikes, black walnut and staghorn sumac.

Red, black, and purple raspberries, as well as blackberries, are easy to grow in the home garden.

Sooty blotch and flyspeck of apple are separate diseases affecting apple, crabapple, and pear trees. Oftentimes, both diseases are present on the same fruit.

Climatic irregularities govern the activities of the plum curculio, Conotrachelus nenuphar, a pest injurious to pome and stone fruits throughout the state.

Lesser peachtree borer is almost always associated with widespread incidence of Cytospora canker and, to a much lesser extent, pruning wounds, winter injury, and mechanical damage.

The Japanese beetle, Popillia japonica, is often the most important pest of tree-ripened peaches and can cause severe damage to other important crops.

Informational table showing the occurrence of insect and mite pests during the stone fruit growing season.

The green peach aphid, Myzus persicae, is a common pest of peaches in Pennsylvania. Peach trees are its primary host and overwintering source.

Plants may be known by different common names, and one name may refer to various plants within several species. Use the scientific or botanical name to properly identify plant material.

The spongy moth, Lymantria dispar, might attack fruit trees, especially apple trees, causing leaf damage. Damage can be severe on young trees, where defoliation can stunt or kill the plant.

The plant bugs and stink bugs that attack peaches, nectarines, apples, and pears feed on many different wild and cultivated plants, including numerous other horticultural and agronomic crops.

The diseases and insect pests of apples occur at different times during the growing season, depending on environmental and biological factors.

The peachtree borer, Synanthedon exitiosa, is a pest primarily of peach and nectarine trees, but it also attacks apricot, cherry, and plum trees.

Oriental fruit moth, Grapholita molesta, is a pest of most stone and pome fruits. In pome fruits, its appearance and injury is similar to that of the codling moth and lesser appleworm.

Walnuts and hickories produce the chemical juglone (5 hydroxy-1,4- napthoquinone), which is exuded from all parts of the plant.

Eastern redbud (Cercis canadensis) is a small, graceful tree native to the eastern and central United States.

The codling moth, Cydia pomonella, is a constant threat to apple production in Pennsylvania.

Brown rot can cause a blossom and twig blight, a canker, a leaf infection, and a fruit rot.