Leaf spot is a common and sometimes serious disease of sour cherries in the Northeast. In wet years, high levels of infection can cause trees to defoliate by mid-summer, leading to inferior crop quality, significantly ...

Black knot is a common and often serious disease of plum and prune trees in New York. Once established, the disease becomes progressively more severe each year unless control measures are taken. Infected limbs and twigs ...

The apple maggot (AM), a native of eastern North America, originally bred in large fruited hawthorns (Crataegus sp.). Later, it adopted apple as another host, and it has become a major fruit pest in the northeastern United ...

The tarnished plant bug is found throughout North America, but it is primarily a pest in temperate nondesert areas. It feeds on more than fifty economically important plants , including alfalfa , cotton, strawberries, ...

Sooty blotch and fly speck are the two most common “summer diseases” of apples in the Northeast; they are also problems on pears. Although caused by two different organisms, the diseases often occur together since both are ...

The European apple sawfly is an introduced pest that was first noted in North America infesting crabapples on Long Island (Farmingdale, N.Y.) and Vancouver Island (Victoria, B.C.) during 1939 and 1940, respectively. Since ...

The codling moth (CM) is a pest introduced from Eurasia. The larvae feed on the fruit of a wide range of host plants including apple, pear, quince, hawthorne, crabapple, and walnut. CM completes 1.5-3.5 generations annually, ...

Perennial canker (also called Valsa canker, Cytospora canker, Leucostoma canker, and peach canker) is one of the most common and debilitating diseases of peach trees in the Northeast. It also occurs regularly on sweet ...

Phytophthora root and crown rots (sometimes called collar rot) are common and destructive diseases of fruit trees throughout the world. In New York, apple, cherry, peach, and apricot trees are usually attacked, whereas ...

Mullein plant bug (MPB) and apple brown bug (ABB) are occasional pests of apple and pear in New York. Because they occur in the same place at the same time and cause the same kind of damage, they are collectively referred ...