The grape berry moth, a major pest of cultivated grapes, is native to eastern North America where it originally occurred on wild grapes. Its present range of distribution is the territory east of the Rocky Mountains, ...

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 ...

Downy mildew, a fungal disease native to North America, attacks most species of wild and cultivated grape. The disease was inadvertently introduced into European vineyards in the late 1870’s where it devastated the European ...

Grape tumid galls, also called grape tomato galls, are caused by larvae of a small fly known as the grape tumid gallmaker (GTG). This pest is native to the northeastern United States and southeastern Canada. It infests ...

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 ...

Eutypa dieback of grapevines, formerly called “dead arm,” was for many years thought to be caused by the fungus Phomopsis viticola. Recently, however, another fungus, Eutypa armeniacae (imperfect stage: Cytosporina), was ...

Apple stem pitting virus (ASPV) is a latent virus of pome fruits with worldwide distribution. In addition to apple, ASPV can affect pear and quince. Similarly to other latent viruses of pome fruits, infections with ASPV ...

The grape cane gall maker is one of two Ampeloglypter species which can damage new shoot growth in the spring. This small snout beetle is apparently present throughout eastern and midwestern North America and has caused ...

The larvae of several Lepidoptera are collectively called green fruitworms because of their general appearance and tendency to damage apple and pear fruit. One species, Orthosia hibisci, which will be referred to as the ...

Grapevine red blotch disease (GRBD) is a recently recognized viral disease. It was first described on Vitis vinifera cv. Cabernet Sauvignon at the University of California Oakville Research Field Station in 2008, but the ...