Phytophthora Root and Crown Rot of Fruit Trees (2008)
Phytophthora root and crown rots (sometimes called collar rot) are common and destructive diseases of fruit trees throughout the world. Above-ground symptoms vary between tree species, but generally include reduced tree vigor and growth, yellowing or chlorosis of leaves, and eventual collapse or death of the tree. (HYG-3029-08)
Bacterial Crown Gall of Fruit Crops (2008)
Crown gall is caused by the bacterium Agrobacterium tumefaciens. This bacterium has the widest host range of any plant pathogen. All fruit crops grown in Ohio are susceptible. The disease is particularly destructive on brambles (raspberries and blackberries) and grapes. (HYG-3301-08)
White Pine Blister Rust on Currants and Gooseberries
White pine blister rust is not a serious disease of currants and gooseberries; however, it is a very serious disease of white pines (Pinus strobus). White pine blister rust causes significant damage in pine forests by forming cankers on the branches of white pines. These cankers ultimately kill the trees. (HYG-3205-08)
Grafting Tomatoes to Improve Plant Health
Tomatoes are an important crop to backyard gardeners and commercial producers. Ideal tomato plants have excellent foliage, robust production, marketable fruit characteristics and disease resistance. Thousands of tomato varieties are available for planting. Narrowing down which varieties to plant can be challenging. Even more challenging is finding a tomato variety that meets the needs of the local market and is resistant to disease. One way to meet that need is to graft your favorite variety onto a disease-resistant rootstock.
Hop Downy Mildew (2018)
Downy mildew is the most wide spread and destructive disease of hops (Humulus lupulus) in the Midwest and Northeastern United States. Downy mildew is caused by the fungal-like pathogen Pseudoperonospora humuli and is most severe during wet weather and mild temperatures. The disease is systemic and can cause significant yield and quality losses annually.