![]() ![]() Bur oak blight, caused by the fungal pathogen Tubakia iowensis.Ascochyta species and Alternaria triticina that causes blight in wheat Early blight of potato and tomato, caused by species of the ubiquitous fungal genus Alternaria.Bacterial seedling blight of rice ( Oryza sativa), caused by pathogen Burkholderia plantarii.Bacterial leaf blight of rice, caused by the bacterium Xanthomonas oryzae (Uyeda & Ishiyama) Dowson.Fire blight of pome fruits, caused by the bacterium Erwinia amylovora (Burrill) Winslow et al., is the most severe disease of pear and also is found in apple and raspberry, among others.Citrus blight, caused by an unknown agent, infects all citrus scions.Chestnut blight, caused by the fungus Cryphonectria parasitica (Murrill) Barr, has nearly completely eradicated mature American chestnuts in North America.Southern corn leaf blight, caused by the fungus Cochliobolus heterostrophus (Drechs.) Drechs, anamorph Bipolaris maydis (Nisikado & Miyake) Shoemaker, incited a severe loss of corn in the United States in 1970.Late blight of potato, caused by the water mold Phytophthora infestans (Mont.) de Bary, the disease which led to the Great Irish Famine.Accordingly, many diseases that primarily exhibit this symptom are called blights. For the barley blight, see Bacterial blight (barley).īlight refers to a specific symptom affecting plants in response to infection by a pathogenic organism.īlight is a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, or floral organs. More information can be found in the Integrated Management Guide for Commercial Apples in the Southeast.įeatured image from Penn State Department of Plant Pathology & Environmental Microbiology Archives, Penn State University, Bugwood."Bacterial blight" redirects here. After each cut, clean all tools with a solution of isopropyl alcohol or other disinfectant to avoid spreading the bacteria. In fall or winter, prune the diseased wood 6 to 8 inches below the cankers. Growers should prune diseased wood approximately 12 to 14 inches below visible cankers during the growing season. If a tree is infected with fire blight, all diseased tissue (blighted twigs and branches) should be removed as soon as possible to slow the spread of the disease. ![]() Having improper practices that produce rank, succulent growth with increase the possibility of the disease developing. Beginning in late winter to early spring and continuing through the growing season, growers should remove all root sprouts and suckers from trees. Do not cultivate pear and apple orchards late in the season and do not severely prune susceptible cultivars. Growers should regulate plant growth and apply fertilizers so that moderate shoot growth is maintained. Having proper cultivation and fertilization management practices is key to prevention. Aside from planting resistant varieties, there are other steps grower should take to prevent this disease. The best way to reduce the chances of fire blight is to purchase varieties of apple and pear trees that have some resistance to the disease. Control OptionsĪ control program combining resistant varieties, sound cultural practices, sanitation, fertilization, and pesticides is needed to protect plants from fire blight. Badly diseased trees and shrubs are usually disfigured and may even be killed by fire blight. The term fire blight describes the blackened, burned appearance of damaged flowers, twigs, and foliage. Fire blight is a bacterial disease that affects apples, pears, and other fruit and ornamental plants. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |