One can quickly identify the spots as a blight due to the red colour of the center of the spots.Ĭommon blight and fuscous blight cannot be distinguished by eye. Pods are also infected which has devastating effect on yield quality. The small spots are not isolated just to the leaves. Over a short period the leaf tissue between the spots start to die of and turn yellow. These spots are caused by the bacteria penetrating and invading the stomata of the leaf.
Both cause small 1 mm translucent, water soaked pots on the leaves. Bacterial blight refers to two diseases Symptoms of common blightĪnd halo blight look the same initially.
Luckily it is restricted so a few climate zones but in some years it is devastating throughout the country. Bacterial blightĮvery grower that has ever grown green beans knows bacterial blight. Prudent and effective growers know when and where diseases infect where it reduces yields.ĭiseases are classified into three basic groups bacterial, fungal and viral. Although preventative sprays is the easiest way out it is more expensive. Just like other fast growing soft leaf vegetables, you have to be on your toes and look at warning signs. Here is a warning to all prospective growers green beans are quite susceptible to diseases. Beans are also an excellent source of antioxidants, fiber, protein, and vitamins for healthy diets, Miklas notes.ĪRS is USDA's chief in-house scientific research agency.Important green bean bacterial diseases and their control Per-capita consumption of edible dry beans is 6.8 pounds, according to ERS, with kidney beans finding favor in soups, salads, chili and other dishes. Department of Agriculture's Economic Research Service. The United States is the sixth-leading producer of edible dry beans, generating farm sales of $451 million in 2001-03, according to the U.S.
#Bean bacterial blight registration
They will post a registration notice with detailed information on USDK-CBB-15 in an upcoming issue of the journal Crop Science. James Smith, in ARS' Crop Genetics and Products Research Unit at Stoneville, Miss., and Shree Singh, with the University of Idaho at Kimberly, collaborated with Miklas on the new kidney bean's development, testing and evaluation. USDK-CBB-15 is the product of kidney bean crosses that Miklas made to incorporate resistance genes from the Great Northern bean cultivar "Montana Number 5" and the breeding germplasm line XAN 159. Miklas developed USDK-CBB-15 using marker-assisted selection, a method of detecting inherited genes that speeds the screening of plants for desired traits such as disease resistance. Severe outbreaks can cause yield losses of up to 40 percent in susceptible crops. In susceptible bean plants, the disease symptoms include large brown blotches with lemon-yellow borders on leaf surfaces and small, discolored seed in infected pods. However, resistant crops are the key defense, according to Phil Miklas, a plant geneticist in the Agricultural Research Service's (ARS) Vegetable and Forage Crops Production Research Unit in Prosser, Wash. Antibiotic treatment, clean-seed programs and sanitation are standard control measures. phaseoli, bacterial blight is an endemic disease affecting bean crops east of the U.S.
New Kidney Bean Germplasm Line Resists Common Bacterial Blight DiseaseĪ new germplasm line dubbed "USDK-CBB-15" is now available for breeding new varieties of dark red kidney beans that can resist common bacterial blight.Ĭaused by the pathogen Xanthomonas axonopodis pv. Click the image for more information about it. Geneticists Phil Miklas (left) and George Vandemark analyze results of quantitative polymerase chain reaction assays used to rapidly genotype bean plants for disease resistance.
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