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Among the bacterial diseases that attack beans are halo blight (Pseudomonas syringae pv. phaseolicola), which is distributed worldwide and survives in infected seeds and plant residue on the soil surface. Three to five days after infection, small water- soaked spots appear on the lower leaf surfa...
Entre las enfermedades bacterianas que atacan el frijol esta el anublo de halo (Pseudomonas syringae pv. phaseolicola) que se encuentra presente en todo el mundo; sobrevive en semillas infectadas y en residuos vegetales. Tres a 5 dias despues de la infeccion aparecen manchas acuosas en el enves d...
Seeds provide an efficient method for disseminating pathogenic organisms to different locations; more than 50 percent of the major bean diseases are seed borne. Mechanical damage, which may occur during harvesting, threshing and/or planting can affect seed viability, germination, and result in co...
La semilla constituye un metodo eficiente de diseminacion de organismos fitopatogenos a diversas localidades; mas de 50 por ciento de las principales enfermedades del frijol son transmitidas por la semilla. El dano mecanico que ocurre durante la cosecha, trilla y/o siembra tambien puede afectar l...
Many factors can severely affect beans during their growth cycle. Parasitic plants, such as Cuscuta epithymum and Cassytha filiformis, can reduce yields. Various environmental conditions including frost, extreme conditions of high or low MC, sudden changes in soil and air temp., and periods of in...
Muchos factores pueden afectar severamente el frijol durante su ciclo de crecimiento. Las plantas parasitas, tales como Cuscuta epithymum y Cassytha filiformis, pueden reducir los rendimientos. Diversas condiciones ambientales incluyendo las heladas, las condiciones extremas de exceso o falta de ...
Bean plants are exposed to many fungal diseases including Alternaria leaf and pod spot, Ascochyta blight, ashy stem blight (Macrophomina phaseolina), Cercospora leaf spot, Chaetoseptoria leaf spot, Diaporthe pod blight, downy mildew (Phytophthora nicotianae var. parasitica and P. phaseoli), Entyl...
Las plantas de frijol estan expuestas a muchas enfermedades causadas por hongos como la mancha foliar y de la vaina por Alternaria, el anublo por Ascochyta, la pudricion gris del tallo (Macrophomina phaseolina), la mancha foliar por Cercospora, la mancha foliar por Chaetoseptoria, el anublo de la...
White mold, caused by the fungus Sclerotinia (Whetzelinia) sclerotiorum, is distributed worldwide and has more than 300 hosts. It infects flowers, cotyledons, seeds, leaves, or injured plant tissue. The disease can be controlled by crop rotation, flooding, reduced seeding rates, fewer irrigations...
El moho blanco causado por el hongo Sclerotinia (Whetzelinia) sclerotiorum se halla presente en todo el mundo, con mas de 300 plantas hospedantes del patogeno; infecta las flores, cotiledones, semillas, hojas o tejido lesionado. El control de la enfermedad se puede hacer por rotacion de cultivos,...
In 1986, 5 commercial bean sites near Holyoke (Colorado, USA) were treated with 4 sprays of cupric hydroxide every 7 to 10 days beginning at least 2 wk. before flowering to (1) sample for the presence of Cu resistance in naturally-occurring epiphytic populations of Pseudomonas syringae pv. syring...
Investigations during 1984 and 1985 demonstrated that Pseudomonas syringae pv. phaseolicola (Psp) and Pseudomonas syringae pv. syringae (Pss) occur as epiphytes on dry beans in Colorado. Populations of syringae-type pseudomonads (STPs) were detected on volunteer bean plants throughout northeaster...
Results of the research on beans carried out by the Dept. of Plant Pathology and Weed Science of Colorado State U. (USA) are briefly summarized. Surveys in the spring of 1984 and 1985 found many wild beans infected with, and/or colonized by, populations of Pseudomonas syringae pv. phaseolicola an...
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