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In 1984, CIAT continued the selection of bean germplasm tolerant to acid soils under low P and high Al conditions. A 3- stage screening system was used for bean lines from Central American adaptation nurseries, BGMV lines, pre-VEF lines, and advanced lines of the EP 84. Screening was done in rand...

En 1984, CIAT continuo la seleccion de germoplasma de frijol tolerante a suelos acidos en condiciones de bajo P y alto Al. Se utilizo un sistema de seleccion de 3 etapas para lineas de frijol de viveros de adaptacion de America Central, lineas de BGMV y lineas antes de pasar al VEF y lineas avanz...

The CIAT Bean Program uses a 3-stage progeny evaluation program asfollows: (a) the VEF, which in 1984 contained 1004 entries distributed in 10 groups according to seed color and size, growth habit (bush or climbing), and climatic adaptation; (b) the EP, which consisted of 446 entries and 38 contr...

El Programa de Frijol del CIAT utiliza un programa de evaluacion de progenie de 3 etapas como sigue: a) el VEF, que en 1984 contenia 1004 entradas distribuidas en 10 grupos segun el color y tamano de la semilla, habito de crecimiento (arbustivo o voluble) y adaptacion climatica; b) el EP, que con...

During 1984, intensive on-farm trials were conducted in northern, southern, and central Narino, Colombia, and emphasis was given to the continuation of var. trials and their expansion to determine economic levels and to verification trials. In northern and central Narino, a limited no. of verific...

Durante 1984 se realizaron intensos ensayos a nivel de finca en el norte, centro y sur de Narino, Colombia; se dio enfasis a la continuacion de los ensayos var. y a su expansion para determinar los niveles economicos y a los ensayos de verificacion. En el norte y centro de Narino se sembraron un ...

Two bean cv. were exposed to known levels of attack of nymphs and adults of Empoasca kraemeri for 14-day periods at different growth stages. On av., Diacol-Calima and EMP 81 suffered a yield loss of 16.5 and 14.6 kg/ha, resp., per insect/leaf/14-day period. A study of the insect complex attacking...

Se expusieron 2 cv. de frijol a niveles conocidos de ataque de ninfas y adultos de Empoasca kraemeri durante periodos de 14 dias en diferentes estados de desarrollo. Diacol-Calima y EMP 81 en prom. sufrieron una perdida de rendimiento de 16.5 y 14.6 kg/ha, resp., por insecto/hoja/periodo de 14 di...

Primary emphasis is being placed on a search for genotypes with erect architecture adapted to narrow row spacings and high populations and which show marked yield increases under intensive agronomic management. This research strategy is complemented by studies on specific problems such as exploit...

Se ha dado enfasis fundamental a la busqueda de genotipos con arquitectura erecta, adaptados a espacios estrechos entre hileras y altas poblaciones y que muestren incrementos notables en rendimiento bajo manejo agronomico intensivo. Esta estrategia de investigacion se complementa con estudios sob...

The 3-stage progeny evaluation program at CIAT tested 1902 materials (67.4 percent new entries) in 1986, distributed as follows: 1st stage (bean evaluation nursery-VEF), 1282 entries; 2nd stage (preliminary trials-EP), 435 entries; and 3rd stage (IBYAN), 185 entries. The following data are includ...

El programa de evaluacion de progenies en 3 etapas en CIAT probo en 1986 un total de 1902 materiales (67.4 por ciento nuevas entradas), distribuidos como sigue: primera etapa (vivero de evaluacion de frijol-VEF), 1282 entradas; segunda etapa (ensayos preliminares-EP), 435 entradas; y tercera etap...

During 1986 emphasis was given to testing promising bean germplasm for yields and the 1st materials bred at CIAT specifically for drought tolerance. Preliminary screening was performed under mild stress in the 1st semester, while exceptionally dry weather permitted evaluation under high levels of...

Durante 1986 se dio enfasis a pruebas de germoplasma promisorio de frijol por rendimiento y de los primeros materiales mejorados en CIAT especificamente por tolerancia a la sequia. La seleccion preliminar se efectuo en condiciones de estres leve en el primer semestre, en tanto que condiciones de ...

During 1986 screening of advanced bean lines for efficiency at low levels of P and for tolerance to high levels of Al saturation continued. A review of data from 8 yr. of screening indicated that the genetic variability of beans for these 2 characteristics is low. Furthermore, the data suggest th...

La seleccion de lineas avanzadas de frijol por eficiencia a bajos niveles de P y tolerancia a altos niveles de saturacion de Al continuo durante 1986. Una revision de datos de 8 anos de seleccion indico que la variabilidad genetica de frijol para estas 2 caracteristicas es baja. Ademas, los datos...

Close collaboration between CIAT and Brazil continued during 1986. Germplasm development was conducted through evaluating the jointly developed crosses in Brazil, rather than selecting the fixed lines in CIAT prior to shipment to Brazil. By the end of 1986, those segregating populations were in t...

La colaboracion estrecha entre CIAT y Brasil continuo durante 1986. Se realizo desarrollo de germoplasma a traves de la evaluacion de los cruzamientos desarrollados conjuntamente en Brasil, en lugar de seleccionar las lineas fijas en CIAT antes de su envio al Brasil. Hacia finales de 1986, estas ...

The Great Lakes Regional Bean Program works with the agricultural research institutions of Burundi, Rwanda, and Zaire. Advanced breeding lines were introduced as potential new var. for the region and/or as sources of resistance to angular leaf spot, anthracnose, Ascochyta leaf spot, halo and BCMV...