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Beans are grown in Africa in a wide range of environments, mainly in the cool highlands of central and tropical eastern Africa, leading to a diversity of cropping systems and agronomic constraints to production. Beans are cultivated for large-scale production or home consumption either in monocul...

El frijol se cultiva en Africa en un amplio rango de ambientes, principalmente en las areas montanosas templadas de las regiones central y oriental tropical de Africa, lo cual supone diversos sistemas de cultivo y limitaciones agronomicas a la produccion. El frijol se cultiva para produccion en g...

One of the most important bean-production constraints in tropical and subtropical Africa is the wide range of insect pests, which attack every part of the bean plant (from roots to pods and seeds) causing heavy losses either in the field or in storage. Losses can be up to 100 percent depending on...

Una de las mas importantes limitaciones a la produccion del frijol en Africa tropical y subtropical es el amplio rango de insectos plaga que atacan cada parte de la planta de frijol (raices, vainas, semillas) causando grandes perdidas en el campo o en almacenamiento. Las perdidas pueden ser de ha...

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...

The biology, damage caused, and control (cultural, chemical, and var. resistance) of the following insect pests attacking bean plant foliage are described: chrysomelids, Empoasca kraemeri, Epilachna varivestis, Trichoplusia ni, Bemisia tabaci, aphids, Tetranychus spp. Polyphagotarsonemus latus, A...

Se describen la biologia, el dano que ocasionan y el control (cultural, quimico y resistencia var.) de los insectos plaga que atacan el follaje de las plantas de frijol: crisomelidos, Empoasca kraemeri, Epilachna varivestis, Trichoplusia ni, Bemisia tabaci, Afidos, Tetranychus spp., Polyphagotars...

A description is given of the different manners in which insecticide toxicity is expressed (lethal dose, continuous dose, lethal time, lethal concn., and effective dose), insect resistance to chemicals, insecticide types, application, and the role of chemical control in integrated pest control. I...

Se describen las diferentes formas en que se expresa la toxicidad de los insecticidas (dosis letal, dosis continua, tiempo letal, concn. letal y dosis efectiva), la resistencia de los insectos a los productos quimicos, tipos de insecticidas, aplicacion y el papel del control quimico en el control...

During 1981, the efforts to use meristem-culture methods have continued, together with thermotherapy for recovering healthy clones. Frog skin disease was eradicated up to 100 percent in different cassava clones during various propagation cycles through the culture of small meristem tips. A routin...

The principal objective of on-farm trials is to provide feedback to the technology generation/var. improvement process. The trials carried out by CIAT and the Instituto Colombiano Agropecuario on farms in the Colombian regions of Huila, (10 farms in 1980 A), Antioquia (14 farms in 1979 A and 1980...

El objetivo principal de los ensayos a nivel de finca es proveer informacion de retorno al proceso de generacion de tecnologia y mejoramiento var. Se describen en detalle los ensayos realizados por el CIAT y el Instituto Colombiano Agropecuario en fincas de las regiones colombianas del Huila (10 ...