Since 1967, many diseases have been associated with mycoplasma- like microorganisms (MLM), especially when symptoms have been characterized by general plant chlorosis, stunting, excessive proliferation of branches (witches' broom), bud proliferation and disorders of floral organs (phyllody and vi...
Desde 1967, muchas enfermedades se han asociado con los microorganismos semejantes a micoplasmas (MSM) especialmente cuando los sintomas se han caracterizado por una clorosis general de la planta, raquitismo, proliferacion excesiva de ramas (superbrotamiento) y desordenes en los organos florales ...
Bean crops are attacked by several viruses transmitted by insects among which are: (1) beet curly top virus (Circulifer tenellus); the best control measure is the utilization of resistant var.; (2) the tobacco yellow dwarf virus (Orosius argentatus); (3) the tomato spotted wilt virus, which is tr...
El cultivo del frijol es atacado por varios virus transmitidos por insectos, entre los cuales estan: 1) el virus del apice rizado de la remolacha (Circulifer tenellus); la mejor medida de control es el uso de var. resistentes; 2) la muerte de verano del frijol (Orosius argentatus); 3) el virus de...
The following insect pests attacking bean seedlings are briefly described and the damage they cause is mentioned: Delia platura, Gryllus spp., Phyllophaga spp., Elasmopalpus lignosellus, Slugs, and cutworms. Some cultural and chemical control measures are indicated. (CIAT)
Se describen brevemente los siguientes insectos plaga que atacan las plantulas del frijol y se menciona el dano que causan: Delia platura, Gryllus spp, Phyllophaga spp., Elasmopalpus lignosellus, babosas y trozadores. Se indican algunas medidas de control cultural y quimico. (CIAT)
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...
Allen, David J.
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Dessert, M.
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Trutmann, P.
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Voss, J.
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[Common beans in Africa and their constraints]
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Common beans in Africa and their constraints
Melo, Elsa Liliana
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Ortega, Carlos Alberto
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[Potential for biological control in the management of cassava pests]
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Potential for biological control in the management of cassava pests
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...