Helga Blanco-Metzler

Helga Blanco-Metzler
University of Costa Rica | UCR · Centro de Investigaciones en Protección de Cultivos (CIPROC)

PhD

About

36
Publications
20,539
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105
Citations

Publications

Publications (36)
Book
Full-text available
It is a practical guide for the recognition and management strategies of some pests and diseases in vegetables, aimed at small producers.
Chapter
Home garden experiences in Costa Rica Helga Blanco-Metzler and Alex Diaz Porras This chapter presents the results of two projects carried out in the northern region of Costa Rica that were designed to provide sustainable production alternatives to small agricultural property holders, to reduce hunger and to achieve food security. Such alternatives...
Chapter
This book contains 32 chapters focusing on the biological control of many invasive pests, diseases and weeds and ensuring a healthy and sustainable food supply in various countries in Latin America and the Caribbean. The rich history of biological control in the region is documented and steps for the future success of the biological control of inva...
Book
Since 1915 Costa Rica has experienced biological control strategies, and has developed very important information and progress in research, but nowadays it is an urgent need to take it to the field on large scales.
Article
Full-text available
Botanical insecticides manufactured under the name of spinetoram, Solaris 6 SC® (75 ml.ha-1) and Capsoil 9,82 EC® (Capsicumm annum + mustard (Sinapis alba) + garlic (Allium sativum) (2 l.ha-1) were evaluated by comparing them with two homemade extracts: garlic extract + neem (Azadirachtaindica) + detergent (20 ml.l-1 water) and garlic extract + ore...
Article
Full-text available
A study was conducted to reveal the causes for Aleurodicus dispersus outbreak in commercial banana plantations in Costa Rica. Biotic and abiotic factors affecting the abundance of the spiralling whitefly were determined. Four nymph parasitoids and nine predators were found to affect A. dispersus population. Seventeen families of host plants for A....
Article
Full-text available
Liriomyza huidobrensis (Blanchard) is native to South America but has expanded its range and invaded many regions of the world, primarily on flowers and to a lesser extent on horticultural product shipments. As a result of initial invasion into an area, damage caused is usually significant but not necessarily sustained. Currently, it is an economic...
Article
Full-text available
The effect of three weed management systems -macadamia husk as a mulch, bare ground and weeds growing freely - on the population ofthe nutborer, Ecdytolopha torticornis, were studied from June to September 1992 at Oriente Farm, Turrialba, Costa Rica. The smallest number of the nutborer's eggs was recorded on the bare ground treatment, followed by t...
Article
Full-text available
Se estudió el efecto del contenido de nitrógeno, de los compuestos secundarios (taninos y prohantocianidinas) y de la materia seca de 4 clones de macadamia y de los diferentes estados de desarrollo de la nuez, sobre la abundancia de Gymnandrosoma aurantianum. El contenido de nitrógeno varió entre clones y los estados de desarrollo de la nuez, siend...
Article
Full-text available
Se evaluaron 6 productos para el control de Dysmicoccus brevipes en piña (Ananas comosus). El ensayo de laboratorio se realizó en el Laboratorio de Biocontroladores de la empresa BioEco Natural S.A., ubicada en Aguas Zarcas, San Carlos, mientras que los ensayos de campo se realizaron en una plantación comercial de piña, en Venecia de San Carlos. En...
Article
Full-text available
Se evaluó el efecto de seis jabones comerciales: Cristalin®, Brasso Antigrasa®, Barra Extra Verde®, Doña Blanca Barra®, Rinso® y Axión Limón® sobre las poblaciones de Aulacaspis yasumatsui. El número de ninfas I vivas fue significativamente menor cuando se utilizó Cristalin® que cuando se utilizó Rinso® y el testigo. Se encontraron diferencias alta...
Article
Full-text available
The study evaluated 6 products for Dysmicoccus brevipes control in pineapple production (Ananas comosus). The laboratory test was conducted in the BioEco Natural Company S.A., biocontrol laboratory in Aguas Zarcas, San Carlos, while the field trials were conducted in a commercial pineapple plantation in Venecia, San Carlos. In the laboratory test B...
Article
Full-text available
The effect of six commercial brands of soap, Cristalin®, Brasso Antigrasa®, Barra Extra Verde®, Doña Blanca Barra®, Rinso® and Axión Limón® on the Aulacaspis yasumatsui populations was studied. The number of alive crawlers was significantly lower when using Cristalin® than with Rinso® and the control. Significant differences between alive adult fem...
Article
Full-text available
ABSTRACT. Four protective bagging materials were evaluated (waxed paper, nylon fabric, Taiwan bag and telephone book paper) for guava fruit fly control. The study was carried out in Alajuela, Costa Rica during 2007. Percentage of protected fruit was nylon > Taiwan > waxed paper > telephone guide paper. The longest duration of the bag in the field w...
Article
Full-text available
La broca del café Hypothenemus hampei (Ferrari) es considerada la plaga de mayor importancia en el cultivo del café a nivel mundial. Al igual que muchos otros insectos, el comportamiento de la broca se ve modificado por distintas señales olfativas, lo cual ha impulsado la investigación en el campo de la olfatometría, por medio de una gran variedad...
Article
Full-text available
The coffee berry borer, Hypothenemus hampei is considered to be a major pest in coffee producing countries worldwide. As in many insects, the behavior of the coffee borer is modified through aromatic signals. This has triggered important research within the different approaches of olfactometry. Two new innovative designs of olfactometers were evalu...
Article
Full-text available
The main problem in guava production is fruit fly damage; this insect feeds inside the fruit and facilitates the entrance of pathogens and fruit drop. This study evaluated different materials used for making protective bags for guava fruits in order to reduce fruit fly damage and pathogen presence, as well as to extend their life expectancy in the...
Article
Full-text available
Biological control on crop infesting insects represent an useful method in modem agriculture. A search for parasitoids of the macadamia nutborer was carried out during a three year study, and their effect on the population fluctuation of the borer was determined. An egg parasitoid belonging to the family Trichogrammatidae and four larval parasitoid...
Article
Full-text available
El presente trabajo se efectuó con el objetivo de identificar microorganismos asociados al fruto de la guayaba en frutos embolsados de una plantación comercial en Carrillo de Poás, Alajuela, Costa Rica, durante la época seca y lluviosa del año 2007. Se realizaron aislamientos en el laboratorio para determinar la presencia y tipo de microorganismo a...
Article
Full-text available
Predators play a fundamental role in integrated pest management programmes, yet are often underutilized because of a lack of information about their effect on pest populations. In this study, the mortality of larvae and pupae of Ecdytolopha torticornis in a macadamia orchard in Costa Rica, caused by predators, was quantified during the period betwe...
Article
Full-text available
Se estudió el efecto de 3 condiciones de luz (completa-548,63 W m-2, media luz-280,02 W m-2, sombra-76,38 W m-2), el uso de repelentes (ajo más chile, neem y pichichío) y el uso de bolsas de exclusión, en el daño de Cholus pilicauda a las flores de ginger rosado (Alpinia purpurata) en una plantación asociada con poró (Erythrina poeppigiana). El emb...
Article
Full-text available
RESUMEN El análisis multivariado, permitió caracterizar el nivel de infestación causado por el picudo en tres localidades productoras de chile dulce en el Distrito de Cervantes, Costa Rica. Mediante el uso de Microsoft® Visual Basic, se elaboró un programa que permite la predicción de infestación a partir de variables climáticas, el monitoreo...
Article
Full-text available
Vertical distribution of eggs of the macadamia nutborer Ecdytolopha torticornis Meyrick (Lepidoptera: Tortricidae) and its preference of oviposition sites within and between macadamia cultivars were studied in Turrialba, Cartago, Costa Rica, in 1992 (N = 6,939). E. torticornis eggs were found throughout the foliar parts of the tree, but fewer eggs...
Article
Full-text available
A new species of cecidomyiid, Clinodiplosis capsici Gagne, is reported from cultivated sweet and hot pepper in Costa Rica, Guadeloupe, and French Guiana where it appears to have potential as a serious pest. Adults, pupae, and larvae are described, illustrated, and compared to other Clinodiplosis species.
Book
Full-text available
Las Guias de Manejo Integrado de Plagas representan uno de los poductos finales del Proyecto MIP, en las que se resumen los resultados de las investigacione en fitoproteccion y manejo del cultivo, llevadas a cabo en Centroamerica y Panama en los cultivos de chile, maiz, repollo y tomate. Al poner a disposicion de las instituciones nacionales estas...
Book
Full-text available
https://books.google.com/books?id=-nEOAQAAIAAJ&pg=PA80&lpg=PA80&dq=guia+para+el+manejo+integrado+de+plagas+del+cultivo+de+repollo&source=bl&ots=4nWpQDGaJw&sig=633LwBA-3qlbJTRbctKk2Pf-bKY&hl=en&sa=X&ei=JEHaVKzqF8nYggS_h4CoBg&ved=0CB4Q6AEwAA#v=onepage&q=guia%20para%20el%20manejo%20integrado%20de%20plagas%20del%20cultivo%20de%20repollo&f=false
Book
Full-text available
Las Guias de Manejo Integrado de Plagas representan uno de los poductos finales del Proyecto MIP, en las que se resumen los resultados de las investigacione en fitoproteccion y manejo del cultivo, llevadas a cabo en Centroamerica y Panama en los cultivos de chile, maiz, repollo y tomate. Al poner a disposicion de las instituciones nacionales estas...
Book
Full-text available
Las Guias de Manejo Integrado de Plagas representan uno de los poductos finales del Proyecto MIP, en las que se resumen los resultados de las investigacione en fitoproteccion y manejo del cultivo, llevadas a cabo en Centroamerica y Panama en los cultivos de chile, maiz, repollo y tomate. Al poner a disposicion de las instituciones nacionales estas...

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