Potential of plastic barriers to control Andean potato weevil Premnotrypes suturicallus Kuschel

Kroschel, J.; Alcázar, Juan Francisco Jiménez; Poma, P.

doi:10.1016/j.cropro.2009.01.008

Cited by 22 publications

(16 citation statements)

References 4 publications

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“…Sometimes losses are even greater, especially when post-harvest losses are considered. Much harvested food is contaminated with mycotoxins, pesticides, and pathogens, making it unfit for human consumption (European Commission, 2005;Kroschel, Alcazar, & Poma, 2009). Therefore, access to agricultural extension services including sound plant health extension services is very important factor for increased productivity and thus accelerated agricultural growth and ultimately the food security.…”

Section: Introductionmentioning

confidence: 99%

SWOT analysis of plant health clinics as perceived by plant doctors in Nepal

Adhikari

Regmi

Thapa

et al. 2018

J. Inst. Agric. Anim. Sci.

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This paper identified and examined the internal and external forces that enable or inhibit the performance of plant clinics in Nepal. The study used web-based online survey tool to collect primary information. Likert scaling and indexing techniques were used on data analysis. Pretested set of questionnaires were mailed to 209 plant doctors and the response rate was 54.54%. Being ninth country to initiate plant health clinics, Nepal is successful to adapt this novel approach into the existing extension system. It has increased access to plant health services by providing wide range of services at a place. However,limited understanding and only profit motive of local private agro-vet and input dealers has created some biased-understanding and un-trust with clinic organizers. This SWOT analysis clearly spells the scope of plant clinics to fulfill the gap between farmers need and existing services provided by public extension system.Journal of the Institute of Agriculture and Animal Science.Vol. 33-34, 2015, page: 137-146

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Section: Introductionmentioning

confidence: 99%

SWOT analysis of plant health clinics as perceived by plant doctors in Nepal

Adhikari

Regmi

Thapa

et al. 2018

J. Inst. Agric. Anim. Sci.

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“…The occasionally found weevils in two‐first‐year fallow samples indicate that fallows are the least important as infestation sources. This also could be shown in the study by Kroschel et al. (2009) demonstrating that plastic barriers controlled effectively Andean potato weevils in potato fields planted after fallows in the village Ñuñunhuayo; instead, in 2nd‐year potato fields in Aymará, infestation levels were much higher as a cause of within field weevil sources from the previous year of potato cropping.…”

Section: Discussionmentioning

confidence: 57%

“…Management of first‐year potato fields is a key to lowering the densities of weevils in intensive potato cropping systems. Apart from direct control of weevils by either using insecticide applications or using plastic barriers (Kroschel et al. 2009), early‐maturing varieties could play an important role in reducing the weevil population of these fields by physically taking immature stages of the weevils out of the fields together with harvested tubers and thus lowering 2nd‐year potato fields weevil overwintering sources.…”

Section: Discussionmentioning

confidence: 99%

Evaluation and implications of Andean potato weevil infestation sources for its management in the Andean region

Rios

Kroschel

2011

Journal of Applied Entomology

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The Andean potato weevil Premnotrypes suturicallus Kuschel (Coleoptera: Curculionidae) is one of the most damaging potato (Solanum spp.) pests in the Andes. The objective of this study was to get a better understanding of weevil infestation sources and its distribution in potato fields as well as on the effect of potato cropping intensity and farmers’ harvest practices on weevil infestation to provide better clues for its management. For this purpose, a methodology was developed to assess weevil field densities in potato. A Taylor’s power law indicated that 177 and 69 samples are necessary to assess low (0.5 weevils/m2) and high (5 weevils/m2) weevil densities for a moderate reliability or precision level (D = 0.5). In potato fields, overwintering weevil densities were highest at field borders with 3.5 weevils/m2 at a distance of <2.5 m compared to 0.7 weevils/m2 at distances >10 m from the field border. No effects of time of harvest could be detected on soil overwintering weevil densities. The quantification of the larval density per potato plant after harvest showed that fields after 2‐year potato rotations had eight times more overwintering weevils compared to 1‐year rotations. Weevil infestation sources were mainly potato fields with the highest infestation (89%) followed by olluco (Ullucus tuberosus) and oat (Avena sativa) fields having volunteer potato plants (35%). The results confirm and support previous assumptions about the importance of the cropping systems for Andean potato weevil infestation and management. The confirmation that weevils do not occur or only in neglected numbers on fallow fields supports the use of plastic barriers to effectively exclude migrating flightless adult weevils to potato fields cultivated after fallow. The distribution of overwintering weevils indicates that farmers could concentrate efforts to control adult weevils mainly to the first meters of potato fields.

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“…el conocimiento de la disposición espacial del insecto y del patrón de colonización del cultivo, ofrece ventajas de índole práctica para el manejo de la plaga (Kroschel et al, 2009). Por ejemplo, en este estudio se encontró que en algunas zonas del área de experimentación se registraron niveles altos de daño por el gusano blanco, mientras que otras zonas permanecieron virtualmente libres de la plaga.…”

Section: Período Lote 1 Loteunclassified

Distribución espacial de Premnotrypes vorax (Hustache) (Coleoptera: Curculionidae) en cultivos de papa

Pérez-Álvarez

Argüelles-Cárdenas

Garramuño

2010

CTA

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La distribución espacial de los insectos plaga proporciona información importante para optimizar los programas de manejo y reducir la aplicación de insecticidas. En este trabajo se estudió la dinámica espacial de los adultos del gusano blanco Premnotrypes vorax en dos cultivos comerciales de papa durante 18 semanas. Durante este período se registró el número de adultos capturados semanalmente en 25 trampas de caída dispuestas en un diseño en cuadrícula. Además, se realizó la evaluación de los niveles de daño ocasionados por el insecto en tubérculos cosechados al final del ciclo de cultivo. Utilizando el método de análisis espacial mediante índices de distancia (Sadie), se determinaron: 1.- Los patrones y estabilidad temporal de la distribución espacial de los adultos, y 2.- La asociación espacial entre la distribución de los adultos y la distribución de la incidencia de daño en tubérculos. Los análisis sugieren una distribución agregada de los adultos en la mayoría de fechas evaluadas y una estructura espacial temporalmente estable. La asociación espacial entre el patrón de distribución de los adultos con la incidencia de daño en tubérculos fue significativa (p < 0,025). Estos resultados sugieren que es posible utilizar estrategias de control dirigidas hacia los focos específicos de infestación, para optimizar el manejo de la plaga y reducir la aplicación de insecticidas. Spatial distribution of Premnotrypes vorax (Hustache) (Coleoptera: Curculionidae) in potato crops.The spatial distribution of insect pest provides important information that can optimize the management programs and reduce insecticide applications. In this work, the spatial dynamics of the Andean weevil Premnotrypes vorax, were studied in two commercial potato crops for 18 weeks. During this period, the adult number was registered weekly in 25 pitfall traps, which were arranged in a quadrangular design. Moreover, the pest injury levels were evaluated in harvested tubers at the end of the crop cycle. Using the Spatial analysis by distance index (Sadie) method, were determined: (1) the patterns and temporal stability of the spatial distribution of adults and, (2) the spatial association between the distribution of adults and the distribution of damage incidence in tubers. The analyses suggested an aggregated pattern of adults in most of the evaluation dates and a temporally stable spatial structure. The spatial association between the distribution patterns of adults with the damage incidence in tubers was significant (p < 0.025). These results suggest that it is possible use spatially targeted control strategies to optimize the pest management and reduce insecticide applications.

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Potential of plastic barriers to control Andean potato weevil Premnotrypes suturicallus Kuschel

Cited by 22 publications

References 4 publications

SWOT analysis of plant health clinics as perceived by plant doctors in Nepal

SWOT analysis of plant health clinics as perceived by plant doctors in Nepal

Evaluation and implications of Andean potato weevil infestation sources for its management in the Andean region

Distribución espacial de Premnotrypes vorax (Hustache) (Coleoptera: Curculionidae) en cultivos de papa

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