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Options for Managing Antestiopsis thunbergii (Hemiptera: Pentatomidae) and the Relationship of Bug Density to the Occurrence of Potato Taste Defect in Coffee

Authors: Bigirimana, Joseph; Gerard, Andrew; Mota-Sanchez, David; Gut, Larry J.;

Options for Managing Antestiopsis thunbergii (Hemiptera: Pentatomidae) and the Relationship of Bug Density to the Occurrence of Potato Taste Defect in Coffee

Abstract

Potato taste defect is a potato-like smell found in green and roasted coffee beans. Potato taste defect reduces the flavor experience of finished coffee and causes it to be rejected by consumers. The presence of potato taste defect has been associated with insect damage, especially damage from the Antestia bug, Antestiopsis thunbergii (Gremlin) (Hemiptera: Pentatomidae). A 2-yr study was conducted to evaluate the effectiveness of integrated pest management using pruning alone or in combination with several commercially available insecticides to control a field population of Antestia bug and to assess the relationship between these treatments and the occurrence of potato taste defect in coffee using laboratory and field tests. Field trials were conducted in 3 major coffee growing regions of Rwanda: Rubona, Gakenke, and Kirehe. In laboratory bioassays, significant differences were found between insecticides on the percentage mortality of adult bugs. The percent mortality was higher for pyrethroid, Fastac (Alpha-cypermethrin), and pyrethrins (Pyrethrum 5EW, Pyrethrum EWC + Sesame and Agroblaster) than for the neonicotinoid, imidacloprid. Mortality from imidacloprid increased over time, providing a lower mortality than Pyrethrum 5EW and Agroblaster 12 h post-treatment. In the field, the highest mean mortality was achieved with Pyrethrum 5EW, Fastac, and Pyrethrum EWC applied to pruned coffee trees. Additionally, pruning alone registered a statistically higher mean insect mortality than unpruned coffee trees without insecticides application. Multiple logistic regression analysis indicated that potato taste defect was positively associated with the bug density and the extent of damage caused by Antestia bug. The study suggests that pruning combined with insecticide application, especially Fastac, provides better control of Antestia bug and significantly reduces potato taste defect compared to either pruning or insecticide application alone. Resumen El defecto del sabor de la papa es un olor similar a la papa que se encuentra en los granos de cafe tostados y verdes. El defecto del sabor de la papa reduce la calidad del sabor del cafe procesado y hace que los consumidores lo rechacen. La presencia de del sabor de la papa se ha asociado con dano por insectos, especialmente dano por el chinche Antestia, Antestiopsis thunbergii (Gremlin) (Hemiptera: Pentatomidae). Se realizo un estudio de dos anos para evaluar la efectividad del manejo integrado de plagas usando solamente la poda o en combinacion con varios insecticidas disponibles comercialmente contra una poblacion del chinche Antestia en el campo y para evaluar la relacion entre estos tratamientos y la ocurrencia de del sabor de la papa en el cafe usando el laboratorio y pruebas de campo. Se realizaron ensayos de campo en tres de las principales regiones productoras de cafe de Ruanda: Rubona, Gakenke, y Kirehe. En bioensayos de laboratorio, se encontraron diferencias significativas entre los insecticidas en el porcentaje de mortalidad de insectos adultos. El porcentaje de mortalidad fue mayor para los piretroides, Fastac (alfa-cipermetrina) y las piretrinas (Pyrethrum 5EW, Pyrethrum EWC + Sesame y Agroblaster) que para el neonicotinoide, imidacloprid. La mortalidad por imidacloprid aumento con el tiempo, proporcionando una mortalidad menor que Pyrethrum 5EW y Agroblaster 12 horas despues del tratamiento. En el campo, el promedio mas alto de mortalidad se logro con Pyrethrum 5EW, Fastac y Pyrethrum EWC aplicado a los cafetos podados. Ademas, la poda sola registro un promedio de mortalidad de insectos estadisticamente mas alta que los arboles de cafe no podados sin aplicacion de insecticidas. El analisis de regresion logistica multiple indico que del sabor de la papa se asocio positivamente con la densidad de los chinches y la magnitud del dano causado por Antestia. El estudio sugiere que la poda combinada con la aplicacion de insecticidas, especialmente Fastac, proporciona un mejor control del chinche Antestia y reduce significativamente la del sabor de la papa en comparacion con solamente la poda o la aplicacion de insecticida. View this article in BioOne

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
12
Top 10%
Average
Top 10%
Green
gold
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