Abstract

CHAVES, Néstor Felipe  and  ARAYA, Carlos Manuel. Effect of crop rotation in the incidence of “amachamiento” (Aphelenchoides besseyi Christie) in common bean. Agron. Costarricense [online]. 2012, vol.36, n.2, pp.61-70. ISSN 0377-9424.

The effect of crop rotation on the incidence of common bean “amachamiento” was evaluated in the “Brunca” region in Costa Rica during 2009 complemented by a field observation during 2010. The incidence of “amachamiento” in 2009 was quantified in vegetative (V3 or V4), flowering (R6) and pod-production (R8) plant growth stages, in bean commercial fields rotating with previous rice, corn, hot-pepper, pumpkin or bean. Four micro-plots (10 m²) were established in each field; to score “amachamiento” incidence, data were subjected to angular transformation and statistical means among treatments were separated by ANOVA. The 2010 field observation was developed in a farm growing common beans on soils previously planted with either ginger, taro or corn. In 2009, during the R8 growth stage a minimum incidence was detected in the hotpepper- bean rotation (4%), intermediate levels in the pumpkin-bean (15%) and rice-bean rotation (29%), and high incidence in both bean-bean (62%) and corn-bean (64%) rotations. In the 2010 field observations, during the flowering stage “amachamiento” incidence was 4% in the ginger-bean rotation and 5% in the taro-bean one, significantly lower than in the corn-bean rotation (25%). Based on these results, crop rotations such as hot-pepper, ginger, taro or pumpkin preceding common bean can reduce both “amachamiento” incidence and, consequently, yield losses.

Keywords : Amachamiento; crop rotation; Aphelenchoides besseyi Christie; Phaseolus vulgaris L; disease management; foliar nematode.

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