Farmers perceptions of the speargrass (Imperata cylindrica) problem and its control in the lowland subhumid savannah of Nigeria

Abstract

Speargrassseverely constraints crop production in the sub-humid lowlands of West Africa. Researchers have identified and demonstrated effectivemanagement techniques but the adoption rate among farmers is still low. Data were collected from 41 communities in Cross River, Kogi and BenueStates in Nigeria using rural rapid appraisal techniques. The objectives were to assess the importance of agriculture in the livelihoods of eachcommunity, identify priority crops, assess perceptions of the speargrass problem, identify existing speargrass control strategies and localinstitutions/farmers with the capacity to implement speargrass control trials. Crop production was the main source of livelihood for all households.The most important crops from the perspectives of both food security and cash sale were cassava and yam, and these were most affected by theweed. Speargrass was the major constraint to crop production because of lack of capital for hiring labour and purchasing inputs, declining soilfertility, bush burning, deforestation, continuous cropping and lack of required skills. Slashing, hand-pulling, burning, deep digging and fallowingwere the most common control methods used by farmers, but these were very labour intensive and ultimately not effective. Farmers assessedspeargrass control measures through labour and cash requirements, material availability, effectiveness, time span to achieve control and cropyields. They rated chemical control most highly. Longer fallow periods and re-afforestation were effective but impractical as pressure on landintensifies from population growth. From the results of this study, we conclude that the use of community-based participatory a pproaches is essential to identify various technologies for combating speargrass.