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Purpose: The Farmer Field School (FFS) has been used to enable farmers to adapt their farming decisions according to the field situation. This paper explores the methodological state, challenges and lessons learned, of the FFS around the World. Design/methodology/approach: We used a 52-item questionnaire to capture issues of design, implementation and evaluation of the FFS. Completed questionnaires were received from 57 ongoing or recent FFS programmes. Data were analysed using descriptive statistics. Findings: FFS programmes have diversified, including multiple crops and livestock. Farmer involvement in the design and planning of interventions was found to be critical. FFS programmes increasingly relied on farmers as FFS facilitators. Short training duration for FFS facilitators raised concern about FFS quality. Even though mechanisms for monitoring and evaluation were mostly in place, capacity for data analysis and data utilization were a concern. Practical implications: Results highlight strengths and shortcomings in design, implementation and evaluation of the FFS. The information acquired can be used to support the quality of ongoing and future programmes. Theoretical implications: This research contributed to understanding that the educational foundations of the FFS should be reflected in programme design and evaluation. Originality/value: Many studies of the FFS exist, but this is the first global overview on how farmer field school programmes are carried out, with various lessons learned.

In Africa, Typhiodromalus manihoti and T. aripo, two introduced predators of the cassava green mite Mononychellus tanajoa, occupy different parts of cassava foliage. In the present study, niche use by these two predators, as mediated by prey-induced info chemicals, was investigated. In response to prey feeding damage, cassava plant parts emit volatile blends, that attract phytoseiidae predators. When given a choice between old cassava leaves infested with M. tanajoa and either apices or young cassava leaves infested with M. tanajoa, T. aripo displayed a marked preference for odors emitted from either infested apices or infested young leaves over infested old leaves but showed no preference for odors from apices versus young leaves, all infested with M. tanajoa. Typhlodromalus manihoti did not discriminate between volatiles from the three infested cassava plant parts. Our data show that T. aripo uses differences in volatile blends released by infested cassava plant parts and restricts its fundamental niche to a realized niche, which enables coexistence with its competitor T. manihoti. [ABSTRACT FROM AUTHOR]

Focuses on Typhlodromalus manihoti and Typhlodromalus aripo, which are predators of the cassava green mite Mononychellus tanajoa in Africa. How Oligonychus ossypii and Tetranychus urticae also occur in the cassava agroecosystem; Role of Y-tube olfactometer to determine the attraction of the predators to odors from O. gossypii- or T. urticae-infested cassava leaves; Reactions of T. aripo but not T. manihoti to odors from O. gossypii-infested leaves; Discussion of ecological advantages and disadvantages of the predators' behavior and possible implications for biological control of M. tanajoa.