Lutte biologique

La fusariose vasculaire du cyclamen est une maladie causee par le champignon tellurique Fusarium oxysporum f. sp. cyclaminis. Elle est consideree comme l’une des maladies les plus graves du cyclamen et se traduit par des pertes atteignant jusqu’a 50 % de la production. Actuellement, les moyens de lutte ne permettent pas de controler la maladie. Dans ce contexte, une collaboration s’est engagee entre l’institut technique de l’horticulture, Astredhor, representant les producteurs, l’INRA de Dijon pour son expertise sur F. oxysporum et la societe Agrene pour son expertise en lutte biologique. Les objectifs de cette collaboration etaient doubles : i) identifier un marqueur specifique de la forme speciale cyclaminis et developper un outil de detection de l’agent pathogene permettant de mettre en place des methodes de lutte appropriees ; ii) identifier un agent de lutte biologique efficace contre le pathogene. Le travail s’est donc structure autour de ces deux objectifs.Une collection de ...

This study was conducted to analyse spatio-temporal dynamics and the impact of rainfall and temperature on two beneficial insect-families in cotton farms in Côte d'Ivoire, Formicidae and Coccinellidae. They contribute to reduce the pest populations in the cotton farms. Data were collected in four localities treated with chemical vulgarized. Sampling, of rainfall and temperature data were collected respectively by direct counting, capture with mowing net, traps, rain gauges and thermo-hygro-meters installed. We have inventoried 7675 insects including 93% for the Formicidae and 7% for the Coccinellidae. Analysis of variance, showed that there is a significant difference in aboundance of Formicidae but there is no significant difference between the population of Coccinellidae. Rainfall and temperature have not affected the dynamics of beneficial insects populations. Knowledge of those beneficials insects is important to developt an integrated cotton pests control methods.