Synergistic interaction between the fungus Beauveria bassiana and desiccant dusts applied against poultry red mites (Dermanyssus gallinae)

摘要: The poultry red mite, Dermanyssus gallinae, is a major pest in egg production, feeding on laying hens. Widely used non-chemical control methods include desiccant dusts, although their persistence under field conditions often short. Entomopathogenic fungi may also hold potential for mite control, but these take several days to kill mites. Laboratory experiments were carried out study the efficacy of 3 types fungus Beauveria bassiana and combinations two agents against D. gallinae. There was significant synergistic interaction between each dusts fungus, with observed levels mortality significantly higher than those expected an additive effect (up 38 % higher). Synergistic dust found when different application at relative humidity. Although increased reached due interaction, speed lethal action not influenced by combining components. applied separately or combination did change over period 4 weeks. Overall, conidia seem considerable promise future