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Le Criquet du Mato Grosso. Bilan et perspectives de 4 années de recherches : 1992-1996. Rapport final du projet « Environnement et criquets ravageurs au Brésil ».
This book "O gafanhoto do Mato Grosso" is available in portuguese at : https://www.embrapa.br/busca-de-publicacoes/-/publicacao/16721/o-gafanhoto-do-mato-grosso-balanco-e-perspectivas-de-4-anos-de-pesquisas-1992-1996 Studies conducted within the framework of the EMBRAPANMA/EC/CIRAD-GERDAT-PRIFAS project, entitled "Environment and Pest Locusts and Grasshoppers of Brazil", have focused on Rhammatocerus schistocercoides (Rehn, 1906). This is an important pest grasshopper of Mato Grosso state (Brazil) where outbreaks were, until present, explained as being a consequence of deforestation and accelerated agricultural development that has occurred since the early 1980s. Many results obtained in this project refute previous hypotheses, especially concerning the assumption that grasshopper outbreaks are a recent phenomenon in Mato Grosso, that agricultural development has had an important impact on the grasshopper situation, and that these grasshoppers are a potential threat to neighbouring states. Some of the main results obtained in this project are: - The evidence that R. schistocercordes outbreaks are a long-standing phenomenon in Mato Grosso; they are in no way a new phenomenon prompted by the recent agricultural development in this region. - The understanding of the relationships between land use (agricultural, pastoral and traditional) and grasshopper outbreaks. - The findings concerning factors that determine grasshopper outbreaks, which seem to be mainly associated with the rainfall regime, especially from August to October, a critical period for the grasshopper cycle. - The clarification of many points concerning the biology and ecology of this grasshopper; especially the finding that swarm movements are much more limited than previously assumed; considerable data has been collected on imaginal diapause, sexual maturation, development times for various biological stages, the number of instar stages, the absence of phasal polymorphism, etc. - The mapping of grasshopper biotopes (breeding biotopes and dry season refuge biotopes), essential for understanding the consequences of agricultural development in outbreak zones and basic documenls required for organizing efficient grasshopper survey and control operations as part of a renovated control strategy. The results of this project will have a critical operational impact. Strategies to control Rhammatocerus schistocercoides should now be completely reconsidered, while promoting local preventive spot treatments. There is considerable research potential in continuation of the currenl project, i.e. to perfect grassnopper outbreak survey, early-detection (high temporal resolution satellites) and grasshopper control (mycopesticides) techniques. Overall, the results of this project have been the topic of twelve scientific publications, six confetence papers, fourteen maps (covering an area of about 145 000 km') and nineteen unpublished reports. Several publications are currently in preparation along with various other communications documents.