DIVERSIDAD DE FULGOROMORPHA (INSECTA-HEMIPTERA) Y FLUCTUACIONES POBLACIONALES DE ESPECIES VECTORAS ASOCIADAS CON EL AGROSISTEMA MAÍZ EN TRES AREAS AGROLÓGICAS DEL NOA.

ANA M. MARINO DE REMES LENICOV; A. MACIA; MARIANI, R; A. FOIERI; BRENTASSI, ME; A. TOLEDO; M.F.ROSSI BATIZ; PARADELL, S

Rosario

Congreso; MAIZ HD - X CONGRESO NACIONAL DE MAIZ; 2014

AIANBA Asociación de Ingenieros Agrónomos de la provincia de Buenos Aires

The high incidence of MRCV, a widespread endemic maize disease in Argentina, is linked to the presence and abundance of its vectors, but the relationship between them is poorly known. The diverse agricultural and ecological conditions prevailing in the Argentine maize area and the scarce knowledge about how these factors relate to the uneven dispersion of vectors and infections, prompted studies in areas with different agrological characteristics. A field survey of the communities of planthoppers in Tucumán province was carried out during 2009-2012. The aim of this study was to describe richness, abundance and seasonality of delphacids associated to maize crops and weeds. 20 species of Fulgoromorpha were collected and identified, one species in each Derbidae, Meenoplidae and Cixiidae families, and 17 species of Delphacidae. All 17 species of Delphacidae were present in ChSH (warm humid region), 3 in VI (intermountain valley) and 4 in ChSS (warm dry region). The abundance of species varied amongst habitats, being Toya propinqua the most abundant. In all three areas, the vectors Pyrophagus tigrinus and T. propinqua showed the highest degree of association with maize (49 % and 44 % respectively) followed by Chionomus haywardi (6%). On weeds, T. propinqua and T. nigra prevailed. The remaining 13 species were only occasionally collected. The continuous presence throughout the year of macropterous wingmorphs in populations of vectors indicated that maize cultivated areas can be readily colonized from wild vegetation, which behave as a reservoir of species during winter and also may harbor natural enemies.