congresos y reuniones científicas
Semiochemicals in IPM of a wheat pest that cannot be managed with insecticides
D. K. WEAVER; BUTELER, M.; M. L. HOFLAND; OSCAR GERARDO PEREZ; TALBERT LUTHER
Congreso; VIII congreso Argentino de Entomologia; 2012
The wheat stem sawfly, Cephus cinctus Norton, is the major pest of wheat production in the Northern Great Plains of North America. The life cycle of this stem mining species prevents the effective use of insecticides, resulting in annual losses of $350 million US. Host plant resistance and endemic biological control have long been the key tools for management by wheat producers, yet excessive losses persist. A complex pheromone system, with males and females producing and responding to the same suite of compounds, has been studied to yield the ability to use a single component, 9-acetyloxynonanal as an effective lure. Oviposition choice is heritable and (Z)-3-hexenyl acetate and (Z)- and (E)-β-ocimene are commonly more abundant behaviorally active compounds in cultivars females preferentially infest. Parasitoids are also attracted to some of the host plant compounds that the pest uses. Considerable research has been conducted on using semiochemically informed trap cropping as a potential component of IPM. A particularly promising approach is to use a combination of antixenosis and antibiosis in a push-pull trap crop scenario. Recent attempts at crop diversification offer the opportunity to increase profitability and maintain successful trap cropping. A conceptual framework for incorporating pheromones, kairomones and attractants for natural enemies in semiochemical-based IPM is presented for areas where production is heavily impacted by wheat stem sawfly.