Parasitism of Megacopta cribraria (Hemiptera: Plataspidae) by Paratelenomus saccharalis (Hymenoptera: Platygastridae) in organic soybean plots in Georgia, USA
Keywords:
kudzu bug, conventional tillage, no-tillAbstract
Megacopta cribraria (F.) (Hemiptera: Plataspidae) is a newly invasive, exotic pest of soybean (Glycine max [L.] Merr.; Fabales: Fabaceae) in the southeastern United States. In 2013, the exotic egg parasitoid Paratelenomus saccharalis (Dodd) (Hymenoptera: Platygastridae) was discovered parasitizing eggs of this pest in kudzu (Pueraria montana var. lobata [Willd.] Maesen & S. Almeida; Fabales: Fabaceae) and soybean in 3 states in this region of the United States. We evaluated parasitism of M. cribraria egg masses by P. saccharalis in conventional tillage and no-till organic soybean experimental plots in 2013. Density of M. cribraria egg masses was significantly higher in conventional tillage soybean than in no-till soybean in weeks 2 through 5 for the 7 wk period M. cribraria egg masses were detected on soybean. Percentage of parasitism of M. cribraria egg masses by P. saccharalis was significantly higher in conventional tillage soybean (58.4%) than in no-till soybean (44.9%). In general, parasitism rates of egg masses were higher in conventional tillage soybean, where M. cribraria egg mass density was higher, than in no-till soybean.
Sumario
Megacopta cribraria (F.) (Hemiptera: Plataspidae) es una nueva plaga exótica invasiva de soja (Glycine max [L.] Merr .; Fabales: Fabaceae) en el sureste de los Estados Unidos. En el 2013, se descubrió un parasitoide exótico de los huevos, Paratelenomus saccharalis (Dodd) (Hymenoptera: Platygastridae), que parasita los huevos de esta plaga en el kudzu (Pueraria montana var. lobata [Willd.] Maesen y S. Almeida; Fabales:. Fabaceae) y soja en 3 estados en esta región de los Estados Unidos. En parcelas experimentales en 2013 se evaluó el parasitismo de masas de huevos de M.cribraria por P. saccharalis en soya de labranza convencional y de soja orgánica sin labranza. La densidad de masas de huevos de M. cribraria fue significativamente más alta en soja de labranza convencional que en la soja sin labranza en las semanas 2 a 5 del período de 7 semanas que se detectaron las masas de huevos de M. cribraria en la soja. El porcentaje de parasitismo de las masas de huevos de M. cribraria por P. saccharalis fue significativamente mayor en la labranza de soja convencional (58,4%) que en la no-labranza de soja (44,9%). En general, la tasa de parasitismo de las masas de huevos fue mayor en soja de labranza convencional, donde la densidad de masas de huevos de M. cribraria fue mayor, que en la soya sin-labranza.
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