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Economic Impact of Cotesia flavipes (Cameron) (Hymenoptera: Braconidae) for Controlling Sugarcane Moth Borers in Thailand

Maneerat, Tewee, Uraichuen, Sopon, Suasa-ard, Wiwat
Sugar tech 2017 v.19 no.6 pp. 616-622
Chilo infuscatellus, Chilo sacchariphagus, Cotesia flavipes, Scirpophaga, Sesamia inferens, adults, biological control, cost benefit analysis, economic impact, endoparasitoids, farmers, field experimentation, income, larvae, moths, sugarcane, Thailand
Sugarcane moth borer pests in Thailand include the crambids Chilo infuscatellus Snellen, Chilo sacchariphagus (Bojer), Chilo tumidicostalis (Hampson) and Scirpophaga excerptalis (Walker) and the noctuid Sesamia inferens (Walker). The economic impact of the larval endoparasitoid, Cotesia flavipes (Cameron) (Hymenoptera: Braconidae) was studied through field experiments and benefit–cost analysis. Augmentative biological control research was conducted over two consecutive cropping seasons (2009–2011) to compare yields and net income of sugarcane between plots where C. flavipes was released every month (1250 adults/ha) and plots without releases. In treated plots, significantly (P < 0.05) higher yields were obtained: 84.38 ± 5.21 t/ha in the 2009/2010 and 86.47 ± 7.07 t/ha in the 2010/2011 cropping seasons, compared to control plots; 66.45 ± 7.62 t/ha in the 2009/2010 and 67.60 ± 4.79 t/ha in the 2010/1011 cropping seasons, respectively. Net income of the farmer from treated areas of USD 1637.78/ha in the 2009/2010 and USD 1340/ha in the 2010/2011 cropping seasons were significantly (P < 0.05) higher than those in the untreated areas: USD 532.37/ha in 2009/2010 and USD 322.61/ha in 2010/2011 cropping seasons.