Perspectives on management of fall armyworm, Spodoptera frugiperda (J.E. Smith) in the Philippines
2019
Parimi, S.
Corn production in the Philippines is affected by biotic and abiotic factors. Biotic factors include weeds, diseases like stalk rot, insect pests like aphids and lepidopterans viz., Asian corn borer Ostrinia funacalis (Guenee), corn earworm Helicoverpa armigera (Hubner), and common cutworm Spodoptera litura (Fabricius). In recent months, an invasive polyphagous species, the fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith), attacked corn in parts of Asia. It also feeds on other crops like sorghum, pearl millet, sugarcane, and cotton. Hitherto, it has been reported from 15 other Asian countries. Chemicals belonging to five or more modes for action (MoA) and Bt corn hybrids are being registered or given conditional approval for management of the pest. However, Bt corn in the Philippines is facing several challenges that may limit sustainability which include poor or no refuge compliance, use of single gene-based technologies, delay in shift to pyramided products during the long years of use leading to potential resistance and cross resistance issues. The use of Bt corn against FAW needs 'Functionally effective pyramided products with two or more genes of different MoAs' deployed in a seed blend (RIB refuge in a bag) model. One Bt corn hybrid, MON89034, has proven efficacy against FAW globally, likewise demonstrated in Vietnam. Bayer's corn hybrids DK6919S and DK9955S, and other crop protection products offer dual or different MoAs against FAW offering flexibility and benefit to farmers, following resistance management guidelines fitting into IPM plans.
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