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Abstract
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Planthoppers are tiny brown-gray insects (0.1 - 0.4 cm long). Long-winged forms of brown planthoppers (BPH), Nilaparvata lugens (Stål), and white backed planthoppers (WBPH), Sogatella furcifera (Horvarth) develop when food is unavailable, or when they are crowded. Long-winged adults can disperse for hundreds of kilometers.
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