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Experiments were conducted to examine the biological effects of Kava, a perennial pepper plant native to oceanic region on paddy weeds and fungi harmful to plants and crops. Kava showed a strong inhibition on growth of barnyardgrass (Echinochloa crus-galli), monochoria (Monochoria vaginalis), and knotgrass (Paspalum distichum L.), which are among the most harmful paddy weeds. Kava completely controlled...