This disease is caused by Xanthomonas compestris pv betlicola and occurs sporadically in certain pockets (Mathew et al. 1978) and in the vicinity of other Piper spp. (Bhale et al. 1984). The causal organism is Xanthomonas compestris. The symptoms appear as small water soaked lesions on the leaf lamina and margins which later become dark with a chlorotic halo and at time cause defoliation. Chloramphenicol at 200 ppm was reported to be effective in inhibiting the growth of the bacterium (Mathew et al. 1979). However, control measures to prevent this disease in the field are not available.
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