Question: query regarding foot rot and leaf rot of betel vine. 
Answer: --please uproot the plant which become rot completely and drench the soil with 2% bordeau mixture or trichoderma viridi 5ml/liter or 5gram/liter of water, kept the soil for dry. also spray  2% bordeau mixture or trichoderma viridi 5ml/liter or 5gram/liter of water on the disease afected plant parts 3 times at 3 days interval in the evening time in the absence of rainfall. avoid water logging condition near the root zone.