Spray the leaves with high concentration of urea/nitrogen (fertilizer) on a sunny day. Nitrogen will burn it( but not like fire). Make sure that when you spray, it will be totally wet. Use powerspray for big trees. If the leaves will not show a sign of withering and burns after a week then add more urea/nitrogen to your next spray (be patient or use 50 kilos of urea per tree if your not that patient. UREA IS NOT TOXIC TO THE ENVIRONMENT (uhum, I HOPE).
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