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This is an example of damage/burn/phytotoxicity on the foliage of Cannabis plants. This was caused by a copper based fungicide, which is something copper is prone to doing if you use high enough rates. We go over what the symptoms look like, and how to distinguish it from nutritional problems. Leaf burn from sprays can occur with a wide variety of different products (not just copper or fungicides), so you want to know the symptoms. Always test out new products on a small number of plants before using on everything in case it turns out to cause damage. These are stock plants in vegetative photoperiod. Thanks for watching.