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My oak sapling was doing well all summer, until a few weeks ago. It has these leaves that turn white. I removed one branch with white leaves already but it still seems to 'spread'. Anyone know what it is? Is it lethal or harmless? Oak

benn
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That’s because the leaves have ammonium nitrate due to high carbon concentration in air. How good is your ventilation ?

Rabid duxk
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    Welcome. I haven't heard of this, do you have a citation/reference for it – Rohit Gupta May 10 '23 at 13:40
  • Sounds like bogus, carbon has nothing to do with ammonium nitrate. And concentration of carbon? Do you mean that black powder?? The plant is outside, ventilation all over... – benn May 31 '23 at 19:31