Happened to my chinkapin oaks. Haven't noticed it on the DCO's.
Could be too much water.
Sent from my iPad using Tapatalk
Could be a nutrient issue or could just be some environmental (wind or heat stress)
Did you ever figure out what caused it?
Sent from my iPhone using Tapatalk
Chlorosis will turn the leavesa light yellow and the veins will stay dark green.
It’s not frost damage? I had some pear trees that tips turned brown after a light frost about a month ago
Osmocote wouldn't do that. It releases very slowly and even at a high rate would not tip burn. Try poking some holes in the soil to see if drying it out a little helps. I've lost a chestnut and a post oak due to too much watering and then unexpected rains right after. One came back from the root after I quit watering it. Also I had probably 2-3 " of mulch on them for winter so I pulled most of that off and it's doing fine.I hope not! I just threw some Osmocote fertilizer (the only fertilizer had on hand) and watered it in real good.
Now we have a 60% chance of rain the next two days. Lol
Sent from my iPhone using Tapatalk