Mystery plant with supersonic hyper growth

GreenFinger

Chillin' In The Garden
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My Apple seedlings have grown to about a foot tall but now are developing a leaf browning symptom.
Anyone know what the cause is?
On one of them I clipped off all the brown leaves and on the very top it started to sprout to three new leaves but these also now after having grown in size start browning.
Most of the browning appears to be occurring from the outside in although some starts in between the veins of the leaf.
Spraying them with Natria Neem Oil and/or Garden Insect Killer seems to have little to no effect.
The phenomenon does not affect my little citrus plants (lemon, grapefruit, orange) but the oldest one, the lemon plant had a couple of leaves browning/drying at the tip, eventually falling off.
 

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