Falling cause leaf drop?

[lauraeli]

Plant got knocked over (onto the ground, out of the pot) and dropped two leaves. A week later it got knocked over again. I potted it back up and moved it under the grow light. Next day a healthy leaf started to yellow and it is looking like it will drop that one now too.

This one is not healthy. It has only one short root after the two new roots failed to adjust to being buried in the growing medium.

But it has no rot, so why does it continue to decline? Why would it choose to drop a healthy leaf, when it had only two? The leaf was not damaged, nor was it dehydrated.

[Tschimm]

Was it under the lights before?

[lauraeli]

Originally Posted by Tschimm

Was it under the lights before?

No it wasnt but i have others there with no problem. In fact the ones under the grow light are the fastest growing of my phals.

[tarev]

Looks like it is succumbing to some type of rot, maybe collar rot.

[lauraeli]

Originally Posted by tarev

Looks like it is succumbing to some type of rot, maybe collar rot.

It does appear that way but there is no sign of rot. Crown and collar is firm and dry.

[Bill U.]

Was there any damage to the crown? Is the yellowing leaf separated from the crown in any way? It's odd to see the yellowing coming from the collar extending outwards. Normally when a phal is going to drop a leaf due to senescence (just getting old), it will reabsorb the nutrients from the tip of the leaf and work its way towards the crown... This has me a little stumped.

[lauraeli]

Originally Posted by Bill U.

Was there any damage to the crown? Is the yellowing leaf separated from the crown in any way? It's odd to see the yellowing coming from the collar extending outwards. Normally when a phal is going to drop a leaf due to senescence (just getting old), it will reabsorb the nutrients from the tip of the leaf and work its way towards the crown... This has me a little stumped.

It started from the middle of the leaf initially before it reached the crown Here is the first one i took so you can get a better idea.

There is no damage where the leaf attaches to the crown.

[lauraeli]

I have considered that the higher light from the grow light might have caused chlorosis, if the phal is nutrient deficient. That can happen in other plants. But then why would the new leaf be fine?

The yellowing did start on the highest point of the leaf nearest the light. But the newer leaf is obviously even higher and is fine.

[Leafmite]

I had this happen with my Phal stuartiana. It suffered a bit when I put it under lights even though my other Phals, even one that 'takes full shade,' were just fine. The new leaf looks perfect but the other leaves have lighter patches now. The damage has stopped, thankfully, but it isn't going to look very pretty for a while. I was told that I should have given my orchids and adjustment period but I just took them inside and threw them under the lights...I am growing under lights for the first time.

[lauraeli]

I just went in there to look at it, and it has dropped the leaf. Well at least it takes up less room...two inches of leaf and one inch of root.