Leaf Damage Diagnosis

[ohiobruce]

The picture of the detached leaf is from one of my classroom figs. The other 13 look great.

The other two pictures are from large cuttings that I put in a tree pot. They are much taller than the rest on the shelf, and only about 6 inches from the light. Also, last week I accidentally left the light on all night. I'm guessing that this is burn from too much light.?

All three of these have been on the same shelf in the utility room and stay around 70F (21C for TorontoJoe).

 

[ohiobruce]

.

 

[GoodFriendMike]

Is the medium dry? If so that could cause it. I don't see webbing. So I don't think mites.

 

[RedSkip]

Potassium deficiency?

 

[ktrain]

Are you fertilizing them?
Almost looks like fert. burn.

 

[ohiobruce]

Is the medium dry? If so that could cause it. I don't see webbing. So I don't think mites.

Are you fertilizing them?
Almost looks like fert. burn.

I've been giving it water about once a week.
The last time I used a 1/4 teaspoon per gallon of Miracle Grow 18-18-21.

Their shelf mates don't show any stress. The only difference is the distance to the light. Then again, the other variable is that these are 1" dia. cuttings.

 

[GoodFriendMike]

Beside the three you posted earlier. They all look very healthy.

 

[ktrain]

All I can say is, some have more advanced roots than others, if they all get the same fert....and some show these signs it's possible they couldn't handle the fert.
I use a fertilizer that does not cause burn.
I realize you diluted it, probably more than I would have. lol
Really that's all I can figure, maybe go a little easier on those.