Need help identifying diseased foliage (forum)

DrewG starts with ...
Hi.
Wondering if anyone is able to identify what's wrong with my coffee plant and acai palm.
The leaves are browning, but unlike sunburn it's starts at the tips and eventually consumes the whole leaf.

Additionally, is there anything I can do to save them?
I have 2 other coffee plants and 1 more acai palm.
These have mild symptoms, but are nowhere near the same damage as pictured.

Any help appreciated.

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Time: 28th August 2010 7:48pm

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About the Author DrewG
ACT
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amanda says...
Hi DrewG, have you had a dish under these plants?

Time: 28th August 2010 10:59pm

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About the Author amanda19
Geraldton. WA
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DrewG says...
Hi Amanda, and thanks for replying.

Yes, as they are inside, I have the pots sitting in a large shallow plastic tray.
(picture attached)

I check them twice weekly with a moisture meter, and water them lightly until I see the first water trickle from the bottom of the pots.

Apart from the mL of water that escapes during watering, the pots aren't standing in water though.

Could this be due to overwatering?
Are the plants salvable?


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Time: 29th August 2010 9:16am

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About the Author DrewG
ACT
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amanda says...
Hi DrewG, it might be better for the plants if you take them outside and give them a good flush (no dish!) until water running freely from the bottom.

Once they have drained then bring them back inside. Do this as much as you can when u water.

The leaves are indicating (to me) a build up of fertiliser salts in the potting mix.

Liquid fertiliser is better for pot plants, seasol very good. Water, then fertilise very lightly (less and often better in this situation)

If all else fails you may have to repot them in fresh mix.

I don't know anything about those two actual plants - in that I am not sure how long you will be able to keep them inside. Do u plan on planting them out sometime? How long have they been inside now?


Time: 29th August 2010 11:20am

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About the Author amanda19
Geraldton. WA
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Steven says...
Hi Drew how are you.

I agree with Amanda. Coffee trees like quite alot of water so it would be a better idea to flood them with water a few times a week and let the water drain through.

I would recommend fertilizing them with chicken pellets or something similar and giving them seasol once a week. once the weather warms up they should pick up and remember that during winter the will usually not do much or even die back a bit.

Regards

Steven

Time: 30th August 2010 10:44am

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About the Author Steven
Eastern Melbourne
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DrewG says...
Thanks amanda and Steven.
They've been inside since I bought them (about 8 months ago). My hops outside had 2-spotted mite and I didn't want these plants to catch those.

Now that the weather's warming up I can pop them outside.

I've been feeding them every second week with diluted fertiliser from my worm farm.

I'll try your suggestions of flushing them twice weekly and using seasol instead, and see how they go over the next several weeks. I'll also repot one of them to see if that picks up any faster.

Many thanks once again for your feedback.

regards
Drew

Time: 1st September 2010 8:10pm

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About the Author DrewG
ACT
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Steven says...
Thants ok, let us know how they go.

Coffee trees need good quality fertile free draining soil. so i would probably stay away from potting mix etc. it might be a good idea to repot them with top soil and some worm castings.

Regards

Stevn

Time: 1st September 2010 11:05pm

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About the Author Steven
Eastern Melbourne
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