Bugs, Mildews, Strange Stuff forum: White Stuff On My Hoya 'Lacunosa"

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Views: 44, Replies: 9 » Jump to the end
lindaboom
Jul 2, 2012 5:51 PM CST
Name: Linda Cannon
New Harmony, UT - Zone 5
My Lacunosa has white spots on alot of the leaves. I can scratch it
off with my fingernail. What is it and how do I get rid of it?

Thumb of 2012-07-02/lindaboom/eeaf97
Thumb of 2012-07-02/lindaboom/f3b809
AlohaHoya
Jul 2, 2012 8:28 PM CST
Name: Carol Noel
Hawaii (near Hilo)
It's all about choices.
Is it like a calcium deposit from the water there? Is it scabby?
Leap. The net will appear.
lindaboom
Jul 3, 2012 9:02 AM CST
Name: Linda Cannon
New Harmony, UT - Zone 5
Hi Carol,

I did daily misting during the early spring until the weather warmed
up enough to turn on the swamp cooler. The water that I used to
mist the plants was softened with potassium chloride. Thats the
only thing I can think of that may have caused the spotting. I fertilize
with Dyna-Gro Grow (7-9-5) at 1/4 tsp/gallon each time I water. The
lacunosa seems to show white spots more than my other hoyas.

Linda
lindaboom
Jul 3, 2012 9:05 AM CST
Name: Linda Cannon
New Harmony, UT - Zone 5
Also I can rub off the spots with my fingernail but it doesn't really
feel scabby and it doesn't come off easily. Hope I'm making sense.

Linda
AlohaHoya
Jul 3, 2012 10:57 AM CST
Name: Carol Noel
Hawaii (near Hilo)
It's all about choices.
Unless the 'damage' affects the whole leaf tissue, I am going to guess that the spots are deposits from the salts in the water. Potassium chloride? Are you sure it isn't Sodium Chloride?

My husband, a chemical engineer, says to taste them...if they are salty.

I would NOT use any oil or milk or any other 'trick' people use...clogs up the 'pores' on the leaves ....
Leap. The net will appear.
plumania
Jul 3, 2012 12:24 PM CST
Name: Alka
South Florida
Could be from too much salt. If you have potassium in the water softner and then fertilize on each watering, that would add more potassium (the K in NPK). I would say, flush the plants well with water (without softner?) and do not add any fertilizer for next few waterings.
That should get rid of excessive salt.
My neighbour was using water softening tablets or granules and then he would drain the whole tank periodically between our boundary line. I have an Ylang Ylang tree about 6-7 feet from that boundary line and every time he flushed his water tank(placed on side of the house), my tree lost at least 50% of leaves and many small plants on boundary line died. His side of grass had dead grass trail leading upto my side of boundary and that is how I knew it was his tank that hurt my plants.
Eventually I asked his wife to stop flushing his water tank on our side and also gave the reason. She said she was only putting 'recommended amount' in the water tank.
Anyway, she stopped draining this stuff and my tree and plants had no more issues.
[Last edited Jul 3, 2012 12:27 PM CST]
Quote | Post #887711 (6)
AlohaHoya
Jul 3, 2012 1:37 PM CST
Name: Carol Noel
Hawaii (near Hilo)
It's all about choices.
IF you can rub the spots off, it is from the water landing on the leaves, not the water it is taking up.

Salts can be devastating....
Leap. The net will appear.
lindaboom
Jul 3, 2012 3:49 PM CST
Name: Linda Cannon
New Harmony, UT - Zone 5
Alka - I think a flush is a good idea. I'll also hold off on the fertilizer
for awhile.

Carol - I agree with you that its probably from the misting...and I'm
sure its potassium chloride at $25/bag Grumbling In the future I'll
mist with only non-softened water.

Thanks for the great advice,
Linda
AlohaHoya
Jul 3, 2012 4:12 PM CST
Name: Carol Noel
Hawaii (near Hilo)
It's all about choices.
Suggestion: get some pH strips and take a reading of your 1) soil, 2) water. Usually hard water has a lot of calcium in it (and is very high pH)...adding Epsom Salts to it will balance it...but you need to play with proportions of Epsom Salts to the Water. Also, let your water sit out, in an open container, for about 24 hours before you use it so the chemicals will flash off..... knowing the pH of your soil and water might help a lot.
Leap. The net will appear.
lindaboom
Jul 4, 2012 10:43 AM CST
Name: Linda Cannon
New Harmony, UT - Zone 5
Thanks Carol.....I'll do that. I agree

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