Bugs, Mildews, Strange Stuff forum: White Stuff On My Hoya 'Lacunosa"
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| 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?   |
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| Is it like a calcium deposit from the water there? Is it scabby? Leap. The net will appear. |
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| 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 |
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| 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 |
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| 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. |
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| 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. |
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| 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. |
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| 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  In the future I'llmist with only non-softened water. Thanks for the great advice, Linda |
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| 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. |
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Thanks Carol.....I'll do that.  |
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