Sulfur / Oil Spray Leaf Burn - What Happens now?

everythingirl1April 19, 2009

Last fall my pole beans got rust and powd. mildew. So I sprayed with organocide oil spray at 6 AM. The leaves developed leaf burn. So with my spring garden I vowed not to let that happen. I asked my local nursery expert and he recommended that I spray oils in the evening and then wash off early the next AM and that way avoid burns. I did that and so far, no leaf burn.

Two weeks ago, my curcurbits (crookneck, butternut, cucumber, pumpkin), peach tree, and beans all started to develop various fungus, rusts, etc. So I decided to do an overall anti-fungus spray (the peach tree needed the sulfur spray) so rather than waste the leftover sulfur, I sprayed the squash, beans, and peach tree with sulfur. I also went ahead and sprayed some of the tomatoes. I figured since the sulfur was not an oil spray, it would be fine.

I sprayed with Bonide Sulfur Spray at 7 PM on a tuesday. On weds. morning I washed it off with water. On thursday afternoon, I noticed that the plants had bronzed leaves and curled tips. They have leaf burn!!! UGH!!!!

By Saturday they looked very sorry indeed.

So, what do I do to avoid this? Is it unavoidable? Any way to minimize the damage? After they are damaged, will they come back?

There is nothing worse to raise these little plants and then realize that you caused all of this damage to them.......

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jean001(z8aPortland, OR)

1. To avoid:
Read the label to determine if the spray is appropriate for the plants and, if so, also make certain the dose also appropriate. Then follow label directions.

2. Is it unavoidable?
No. See #1 above.

3. Any way to minimize the damage?
What's done is done.

4. After they are damaged, will they come back?
No. Dry brown tissue is dead. Nothing will fix that. If it will make it feel better, trim off the brown but keep all the green. (The Catch-22 with doing that is more tissue will brown. If it were mine, I'd leave it be.)

As it turns out, gardening is a series of live-and-learn lessons.

Now that you have this experience, learn from it then forge ahead. You have plenty of time to start over with new seedlings.

Have fun in your garden.

    Bookmark   April 19, 2009 at 1:32PM
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digdirt2(6b-7a No.Cent. AR HZ8 Sun-35)

You don't indicate the dosage strength you used nor how heavily you applied it. Personally I have never had a problem with plain Bonide Sulphur Spray when following the label directions for proper mixing and "light" spraying (you aren't supposed to drench the plants).

But I have had problems with their Oil & Lime Sulphur spray product if used at full strength - because of the oil - so if needed (we have cedar rust problems) use at 1/2 strength.

Can't do much for your current problem - some may recover, some won't. But for future reference, use only on the recommended plants and only at the strength for that specific plant. There is no one mixture suits all recipe. And lightly mist the plants, don't drench them. Apply in late evening after the sun sets and rinse off before the sun hits the plants in the early AM.


    Bookmark   April 19, 2009 at 3:13PM
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