Hi Toney, I already get news from your web site but my issue is leaves turning yellow and falling off with lots of weird looking spots all over so I am thinking it might be a fungus of some sort and I am not sure of how to get rid of this problem without killing the eggs. Mix equal parts 3% hydrogen peroxide and distilled water. Help! I was thrilled and spent as much time as I could watching and photographing them. Hi Kathryn, check out this info for how we use hydrogen peroxide. I wonder what the issue is. I’m in central Florida. Water at the base of the plants– this is less necessary if your plants have good air circulation. I live in Fla and have what looks like white barnacles growing on my milkweed. During the season, I never spray any foliar treatments on milkweed because monarchs use their feet and head to detect whether a plant is milkweed. One potential bacteria that causes this to happen is: Hi there. The acceptance from the EPA is based on data from extensive testing on each product. Alcohol, however, also is lethal to monarch eggs and larvae, so care must be taken when dabbing. I grew my seeds in 8 “cow pots” sitting in a plastic container sitting on heat mats and all under lights. Will hydrogen peroxide kill bugs in soil? I’m new to the this and don’t want to do anything that is going to worsen the situation. It starts off with small Yellowish brown bumps all over the underside of the leaves. Here’s more info: As for the rest, are you in a region with increased mosquito spraying this season? I also have had funky looking milkweed leaves that fed my caterpillars just fine. Hi Maureen, whenever your treating plants with anything whether it’s a pesticide or considered monarch-safe, it’s always good idea to apply when there are no monarch eggs or caterpillars on the plant. I don’t want to hurt them.. Insect that kills Monarch Butterfly caterpillars Location: North Central Wisconsin August 1, 2010 7:33 pm My aunt saw this bug killing one of the caterpillars in her garden. Funguses are often the result of too much rain or watering. I only spray water on monarch-occupied plants. I would try them. Please! Maybe also writhing in the cage? Since these caterpillars like to hide during the heat of the day, they will find their way into and under the burlap bags, making it very easy for you to kill lots of them quickly. So I’m unsure why after many months it’s begun dying. I thought of cutting down the plant totally just in case I missed something. I try to limit my caterpillar shit inhalations as much as possible. Hello! Hi all, I know that bud washing is a pretty contentious process, but I had a heavy attack from caterpillars (and some bud rot that followed). Do you know what it is? It has never developed into a serious issue, so I don’t believe it’s a fungus/disease. I suspect they came from the same butterfly and the sae thing would have happened in the wild, but it’s horrible to watch. I also removed a few of my plants with spots which were seedlingd last year so they were still small this year. I've been very vigilant about my treatment, using tea tree oil, borax, hydrogen peroxide, lemongrass oil, eucalyptus oil, and apple cider vinegar. As of this morning I have officially lost over 40 caterpillars again. I have 5 monarch chrysalises safe inside now. Hi Marcella, I remove problem leaves and discard. Hi Pat, I’m not familiar with the issue. The black spots on my curassavica look exactly like your picture so I’m going out right now to remove the unhealthy ones. Zero loss of potency and it's crazy how much shit comes out of them and how much better the smoke is after. 10% hydrogen peroxide will kill weeds. I've wiped out the little bastards with BT, but now I'm wondering if a bud wash would be a good idea to clean off any residual BT and leftover caterpillar poop. You might be familiar with the butterfly gardener catchphrase plant it and they will come. Thank you so much for this! Is it a light dusting or a drench? What is it. Plant diseases shouldn’t affect caterpillars, but if you have access to healthier milkweed I would use that. But right there is a possible answer~~RINSING. It begins on the edges of the leaves and gradually the whole leaf becomes purple. Is this from too much shade or what? I’m in Houston and have been raising asclepias for 25 years. Hi Donna, in Minnesota I used the treatment preventatively in the soil before milkweed returns. What can I do to save the plant? Any suggestions? Most universities have a insect rearing lab that could answer your question. The only plants not infected are the family jewels plants. I’m not sure if foreign substances would affect their perception…again, you can always test. For the first time, my milkweed is covered with rust fungus. I want to get ahead of the fungus this year because last year I was far behind. They are Less than 1 Year old. The soil is probably already pretty acid but I will check it just to be sure. All my tropical milkweed has the black spots and then turns yellow. I would not spray with the solution if any caterpillars are on the affected plants but rather remove them, then spray. I can’t find anything that says if this is normal Fall behavior or not (chicago, zone 5b). Little yellow spots have developed on the leaves. I try and let the caterpillars do it, but in areas where there is rust the stem just seems to die. Hydrogen peroxide also helps your plants grow by putting more oxygen into the soil. Will the hydrogen peroxide spray hurt Monarch catepillars? I would like to try the hydrogen peroxide/water spray (I read thru the instrux) and BUT I’m not totally clear: can I do this while caterpillars or eggs may be present? I didn’t see anywhere that talked about how often you can spray. I have 4 plant. I hope the disease pages link helps you figure out what’s going on…good luck! was it the 1 tablespoon of 3 % for each cup of water? I have some yellow/orange looking leaves. You have been a tremendous help to me! I would research thoroughly…good luck! Replenish their milk?– for fungi similar to blackspot, try this simple rose remedy after removing the affected leaves: note: If you’re spraying sickly milkweed and notice webbing on the plant, you’re probably dealing with microscopic (almost) spider mites and can check out our milkweed pests page for specific treatment options. To spray on sick or fungusy plants: TO THIS AMOUNT OF WATER ADD THIS AMOUNT OF 3% HYDROGEN PEROXIDE 1 cup --1 tablespoon 1 pint-- 2 tablespoons 1 quart-- 1/4 cup 1 gallon-- 1 cup 5 gallons-- 5 cups 10 gallons-- 10 cups 20 gallons-- 20 cups As you may notice, the amount of peroxide in the chart for sick and fungusy plants is twice as much as … All of it is infected. I have searched for problem solving issues but am not sure what to try now. When leaves turn yellow, or start getting spotting/discoloration, try one or more of the following: If you’ve successfully conquered milkweed diseases by using other techniques not listed, please share your experience and help a gardener out…, Valentine Gift Ideas for a Butterfly Lover, Start or Improve your Monarch Butterfly Garden, Butterfly Garden Book for Monarchs- Instant Download, Top Tools, Supplies, and Resources for Raising Monarch Butterflies, Monarch Butterfly Kits to Raise Caterpillars into Butterflies, 25 Milkweed Plant Ideas for North American Butterfly Gardens, Winter Sowing Milkweed Seeds Part 1: Supply Checklist. No way. I have successfully released 4 with 2 chrysallis pending. Is it dangerous for the caterpillars to eat these leaves? I have a bunch of seeds to plant and no safe place to plant them now . In Indiana it’s Purdue. I noticed one of my plants started getting the yellow curled/twisted leaves that you mentioned is caused by leafhoppers. It can be especially bad with curassavica. Many plant diseases and fungus are the result of low oxygen levels in the roots. It has to be the milkweed, do you think the late season milkweed (tropical) could have oem that doesn’t wash off. it may perform better if it’s allowed to go through the winter part of it’s growth cycle, which it is able to do in perennial zones that still experience a true winter where the plant dies back. I would focus on adding more pesticide-free milkweed plants to your garden, or there won’t be enough to feed them all. The milkweed in my backyard raised bed is afflicted by this. I use the measurements for sick/fungusy plants…2 cups in a 2 gallon watering can of the 3%. 4. Do you know what would cause this stunted growth and discoloration? I don’t think there is any disease of a milkweed plant that will kill caterpillars. Although hydrogen peroxide is a disinfectant and antiseptic, it is not as effective as copper fungicide in preventing late blight on tomatoes. This year I’m really confused and scared. They then told me because I’m using tropical plants and not native that that was the problem. Spined Soldier Bug Nymph (we believe) feasting on Monarch Caterpillar. I’ve brought them in and have them in their own cage. My question is I now have Monarchs laying eggs. Its been damp lately but the plants have been protected from being rained on directly and I have only been watering them minimally. They have basically “keeled over” on a branch and died. Yeah, I'm kinda scared to see what comes out of my buds. Those little beggars will crawl up your arm and bite like chiggers and will drive you crazy for a day. hi Kat, if your plants are getting too much direct sun too quickly the leaves can burn. It is working its way up from the bottom of the plants. Thank Tony, for the leafhopper damaged post. There are links in the post for how much to use…we use the chart for sick/fungusy plants. Oddly- my neighbors yard has become overgrown with this same type milkweed which were healthy until this past week the leaves have a silvery blackish spotting along them. I thought it was from the heat and lack of rain this summer, but now I’m going to remove all of the yellow mishapen plants and hope for some healthy ones to come back up. When they are soon going to molt, they generally crawl away from the milkweed and sit still for hours (even up to a full day). It was the 1st one I’ve seen this season here in Massachusetts. I have gotten better, and I'm covered in scars. Could I have maybe just beat them up a bit too much when I was washing them? I’d also like to add that last year I had the worst aphid infestation imaginable. Hi Tony, I live in MA and have about 9 growing cars of various ages. Tropical milkweed is almost all you can find here, but it is suggested that it’s long season may discourage mmigration to their winter sites in Mexico and contribute to the OE problem. Several seemed to have tried to chrysallis to early since I see the silky black pile on the leaf and they were very small. I had about 20 healthy butterflies emerge this spring, but the next 10-12 were all diseased. Hey Tony, will spraying my milkweed with the hydrogen peroxide mix for fungus hurt monarch eggs or cats. Lots of foliage since I trimmed it back. nope…just the 3% commonly found in stores. During that time I have raised a few hundred monarchs very successfully indoors. I don’t think it would hurt eggs, but I would suggest testing it out before spraying them in mass…. Tony Gomez says. Plants affected by this should be immediately removed and discarded. I see little black dots on the leaves as well- which makes me wonder if it’s an insect causing this? Could it possibly be water related—not enough or too much? I normally use a pint of Hydrogen peroxide to 3 gallons of weed, and ice and water . I recently bought and planted 4 nice sized Asclepias curassavica ‘Silky Deep Red’ – Red Butterflyweed plants. Hydrogen Peroxide (H2O2) it is made up of Hydrogen (H2) and Oxygen (O2), however H2O2 has an extra Oxygen atom in an unstable arrangement – it is this extra negatively charged Oxygen atom that gives H2O2 its useful properties. I have them in some pretty sunny places, like full sun and heat most of the day. It can be used as a foliar spray to control fungal diseases like powdery mildew, or to control microbial pests in the soil or small insects like spider mites and fungal gnats. I have been wondering what the heck is wrong with my plant! Every bit of my milkweed has the rust colored fungus and my catties are eating them, so I hope the fungus doesn’t hurt them either. What could be causing this problem? I also have some butterfly bushes that have a little bleach looking area, but the milkweed is more worrisome for me. Spray early next season including the soil before plants emerge…good luck! I would also try spraying the remaining stem with a hydrogen peroxide mix…see the chart linked in the article. Or is it not getting enough sun? I don’t spray monarch eggs/caterpillars directly with hydrogen peroxide and not sure if/how it would affect them. The thought of insect shit in the weed is a major issue for me ,,, I haven't ever dealt with that issue myself .. Spider mites and fungi/mold I have . Thoughts? The herbicide kills all plants in its path, except for the GE crop. I would not spray with the solution if any caterpillars are on the affected plants but rather remove them, then spray. I have several milkweed plants in my lanai. These shelters can be bought online. Mist the milkweed plants from above so water mist rains down on them. Would aphids cause leaves to turn yellow? What can I do to prevent this without hurting the plant or cats? Hi Michelle, we use h202 preventatively (in spring before milkweed emerges) and to overwinter plants indoors. I’ve got them separated into three different milkweed cuttings. I planted a butterfly and pollinator garden a couple of months ago. It does wonders for the aphids. Not sure I want to go there. I have not used bacteria based fungicides before and don’t know how they would affect monarchs or your local ecosystem. Last updated on May 19, 2020 More info here: I planted tropical milkweed in a sunny area in my moist garden about four weeks ago. Is it safe to use the solution on the plants with eggs? I have since removed my other cats onto another plant. We are in SoCal with some really hot temps now. After yesterday’s wild feat i expected most of these leaves to be gone by now. Hi Kurt, I always cut off problem leaves and sections of the plant if necessary…I would also check to see if you have spider mites by spraying a leaf to see if you can webbing. I watered the soil with hydrogen peroxide earlier this spring (before plants start coming up). I live in central Florida. Check out our pests page: Tony. There are flies that predate on the caterpillars and young chrysalides. While DEET may kill aphids on your milkweed, it’s also going to kill monarch eggs and caterpillars. It flourished this way. This strategy has worked well to keep our milkweed patches healthy and ready to support monarchs. Should I try and find new cuttings from a different source? I’ll send a photo if you can tell me how. This develops on the leaves then the leaf yellows and drops off. I sure would like to get some input so I can get back on the right track and stop killing all these caterpillars. 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