Hi Kathryn, check out this info for how we use hydrogen peroxide. When planted a few weeks ago we were in the low 80s. What can I do to save the plant? According to a Sept. 15 statement, three Zep disinfectants kill COVID on surfaces in just one minute. I have some yellow/orange looking leaves. I don’t generally treat plants outdoors after the season has begun. 1/4 cup of 3% Hydrogen Peroxide; 2 tablespoons of Rubbing Alcohol (or old-style mouth wash like Listerine) 1/4 tsp. Thanks. Prepare a cup of soapy water or half-alcohol and half-water mixture. I don’t spray h202 on eggs/caterpillars so I can’t say for sure if it would harm them. Hi Pat, I’m not familiar with the issue. The wings that don’t open and deformed chrysalises would make me thing there has been an OE infestation. Hi Brenda, you could always try spraying leaves with a hydrogen peroxide solution and/or removing affected leaves as is listed in the post…, Will the peroxide help with rust spots do the leaves and will it hurt the caterpillars . I’m new to the this and don’t want to do anything that is going to worsen the situation. The black spots on my curassavica look exactly like your picture so I’m going out right now to remove the unhealthy ones. It can also prevent another common fungus that causes milkweed to wilt and die. Thanks for all you do. Is this a water or soil condition issue? Remove sick leaves– Whenever you come across sickly milkweed leaves, remove and discard. How do I know if the cuttings are ok for these caterpillars? You can control their population easily. Green liquid from your caterpillars? I soak the soil with the solution before plants start coming up. I’ve removed each purple leaf and examined them carefully. I have 4 plant. Most universities have a insect rearing lab that could answer your question. Hi Erin, Asclepias curassavica does not ‘contain’ OE spores…they are left on the plants by sick butterflies taking nectar and/or depositing eggs. Just break off yellow leaves and discard. Can they be eating the eggs and cats? There are links in the post for how much to use…we use the chart for sick/fungusy plants. 4. These often kill the caterpillars just before they pupate, or during the pupa stage. Please! of wetting agent (dishwashing liquid will do) Use this mixture as a foliar spray to keep your plants healthy and free from bugs. They then told me because my plants were indoors that that was the problem. Hi Sara, this happens to milkweed in mid-late summer…most often on swamp milkweed. Thank Tony, for the leafhopper damaged post. Yellowing leaves can be from too much or too little water…adjust water levels to see if this makes a difference. I use the measurements for sick/fungusy plants…2 cups in a 2 gallon watering can of the 3%. It flourished this way. If you cut back the burnt foliage, new growth should appear healthier…good luck! Hi Ralph, I only spray plants after I’ve checked for eggs and caterpillars. I've been very vigilant about my treatment, using tea tree oil, borax, hydrogen peroxide, lemongrass oil, eucalyptus oil, and apple cider vinegar. I use hydrogen peroxide preventatively on soil and small plants. They have basically “keeled over” on a branch and died. The milkweed in my backyard raised bed is afflicted by this. Stop Milkweed Pests from Ruining Milkweed for Monarchs. I also removed a few of my plants with spots which were seedlingd last year so they were still small this year. PS…I don’t think it would be toxic to future eggs/caterpillars, but you could always rinse off the plants with water if you are concerned. I’m not sure what causes it, but it’s never been a serious problem. What’s even worse is that the hole Corn Borers carve into the stems creates an open doorway for other pests that will complete suck the life out of your marijuana plants.Hemp Borers will damage the buds (see picture). hi Meg, if it’s not planted in well drained soil, root rot is a possibility, although i haven’t seen this with tropical milkweed in our northern region. We are in SoCal with some really hot temps now. While there are plenty of insecticides on the market that can kill insects, there is a much kinder approach and a more effective one. I removed the whole plant to be safe and when I checked the underside of all its leaves I found 2 small cats. More info here: What is the best way to trim back my milkweed? I’m worried that if it continues happening in the weeks ahead, we may end up with not enough leaves for our monarch caterpillars to munch on. This year I’m really confused and scared. Monarch caterpillars rely on milkweed plants and that’s why female monarchs choose to lay their eggs on milkweed plants. No way. Then you’ve come to the right page…. How can we detect if a plant is infected with the parasite? hi Kat, if your plants are getting too much direct sun too quickly the leaves can burn. 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. I put it in a large glass spaghetti jar filled with water and just the leftover loose soil that was on the roots. I’m not positive but it might be leaf scorch from too much sun. I was thrilled and spent as much time as I could watching and photographing them. A: There are many diseases and parasites that kill monarchs, including viral, protozoan, fungal, and bacterial infections. I’m not sure what triggers it…perhaps cooler temps or less sunlight? I have hatched over 90% by protecting them. If there are too many on a plant, do they try to go elsewhere? Happy Raising! If I water my milkweed plant (from the base) it turns yellow, if I dont water it wilts. I also need to know if it’s safe to spray with H2O2 solution when eggs and cats are present? Everything is super clean. I would post your photo in a facebook group like this: My swamp milkweed plants has reddish/purple edges on some of the leaves. 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