How do you kill aphids without killing monarch caterpillars?
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Soapy water may dislodge and kill more aphids, but it also is more damaging to the monarchs and can build up on the plant. Though tedious, dabbing aphids with cotton swabs dipped in isopropyl (rubbing) alcohol is most effective. That kills them outright.
Thereof, are aphids harmful to monarch caterpillars?
The good news is that aphids are not a direct threat to monarch eggs or larvae. Aphids will feed on the milkweed plant only; they won't spread to your other plants. They only tend to be problematic is the plant is very small or weak. We have had larger caterpillars eat the plant aphids and all!
Likewise, people ask, how do you get rid of milkweed bugs naturally?
The easiest and most straightforward way to quickly get rid of milkweed beetles is to use some soapy water that you can easily make at home. Use a mixture of dish soap and water in a 1:1 ratio. Then pour this mixture into a spray bottle. You can then spray it directly onto the beetles on your plants.
Control and Prevention
- Try spraying cold water on the leaves; sometimes all aphids need is a cool blast to dislodge them.
- If you have a large aphid invasion, dust plants with flour.
- Neem oil, insecticidal soaps, and horticultural oils are effective against aphids.