Can I spray Hydrogen Peroxide on Monarch Eggs and Caterpillars?
I use hydrogen peroxide preventatively on soil and small plants to kill potential fungi and pathogens. I only rinse/spray water (without peroxide) on leaves with eggs or caterpillars. Since h202 is highly diluted, eggs or caterpillars accidentally sprayed should be ok, but we avoid spraying them with any substance except water.
hydrogen peroxide for milkweed chart