Our only concern is the state spraying mosquito spray from airplanes. Some of us live so far in the country we don’t have a neighbor close enough for any of their actions to affect our plants. A rain after they sprayed, or irrigation cutting on after they sprayed, could wash the pesticide across the soil and into our yards, where roots of our host plants can draw the pesticide into our plants. We should remember that our neighbors could have sprayed their yards while we were away from home. Many of us grow our own plants and we know our plants have not been exposed to pesticides by our own actions. Learn your nurseries to know which will be honest with you.) (On the other hand, some do understand and will be dishonest with you. Many honestly and truly don’t understand. They haven’t had an interest in butterflies and, try as they might, can’t fully understand your concern. It won’t occur to them that the wholesale nursery may have treated the plants. When asked, they’ll often say that the plant has not been treated. The retail nursery may have no idea that the wholesale nursery has treated the plant and when asked, will honestly say that they have not treated the plants. Any insecticide that will kill thrips will affect and normally will kill caterpillars. ![]() Some plant pests, such as thrips, are difficult to kill. Most customers do not care whether the plant is safe for caterpillars to eat. Most wholesale nurseries treat their plants with pesticides/insecticides to kill plant pests. ![]() The most common source of caterpillar poisoning is plants. Read more about this defense reaction at the bottom of this page. Others must be pestered quite a bit before they resort to spitting green fluid. ![]() Some species automatically spit green fluid at the slightest touch. Other than poisons, the other primary cause of green spit is a defensive reaction to being disturbed. Hemolymph dries to a dark color, nearly black, in less than five minutes. This green fluid is close to the same color as a caterpillar’s hemolymph (blood). If you are in an emergency situation with poisoned caterpillars, click on this sentence NOW. Insecticides and pesticides often cause a caterpillar to spit or vomit bright green. Caterpillars spitting or vomiting green fluid are normally reacting to poisons.
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