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Butterfly caterpillars are very specific with their diet. They will eat only one family or one type of plant.
For example, Monarch caterpillars will eat only Milkweed. If all the milkweed in the world died, all the Monarchs would die.
Your first step is to obtain a sufficient amount of pesticide free host plant or artificial diet for the butterflies you plan to raise. Some species of butterflies eat a vast quantity of leaf matter while they are growing caterpillars.
PESTICIDE OR INSECTICIDE AND DOG/CAT FLEA CONTROL
Insecticide will kill your caterpillars. In most cases, if you have purchased a plant which has been treated with pesticide, eight weeks after it has been treated, it will be safe to use. If you purchase a plant which has been ‘organically’ certified, it still could be fatal to your caterpillars. BT is acceptable for use on organically grown plants. If pesticide or insecticide is sprayed in the building where your eggs, caterpillars, chrysalises, or adults are located, it may kill them also. Dog and cat flea and tick control, both oral and topical, may also kill your caterpillars. Wash your hands thoroughly before you touch their rearing container.
START AND STAY CLEAN
Start with clean/disinfected containers for your eggs or caterpillars. Butterflies contract dreadful diseases. If your rearing containers have been used in the past, disinfect them. even if you did not have a disease problem with your last batch of caterpillars. Washing in the dishwasher is sufficient. If your container is too large for the dishwasher, soak it in a bleach/water solution and rinse well. If your container is mesh, it can be washed in the washing machine if it does not have wire inside it. If it is a memory wire popup habitat, it can be disinfected in the tub or sink indoors or in a container outdoors. Always, always, wash your hands before feeding or tending to your caterpillars.
When your eggs arrive, immediately place them with the host plant. If they are on a leaf, you can simply staple or pin the leaf with eggs to the living host plant. If you are rearing them from egg in a container with cut food, add fresh tender leaves every day. Butterfly and moth eggs will dehydrate quickly in a building. Air conditioning and heaters remove humidity from the air. Although it is important to keep butterfly eggs from dehydrating, it is also important to prevent them from sitting in an airtight container. They need air. A closed container without air flow is a perfect spot for mold and bacteria to grow. When your caterpillars emerge from their eggs, watch them! Their first meal is usually their eggshell.
It is extremely important to feed hatchlings tender new leaves. Older leaves are often too tough and baby caterpillars simply die from starvation because they cannot always eat older leaves.