How to Take Care of Inchworms
To care for inchworms, line the bottom of a glass or plastic container with an inch of dirt or wooden shavings, and poke several small holes in the lid for ventilation. Then, add pieces of leaves and stems to the container for the worms to eat, making sure to replace them if they start rotting. Additionally, spray the habitat habitat regularly with water to hydrate your worms, and open the window several times a day to let in fresh air.
Prepare a habitat. Purchase a terrarium with a ventilated top from a pet store. Or, make your own habitat with a lidded container made of glass or plastic. Poke several small holes through the lid with a thin nail or similar tool (no thicker than the tip of a pencil) so air gets in, but the worm doesn't get out. Line the bottom with about an inch of dirt or wood shavings. Inchworms aren't that strong, so you can use aluminum foil, plastic wrap, or something similar as a lid so poking holes is easier. Pick a spot for it on a windowsill or near a window so your inchworm gets plenty of sunlight. Hunt for them in spring. Be aware that inchworms have pretty short lifespans. Expect them to cocoon and turn into moths toward the end of summer. So, to spend as much time with them as possible, look for them soon after they first hatch from their eggs in spring. Eggs typically hatch when the weather rises to 50 degrees Fahrenheit (10 degrees Celsius). When they first hatch, they're very, very small, which means they're harder to find. They usually take about three months to grow full-sized (about an inch long, or 2.5 cm). Include leaves and stems in your habitat. There are thousands of different types of inchworms, and each one eats different foods. So when you find one for your habitat, also trim some of the leaves and pieces of the stem from the tree or plant that you find them on. Add these to the habitat so your inchworm has something to eat. Remember which tree or plant you found them on, or at least what type it is. This way you can collect more leaves if needed to keep your inchworm fed. Check your inchworm daily. Check the leaves and stem pieces that you added to make sure it has enough food. Once they look like they're beginning to rot, clean out the habitat and collect more leaves, stems, and dirt from outside. Spray a mist of water inside every so often so they stay hydrated. Also, keep fresh air circulating in the room by keeping the window open. If it's too cold or hot outside to keep your window, at least crack it open a few times throughout the day. Eventually they will cocoon themselves and then turn into moths. Keep their area moist and with sufficient light; they will turn into moths in about a few weeks. When that happens, you need to let the moths go outside. Simply unseal the container in the area that you originally found the inchworm. Look for signs of feeding. Check leaves of trees and plants for lots of little holes, which show where inchworms have been munching. Also look for leaves that have been stripped totally clean. They've probably moved on from that leaf by now, but this shows they're in the immediate area and will help narrow down your search. Since you're probably searching during the spring, plants and trees may still be blossoming. If so, you can also check the buds for signs of munching, since inchworms will eat those, too. Search in shaded areas. Lots of animals feed on inchworms, so expect them to hide. Check the underside of leaves to see if any are clinging directly to them. Also check for them in midair, since they spin webs just like spiders, and may be dangling well below leaves and branches. You may also find them on the ground, but this usually happens when they've fully matured and are ready to cocoon underground. So if you're looking for inchworms to keep as pets, these are no good, since they're ready to change into moths. Check areas with crowded vegetation. When an inchworm is done feeding on a leaf or plant, it spins a web long enough for it to swing to the next, like a rope. So look where the leaf cover is pretty dense, where they can do this more easily. Also, since each type of inchworm feeds on different types of food, look in areas with lots of the same type of plant or tree. If you're looking in trees, also check the plants growing around its base. The inchworms may have worked their way down to them. Look at night, too. Start searching in the daytime, since it's easier to spot where they're feeding in natural daylight. Some inchworms feed during the day, so you may find them right away. If not, this particular type may be nocturnal, so grab a flashlight and double-check after dark. Identify signs of damage. Inchworms are small and may feed at night, so recognize other signs of infestation, since they may stay out of sight. Look for little holes in the leaves of your trees, bushes, and garden plants. The more you see, the more likely it is that you have a large population of inchworms. Inchworms are commonly attracted to elm, fir, hickory, maple, oak, and pine trees. Since they also eat fruit, they can often be found in berry bushes and fruit trees. Ask yourself if it’s really a problem. Before you go through the trouble of trying to solve it, decide if it's really worth the effort. Consider where you found evidence of inchworms, and how pervasive it is. For instance: Individual inchworms don't eat much, so if you only find sporadic leaves that seem to be eaten, the population is probably small. If the leaves in question are confined to trees, the trees may offer enough food to support the population without widespread damage. Smaller plant life, like garden plants and bushes, are more at risk, since they offer less material for the inchworms to feed on. Let predators do the work. Lots of small animals feed on inchworms, so encourage their presence. Birds are perhaps the easiest (and preferable) to attract, so hang bird houses and feeders around the affected area. In addition to birds, inchworms are also prey to: Lizards Yellow jackets Wasps Treat the affected area with pest control. Spray the leaves or the worms directly with insecticides, which are an effective means of dealing with inchworms. Or, if you're worried about toxins, use a non-toxic remedy. Instead of traditional chemical poison, use a natural pathogen, like bacillus thuringiensis, which you can find online or in garden stores. Bacillus thuringiensis only affects insects, making it an ideal solution for gardens, fruit trees, berry bushes, or other crops. Treat the area again next spring to eliminate any eggs that may have been fertilized during your last infestation. Different types of inchworm reproduce at different times, but all types hatch in spring. 
Prepare a habitat. Hunt for them in spring. Include leaves and stems in your habitat. Check your inchworm daily. Look for signs of feeding. Search in shaded areas. Check areas with crowded vegetation. Look at night, too. Identify signs of damage. Ask yourself if it’s really a problem. Let predators do the work. Treat the affected area with pest control. 