It's easy to confuse squash bugs with the similar-looking stink bugs.
Squash bugs present a serious problem to gardeners growing pumpkins and squashes. They feed on the leaves of these plants, damaging and even destroying them. They will even feed on the fruit of the plants, later in the season. While pesticides can destroy squash bug infestations, many gardeners prefer to stay away from synthetic, poisonous chemicals. Fortunately, there is a variety of organic pesticide choices. For best results, apply these organic pesticides right after the majority of the squash bugs hatch in spring.
Neem
Farmers in India have used the wood of the neem tree as an organic pesticide for 4,000 years. Oil derived from the neem tree contains azadirachtin and salannin, which are insecticidal chemicals. However, these chemicals are not highly toxic to mammals. Some organic insecticides based on neem oil are available as commercial products
Sabadilla
The sabadilla lily produces another organic pesticide known as "sabadilla." It contains a natural alkaloidal toxin known as veratrine, which is effective against squash bugs. Use it with caution; sabadilla causes eye irritation and sneezing when it's inhaled. Because sabadilla breaks down quickly when exposed to sunlight, this organic pesticide leaves behind no residue.
Rotenone
Rotenone, a resin produced by certain legumes, acts as an insecticide that's effective against squash bugs. This compound takes several days to kill squash bugs, however, it makes them stop feeding almost immediately after you apply it. Rotenone is somewhat toxic to mammals and extremely toxic to fish, so apply it with care.
Rynia
Ryania is an organic toxin derived from the Ryania speciosa plant by grinding up its wood. Indigenous South and Central Americans have a tradition of using this alkaloidal toxin to kill cockroaches, but ryania is also effective against squash bugs.
Nicotine
Nicotine extracted from tobacco is a highly toxic substance. It's also one of the oldest insecticides derived from a plant that is still in use today, according to Laura Pickett Pottorff, plant pathologist at Colorado State University. Despite its high toxicity, however, it is only effective against squash bugs in the nymph stage. Adults -- as well as nearly mature nymphs -- are resistant to it. Be very careful when handling nicotine insecticides, which can be absorbed through the skin; always wear gloves when handling them. Keep pets and children away from areas where you've applied it.
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