Stink and squash bugs can ruin a perfectly good summer crop, but we have tips on how to prevent that from happening. Elaine Haire, Placer County Master Gardener, wrote an article for the Summer 2001 issue of The Curious Gardener on how to prevent, identify, and remove the pesky critters from your vegetable garden. Click here to see the full article.
- Consperse stink bug
Named for the strong odor they give off when disturbed. stink bugs are shield-shaped with a large triangle on their backs. Consperse stink bugs are speckled grey and brown and prefer fruits and vegetables. Infested pears or peaches will develop “dimples” or depressions around the feeding sites, while infested tomatoes will have a smooth skin but with green or yellow discolorations on the fruit.
- Harlequin stink bug
The harlequin stink bug has very distinctive black and red markings and prefers broccoli, cabbage, or radishes. This bug will leave yellow or white blemishes on the leaves where they feed.
One of the good guys! Two-spotted stink bug.
There are two stink bugs that are actually beneficial to your garden, so watch out for the two-spotted stink bug and the rough stink bug as you want to leave these guys alone!
- Rough stink bug
- Squash bug
These bugs are grey/brown with orange around the edge of their bodies. They feed on squash and pumpkins. The first sign of damage is small brown specks on the leaves, which left untreated will eventually cause the plant to turn yellow and die.
For the squash bug, try to plant resistant varieties of the crops they like, for example: the butternut, royal acorn and sweet cheese squashes are all squash bug resistant. Consider planting nasturtiums or marigolds as they will attract squash bugs away from your crops. For further prevention, apply and remove row covers before the first bloom. Also look for shiny brown egg masses on the underside of leaves and destroy them.
To control the stink bug, look on leaf surfaces for clusters of barrel-shaped eggs to smash. Take a second to inspect these egg masses for darker colored parasitized eggs. Be sure not to destroy them unless there is a jagged emergence hole. If they are not parasitized, go ahead and squash them. Pheromone traps are also available for the detection of stink bug migration.
For prevention of both bugs, consider planting insectary plants near the susceptible crops which will provide nectar and pollen to attract natural eneimes such as the tachinid fly to prey on squash bugs or the parasitic wasp to kill stink bugs. Attracting birds to your garden is another helpful way to get rid of both bugs. Garlic based materials can be used as repellents.
During the growing season, remove weeds, dead leaves and garden debris to deprive these bugs of a place to hide.
After the growing season, reduce overwintering hiding places by removing all debris, and destroying crop residue by disking or composting.