How to Eradicate Cabbage Worms on Cole Crops and Crucifers Pieris rapae
While butterfly collectors may rejoice that the cabbage butterfly now lives in all 50 states and southern Canada, people who grow cole crops and crucifers do not share their joy.
Also known in their adult form as small white, cabbage white, white, or even small cabbage white butterflies, these pretty pests are also often referred to erroneously as cabbage moths in the United States. Use of this common name is understandable, due to their relatively plain and unadorned appearance.
Cabbage worms, the larvae of these insects, can completely destroy a crop of cabbage or other brassicas if left to their own devices.
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While a couple holes in a head are not a big deal, these caterpillars can eventually defoliate plants if they are present in large numbers, leaving only their stems and large veins in place.
However, there are steps you can to take to protect your cole crops from the cabbage worm and butterfly. Let’s explore these methods.
Identification, Biology, and Distribution
The parents of the cabbage worm are small white butterflies (Pieris rapae), one of the most common butterfly species in the northeastern United States.
The half-inch butterflies are white with wings edged in black that also have one or two black spots on them.
While the butterflies are very attractive, they are probably laying eggs on the undersides of the leaves of your plants!
The inch-long caterpillars, often referred to in the US as imported cabbage worms, are velvet green in color with a few faint yellow stripes.
The caterpillars also have several yellow spots down their backs.
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