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Image: Gibby's Garden
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Cabbageworms (imported) are found throughout the U.S.
and Canada . After
invading the garden and chewing through the leaves of plants, they leave behind
large holes and piles of dark droppings called frass; 2 telltale signs the
garden pests have arrived. Fortunately for gardeners, there are 6 ways to
control imported cabbageworms organically.
How to Identify Imported Cabbageworms
Adult Cabbageworms: Adults are white butterflies
with black-tipped wings. Their forewings have 1 - 2 black spots on them and
their wingspan measures about 1 ½ inches. As adults, cabbageworms continue to
putter around the garden.
Larvae: Cabbageworm larvae are green and velvety.
In the larval stage, these garden pests are in the form of caterpillars
measuring about 1 1/4 inches long. They have a single, yellow stripe that runs
down their backs.
Eggs: Eggs are yellow in color and cone-shaped.
They can be found on the undersides of plant leaves.
When Imported Cabbageworms Attack
Adult cabbageworms come out in late spring to lay their
eggs on the undersides of leaves. When the eggs hatch into caterpillars, they
feed for 2 - 3 weeks on plant leaves, typically on the undersides. Next, they
pupate, turning into butterflies a short 1 - 2 weeks later. These garden pests
produce from 3 - 5 generations a year.
Plants Cabbageworms Attack
- Cabbage Family Plants (broccoli, cauliflower)
- Nasturtiums
How to Identify Cabbageworm Damage
Look for large holes that have been chewed through the
leaves of plants in the cabbage family as well as piles of droppings (frass).
Watch for damage on broccoli and cauliflower florets as cabbageworms will
borrow through these as well.
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Image: Patrice
Beaulieu
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6 Ways to Control Imported Cabbageworms Organically
1. Floating Row Covers: Cover plants cabbageworms
attack with floating row covers. These prevent adult garden pests from laying
their eggs.
2. Purple Cabbage Varieties: Plant these; they are
less attractive to imported cabbageworms.
3. Sticky Traps: Place these near plants
cabbageworms attack, especially those where eggs and caterpillars have been
found. The traps will catch a good majority of butterflies.
5. Garden Clean Up: In the fall, remove all plant
debris from the garden to prevent pupae from over wintering in the soil.
6. Attract Good Bugs: Good bugs, like spined
soldier bugs, green lacewings and syrphid flies all feed on cabbageworm larvae
and eggs and are a great way to control cabbageworms organically. Spined
soldier bugs are attracted to pollinating plants such as goldenrod, hydrangeas
and milkweed.
Green lacewings are attracted to plants such as dill,
caraway, dandelion, angelica, cosmos, sunflowers, goldenrod, and sweet alyssum.
To water lacewings (they are delicate) and keep them in the garden, place a
shallow pan with a layer of gravel on the bottom in the garden and then fill
with a little water. This provides them with a place to drink
without drowning.
Attract syrphid flies to the garden by planting pollen and
nectar, providing plants like wild mustard and alyssum. Surround the garden
with tall, flowering plants like sunflowers to provide a windbreak for syrphid
flies.
Controlling imported cabbageworms organically is a
multi-season task. Begin in the fall by removing all dead plants from the
garden, especially those that have been attacked by garden pests. Do a
walk-through of the garden and inspect plants for eggs and larvae. Get a head
start on controlling the pests by handpicking them from the first time they
appear.
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Reference: Rodale Organic Gardening (2001). Basics:Pests Volume 7. Rodale Inc.
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