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Image: AustinT./Flickr
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Cucumber Beetle Identification
Wondering how to identify cucumber beetles? It’s pretty
easy when you know what to look for. There are 2 types of cucumber beetles and
here’s how to identify each.
Striped: Adult striped cucumber beetles grow to
about 1/4 inch long with black heads and have 3 black stripes running down
their backs that are big enough to identify. Their larvae are bigger, about 3/4
inches long with reddish brown heads and thin, white bodies. (see above picture)
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Image: CamPixie/Flickr
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Common Plants Cucumber Beetles Attack
- Cucumbers
- Pumpkins
- Melons
- Squash
- Corn
When They Feed and Reproduce
Spotted cucumber beetles come out from April to
early June, eat for 2 weeks and lay their eggs. When the eggs hatch into
larvae, the larvae feed for 2 to 6 weeks before turning into adults and
starting the cycle again. Spotted beetles have been known to produce up to 4
generations a year.
Striped Cucumber Beetles come out in spring. The
adults lay their eggs near the soil’s surface, particularly near corn plants
when they are available. Once the eggs hatch and larvae appear, they feed for 2
to 4 weeks before turning into adults and starting the life cycle again.
Striped beetles can produce up to 3 generations each year.
How to Identify Cucumber Beetle Damage
When cucumber beetles have finished feeding and have moved
on to new plants or to lay their eggs, they leave behind plenty of damage
letting gardeners know they’ve been there. To identify damage left by these
common garden pests, look for skeletal-like leaves that have browned and turned
brittle. Also look for holes that have been chewed through flowers and fruits.
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| Image: © Patrice Beaulieu |
4 Ways to Control Cucumber Beetles Organically
1. Floating Row Covers: Protect young plants with
floating row covers as soon as seedlings germinate. This will help keep
cucumber beetles away organically. Watch for plants to flower and as soon as
they do, roll back the floating row covers for a few hours each day to allow
the plants to be pollinated.
2. Wilt/Mosaic-Resistant Varieties: When choosing
varieties of plants for the garden, plant those that are known to be resistant
to wilt and mosaic virus. Seed companies include which viruses and diseases
plants are resistant to in the plant’s description in catalogs and on seed
packets.
3. Non-Bitter Varieties: Cucumber beetles prefer non-bitter varieties of cucumbers so plant non-bitter varieties in the garden.
4. Remove Dead Plants: When the growing season has
come to a close, remove all dead plants and debris from the garden. This
measure helps control cucumber beetles organically because the beetles over
winter under clumps of dead plants.
When it comes to insects, cucumber beetles are one of the
top garden pests in Maine . In
this area, July is the prime month for adult beetles to begin emerging and
leaving behind a path of destruction. The good news for organic gardeners;
these pests can be controlled without the use of pesticides leaving the garden
chemical-free.
What’s Going on in Gibby’s Garden?
It’s mid July and cucumber beetles are out in full force
in Gibby’s Garden. This weekend I noticed the leaves of my squash plants had
been heavily damaged by cucumber beetles. I sprinkled my plants with ground black
pepper. This method is organic and works well in conjunction with the methods
listed in this post. For some reason, cucumber beetles don’t like black pepper,
but hey, neither do I.
Check out Gibby’s Garden Diary to see what else is going
on in Gibby’s Garden.
Related Articles
Reference: Rodale Organic Gardening (2001). Basics:Pests Volume 7. Rodale Inc.
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