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Managing Cucumber Beetles

mediumGardeningSeasonal

Safety Warnings

  • Use caution when applying chemical pesticides like lead arsenate; follow all label safety instructions.

Tools Needed

Bottomless boxes — Sized to accommodate plant growth without providing excessive shade
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Sticks — Short lengths used as tent supports
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Barrel hoops or bent wires — Used as arcs for stretching netting
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Shingles or boards — Flat materials used for trapping adults
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Materials

Cheese-cloth — Fine mesh fabric(As needed)
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Wire mosquito-netting — Fine mesh screening(As needed)
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Floating row cover — Lightweight garden fabric(As needed)
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Tobacco dust — Natural insect repellent(As needed)
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Steps

1
Practice crop rotation by not planting cucumbers where they have been grown in the last two years to reduce pest pressure.
Tip: This helps break the beetle life cycle.
2
Plant trap or decoy hills of cucumbers, squashes, or melons in advance of the regular planting to attract and harvest beetles.
Tip: This diverts pests away from the main crop.
3
Protect young transplants and seedlings by installing floating row covers, fine netting, or cheese-cloth tents at planting.
Tip: Ensure the covers are high enough to allow growth but tight enough to exclude insects.
4
Secure cheese-cloth tents using stones and earth to hold down the edges.
Tip: Alternatively, stretch mosquito netting over barrel hoops.
5
Apply tobacco dust plentifully over and around the plants to act as a repellent.
Tip: Ashes or lime may also be used for similar efficiency.
6
Remove row covers and netting before temperatures become too hot in midsummer.
Tip: Timing is critical to prevent overheating the plants.
7
Perform hand-picking of beetles from the plants to manually reduce the population.
Tip: Hand-picking is one of the most sure methods of immunity if covers are not used.
8
Place shingles or boards on the ground around the plants to trap adult beetles.
Tip: Beetles congregate under these boards; lift and destroy them.
9
Monitor plants for the appearance of beetles and control them immediately to prevent the spread of bacterial wilt.
Tip: Early detection is key to saving the crop.
10
For severe infestations of the twelve-spotted cucumber-beetle, apply sprays such as lead arsenate.
Tip: Always prioritize physical barriers before chemical interventions.

Pro Tips

  • Beetles can ruin young plants if left unchecked, making early protection essential.
  • The striped cucumber-beetle is yellow with three black stripes; the twelve-spotted beetle is also common.
  • Preventing beetle access is the primary way to stop the spread of bacterial wilt in cucumbers.

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Sources

Synthesized from 5 verified sources:

Gutenberg: War Gardens GuideView →
Cornell ExtensionView →
Gutenberg: Manual of GardeningView →
Old Farmer's AlmanacView →
Cornell ExtensionView →