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Transplant cucumber plants into the ground instead of planting seeds. Plant cucumbers with corn and broccoli to discourage the beetles. Plant a buttercup or Blue Hubbard squash near the edge of the crop. Apply straw mulch to discourage the beetles and encourage spiders. Change the position of your cucumbers from year to year.
If you grow cucumbers from seed, start them inside. When cucumbers are first sprouting, they are more likely to be permanently damaged by these beetles. Starting them inside helps them get large enough to be more resilient against these pests. Intercropping is the practice of planting different kinds of plants together instead of keeping them in separate groups. When planted with crops like corn and broccoli, cucumbers aren't as attractive to the beetles. Plant the cucumbers in rows with corn and broccoli, planting cucumber every third plant.  You can also add corn and broccoli between rows of cucumber. Make sure you're still leaving enough space for each plant to grow. Other plants you can try include radish, buckwheat, and sweet clover. Beetles tend to stay at the edges of the garden. If you plant something else they like better there, they will stick to it instead of destroying your main cucumbers.  Basically, you're sacrificing the plant near the exterior to save your cucumber plants, which is called using a trap plant. You can also treat the trap plant with insecticides to help rid your garden of the beetles. You can also plant other varieties of winter squashes in the Cucurbita maxima family, such as turban squash. Zucchini are also tasty to these beetles. Straw mulch provides a physical barrier to the beetles, though it won't keep them out completely. However, wolf spiders like to hide in the straw, and they will eat the beetles as they pass through.  Sprinkle the mulch in a layer that's about 1-inch (2.5-cm) thick around the young plants, leaving 2 to 3 inches (5.1 to 7.6 cm) around the plant on all sides. Plastic mulches may also discourage beetles. Moving your cucumbers to a new spot next year will help discourage beetles a little. If there is a barrier such as a hedge in between, even better. However, beetles will eventually find the new spot.