If the plant is young like a seedling, they can be killed by cucumber beetles. Companion planting can help repel cucumber beetles naturally from your cucurbit plants. The least-toxic method of extermination is hand-picking and dropping the pests into a bucket of soapy water to drown. Because of their large size, you can easily suck them up and off your veggies. The cucumber beetle has 3 full generations to feed on growing plants in southern states. Soap allows water to wet surfaces better. Be sure you buy FOOD GRADE diatomaceous earth- NOT the one used for pools. Don’t just hang them from any stake or branch. Use multiple techniques at the same time and see what works. You should always be properly rotating your edibles. During this time, they’ll eat, mate, and lay eggs all around the host plants. You can also use plastic, vinyl, or other artificial materials. What does cucumber beetle damage look like? After September ends, the adults overwinter near field edges of host plants once again. Striped cucumber beetles will eat up plants as an adult and larvae. Be sure to empty the canister or vacuum bag after you’re done. Larvae emerge in august and continue to remain active until September. The first line of defense against Japanese beetles may sound old-fashioned, but it works wonders. Their main target is nothing other than your cucurbit plants (squash, melon, cucumber, corn, eggplant, tomato, etc.). However, cucumber beetles DO bring diseases to your plants. And then you also have cucumber beetle larvae that eat up your veggie roots. Hi ! Place the jug in your garden. There’s a little creativity involved with these kinds of things. The pool-based DE is dangerous for edibles. This means a constant influx of both adult beetles who will eat up your plant leaves and flowers. The Japanese Beetles will not survive the cup of soapy water. Here are a few types of nematodes good for killing cucumber beetles: Beneficial nematodes can usually be used anytime during the year when cucumber beetles are active. Always rinse afterward. To minimize the chance of having a cucumber beetle infestation, rotate plants to avoid overwintering and shield young seedlings. They’ll happily eat your cucumber beetles, but they’ll also eat cabbage loopers, flea beetles, cabbage worms, and many more. Spray once a week (or for more serious infestations, every 4 days) for 4 weeks until you see improvement. The eggs can be seen with the naked eye and are found in clusters at the plant base. Both of these combined proves to be a devastating combo that can kill your cucurbit crops. If infestations are severe and an insecticide is used, it must be used with caution to avoid injury to bees. Where do cucumber beetles lay their eggs? On stone fruit trees, early harvest may be the only option. What sort of beetles? You want it to mix in not foam up. Use a wet sponge and dip it into the bucket and then “wipe” the leaves and stems of your cucurbit plants. Here are some other aliases that refer to the same pest: Striped cucumber beetles are known for their most distinguishable feature- the stripes going down their backs. They have dark heads with three pairs of legs. Inspect chewed leaves, petals and fruits for adults (especially leaf and fruit undersides touching soil), in flowers and at stem bases. There are multiple ways to pick them off your cucurbits. Soapy water can be an effective DIY pesticide for striped cucumber beetles. Next, you’ll toss them into this soapy water. Beetle larvae are hidden under the soil and will feed on the plant roots. The new additions to the solution will not affect the culling of regular beetles. Beetles overwinter as adults in weedy areas and move into our gardens as soon as plants start to come up. Collecting individual Japanese Beetles is easiest during the early morning hours when the beetles are cold and sluggish. The western-spotted cucumber beetle is the most abundant species in California. As for cucumber beetles, I have a wonderful new way to catch them. Put in a pump sprayer. The timing of the beetle’s active period during the year matches perfectly with the host plants they feed off of. In fall, remove garden debris as these are likely to become overwintering sites. Striped cucumber beetles have a basic lifecycle just like any other beetle. There are different types. But for cucurbits, I’d suggest rinsing the plant right away after you spray the neem. The larvae of cucumber beetles are about 9mm in length, with creamy white coloration. It will eliminate the adult weevils and will also combat the further infestation. If you must use it, read all directions and use them as directed. Use the tanglefoot and apply it all over the bottle. Mix in one mashed banana and pour the mixture into a 1-gallon milk jug. So then I created this site to share everything I’ve learned over the years (and continuing to learn)- natural solutions that are proven to work against the bug that’s bugging you! The University of California Marin Master Gardeners are sponsored by UC Cooperative Extension. You can make your own beetle trap at home with some basic materials. Here’s a list of what you’ll to make your own striped beetle trap: Cucumber beetle traps can be purchased at your local hardware store or online. 25 posts • Page 1 of 1. DIY tip: If you don’t want to apply the tape to the plant, set up four stakes in opposites to make a rectangle around your plant. Take the cotton balls and tape them to the bottle on the inside and outside. But be sure to examine the soil before you transplant. This major pest of curcubits and culprit in question is the western-spotted cucumber beetle (Diabrotica undecimpunctata) and western-striped cucumber beetle. Remove them and rinse. You could even just till the soil, then leave them on the surface. Follow label directions. Older plants are more tolerant. This will bring up the striped cucumber larvae hiding under the soil getting ready to overwinter for the cold temperatures. A Bucket Of Soapy Water – The First Line Of Defense To Stop Japanese Beetles. You’ll have to buy this online as it’s hard to find unless you have a specialty greenery nearby. But they like my hardy hibiscus and so do the bees. Yes, cucumber beetles are NOT a beneficial insect for anyone who’s growing cucurbit plants. 81 Posts . Handpick adult beetles from plants and drop them in soapy water to kill them. Then apply the sticky tape from each stake to make a barrier or tape. Put on some gloves, long sleeves, and the rest of your PPE. These buggers will swarm your plants and it may look scary as you watch your harvest getting nicked to pieces. Keep people and plants away from the trap to avoid disturbance. I spray the soil and under leaves as often as I need to, if I find any. All you need to do is put down a layer of fabric, hay, or straw coverage next to your vulnerable plants. They disrupt the cucumber beetle life cycle and effectively kill them for good until next season. It depends on how often you clear them out and how you do it. Just be sure to empty the dead beetles because they’ll attract ants to your vacuum if you don’t. Line the perimeter of your cucurbit plant plot with a fine line of powder, Sprinkle some diatomaceous earth directly on the soil surrounding your vulnerable plants, Make a ring of powder circling the base of the plant, Line the entire perimeter of your yard with DE, Use the powder anywhere else you see cucumber beetle activity. There’s no way to surely prevent them from coming into your yard. You need to give it a few days to see how it reacts. Cucumber beetles are difficult to control. You can also use a canister vacuum (wet/dry) or a regular upright vacuum that has a hose attachment. The adults feed on the leaves, stems, and fruits. Just grab a large bucket and fill it up with the solution. Does Soapy Water Spray Help Prevent Garden Bugs?. Will soapy water kill cucumber beetles? It will even kill big cockroaches, squash bugs, etc. Always test it on a single leaf before applying it to the entire plant. Neem oil will kill striped cucumber beetles on contact. Once they’re wet, they ... my plants were infested with the striped cucumber beetle. You can control by hand picking and putting in soapy water to kill them, or you need to spray. About the only thing we have ever found that works -- even remotely -- on blister beetles is soapy water. 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