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Q&A: Japanese Beetles on Roses
Answer: Japanese beetles are a difficult pest to control. Your best bet is a two-prong approach: one to deal with the larvae, one to deal with the adults. Japanese beetle larvae are the white, C-shaped grubs you find in the soil. They are best controlled by spraying beneficial nematodes on the lawn and garden area. The microscopic, worm-like nematodes harm only the grubs in the soil and not plants, animals or humans. Spray them in spring when the temerpatures are above 55F and you should see a difference this summer. For adult beetles, try handpicking combined with a neem oil spray. Avoid using Japanese beetle traps. In some cases, it appears that they actually draw beetles to them from the surrounding area -- and you don't need to be attracting extra beetles!
Content provided by the National Gardening Association
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Posted Comments:
06-26-2009 17:07
sheila wrote:
controlling japanese beetles
They were a TERRIBLE problem for us. They ate the corn, asparagus, japanese and weeping cherry, etc. Try 'Milky Spore' available at most garden centers. This product is sprinkled over the lawn to control larvae. It will take two years(and two applications)but IT WORKS. We also used the beetle traps. The one that is a plastic yellow X-shaped top attached to a green bag. Seemed to work best with both the food and sex lures. Also, you want to be sure to place them AT LEAST 20 ft away and downwind from problem areas. It will seem as if they are attracting ALL the beetles for miles,it actually is trapping only the ones nearby. Good Luck!
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