Many gardeners just head to the affected plants with a bucket of soapy water in the morning and hand-pick the beetles when they're sluggish. Just combing them off a branch or gently shaking the branch over the bucket works. Hand-picking is especially important early in the season when the adults first emerge. That's because the first adults to appear emit two pheromones--one to signal other Japanese beetles that they've just discovered a great place to dine, and the other, a signal from females that they're interested in mating. No wonder then that getting rid of those early "announcers" can make a big difference in the next few weeks.
Other options: a botanical insecticide--such as one made from canola oil and pyrethrum--works for a direct-contact spray but it's non-discriminant, killing both bad and good bugs.
Treating the soil with milky spore is a good treatment for the grubs but takes a few years to show its effectiveness. It also works better when a whole neighborhood participates.
http://www.hgtv.com/hgtv/gl_diseases_pes...
How to get rid of the japenese beetles on my roses:(?
spray with seven dust...
Reply:Milky spores. We had a terrible japanese beetle problem. We treated our yard with milky spores--not even the whole yard which was about a half-acre. Primarily the front and sides. The first year after treatment, infestation dropped dramatically. By the following year it was gone completely.
Reply:take your shoe off and start swinging
Reply:spray them with malathion 21,,,,,works every time.
Reply:PEE on them that should do it
Reply:buy that bug dust stuff...don't know what it is called but they sell it at wal-mart and it is for those beetles....
they ate my flower bushes up until i put that stuff on them
Reply:It is the larva that is eating your roses.
You should wait to poison the ground in your yard while it is still warm in late fall. Your neighbors should do the same thing.
Reply:I use Bayer Advanced spray. It is great. Kills the unwanted and leaves the wanted. Great for flowers and veggies alike.
Reply:There are beetle traps available. Hang them right amongst the bush.
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