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| Has anyone used beneficial nematodes to combat asiatic beetles? I've had problems with them in my garden this year and would like to use nematodes, but I'm not sure when to apply them, or what is the best source. Any advice? Thanks! |
Follow-Up Postings:
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- Posted by ken_adrian z5 (My Page) on Wed, Jul 10, 13 at 16:57
| dont waste your money??? are you absolutely positive on the ID?? is your lawn treated??? what kind of damage.. and how severe??? ken |
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| Hi Ken, It's not my lawn, but my garden. They ate my astilbe blooms and a few other things. I'm sure of the ID because I saw the adults in action with a flashlight at night. But I don't know much about the timing of grubs' life cycle and I certainly don't want to waste my money. If nematodes would not be effective I won't do it...just wondering whether anyone else has had luck. My gardens are pretty small. thanks! |
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| I know that the nematodes are more effective on smaller the grubs. They don't effect the adults as far as I know since the adults aren't in the soil where the nematodes are, so you'll need to wait until they start laying eggs and the grubs start developing. The ground should be watered first before spreading the nematodes and also daily afterwards for at least two weeks since the nematodes need moisture to move around in the soil. So I guess that's a rambling way to say that for this year you'll need to patrol with a bucket of soapy water to knock the beetles into, and then spread the nematodes later in the summer to kill the grubs that will produce next year's beetles. If possible, get your neighbors to do the same, since the beetles can fly and the wider the area over which preventive measures are, the fewer beetles you'll all see next year. |
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| Thanks, Babs. I think their adult season is almost over--I no longer seem many of them around the light at night. But I'm not sure how to know when they are in egg-laying vs. grub-forming cycle. I may just have to do some research on my own. |
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| Hm, according to this the season is not almost over. I wonder why I am not seeing them around--maybe because they ate everything yummy in my garden... http://extension.umass.edu/landscape/fact-sheets/asiatic-garden-beetle "The larvae pupate in late June, with adults most abundant in July and August. Adults may be present until October. The adults are highly attracted to light and may be very numerous at windows, doors, or wherever there is a bright light. Since adult beetles are nocturnal, they are seldom seen on host plants where damage occurs. At dusk, beetles leave the ground, where they have been hiding during the day." |
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