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Jul 18, 2019 12:31 PM CST
Long Island, New York, USA (Zone 7a)
Region: New York Roses
Grumbling Grumbling Grumbling Grumbling Crying

They are coming at me in force this year. I sprayed with Neem oil and I swear I can hear them laugh as they clump together to devour any and all newly opened buds. Anyone else dealing with them? Any luck controlling them? Tips? I'm thinking of trying nematodes and milky spores next spring. Is it worth applying now? Should I keep applying Neem oil and if so how often?
Jul 18, 2019 3:10 PM CST
Name: Seth n Sam .....
W.V. (Zone 6a)
I had them really bad this year. I tried neem oil spray, I tried hand picking them. They absolutely demolished our Dr. Huey cross. Every single leaf had been ate up and chewed on. For some reason they liked the leaves of it over the flowers on any other rose bush. But unfortunately the only thing that worked for me was Bayer Advanced Rose care. 3 in 1 systemic. Granuals. I only put it around the big Dr. Huey rose bush. Worked in it the soil. Then watered it really deep. And within a week or so. They started leaving it alone. And really havent had a problem with them. They started going after the flowers on our Hibiscus hedges. And have pretty much completely left our roses alone now. I know people dont like using poisons and sprays. We have hummingbirds out the yingyang. And I mean tons of them. So many that when you set on the porch swing they fly around your head. And I was worried about hurting them with sprays and stuff. Bc they do like our roses too. But the jap beetles were eating and mating so much on the dr huey that I was afraid they were gonna kill it. And when they find a food source they mate and burrow around it and lay their larva. So I used the 3 in 1. And boom. They are gone. Except the row of Hibiscus hedges like I said. Out of 11 plants of Hibiscus all over 5 foot tall. They have completely wiped them out almost. And the granuals havent bothered the hummingbirds.

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Jul 18, 2019 3:12 PM CST
Name: Seth n Sam .....
W.V. (Zone 6a)
I also found that neem oil sprayed did absolutely nothing for adult jap beetles. I even tried mixing it at double the strength with absolutely zero success.
Last edited by Weluvroses Jul 18, 2019 6:31 PM Icon for preview
Jul 18, 2019 8:02 PM CST
Name: Carol
Alberta, Canada (Zone 3b)
Oh, I feel so badly for people battling those horrible bugs Grumbling !!!! Good luck every one. Horrid things.
Jul 19, 2019 12:36 AM CST
Name: Rosemary
Sacramento, CA (Zone 9b)
I watched a J & P rose care video that advised working with the Japanese Beetles instead of against them. It said that mid-summer is a good time to get rid of excess growth that is no longer productive and advised some pruning back. There are probably also some that would let Dr. Huey be the deterrent if the Japanese Beetles love it so much. I can't imagine anything that would actually kill Dr. Huey, but maybe I am wrong.
Jul 19, 2019 7:29 AM CST
Long Island, New York, USA (Zone 7a)
Region: New York Roses
Seth, I don't blame or judge you for going the chemical route. I'm holding that in reserve as a last resort but I am going to try my best to avoid that. I'm going to try the nematodes and milky spore next year in the beds and my entire lawn. I've got dead spots throughout which I assume are from grubs and no doubt they've laid a lot of eggs in my beds. It seems like they've lessened a bit this week. Not sure if it's the neem oil (doubtful) or if the generation is dying. I've got some open blooms that have been left untouched for the past two days. Crossing Fingers!

Carol, thank you it's not fun. You spend time and money nurturing your roses just to have them gobbled up - super frustrating. But honestly compared to your obstacles I'm happy to take the JB's on if it means they stay out of Alberta! Group hug

Rosemary, that's an interesting approach I'll have to find that video. Thank You!
Jul 20, 2019 12:36 AM CST
Name: Carol
Alberta, Canada (Zone 3b)
No, I'd rather have my problems than deer, beetles, etc.
It rained today temps were 10C/50F. In my parents' city where I grew up, they had so much rain that a tunnel was underwater and people had to be rescued from their cars. It's supposed to rain all day Saturday too. But we will at least have August as a good month. August is always warm....and since I always live in the moment, I'll forget all about June and July and be happy. Hilarious!
Jul 20, 2019 9:23 AM CST
Zone 9, Sunset Zone 9 (Zone 9b)
Ray, we don't have Japanese Beetles here where I live (thank goodness!) but we do get their dreaded cousins, the Hoplia Beetles. I don't think Neem Oil will help and I would be concerned about using it during hot weather (which I understand you are getting up there). The Neem Oil can burn the leaves of your plant.

I used beneficial nematodes this year (after my infestation) and will again use them in the fall and probably again next spring. That is supposed to help to get rid of them. I hear (but have no experience) that spraying milky spore helps but it needs to be done for three years before you see good results. One is supposed to get better results with beneficial nematodes. You need to make sure that they have been refrigerated (they are living worms) so that they are viable and you need to get the variety that eats Japanese Beetle grubs. There are different nematodes that will go after flea eggs, etc., so make sure you get the right kind.

When I sprayed my yard earlier this year, I just used a simple water sprayer that attached to my hose in the garden. It worked great! So easy! I just made sure that the mixture was the right proportions of water to the nematode mixture and that I kept shaking the sprayer to make sure that the mixture stayed in solution. I also wet the area down before hand (the water sprayer worked great for that without the mixture) and then again afterwards (again using the water sprayer without the mixture). It was easy peasy lemon squeezy.
Avatar for Tisha
Jul 21, 2019 8:49 AM CST
(Zone 5b)
Bookworm The WITWIT Badge Moon Gardener Million Pollinator Garden Challenge Native Plants and Wildflowers Roses
Vermiculture Frogs and Toads Birds Lover of wildlife (Raccoon badge)
In a country environment, on an acre of my property ;
1. Applied milky spore years ago. Probably time to reapply?
2. Applied nematodes in spring for 3yrs.
Last year I found approx. two dozen beetles.
This year l removed buds as beetle time approached, leaving a few pretties for me.
Yesterday l found 6 beetles.
Some plts. have flowers open, the other plants are close to bursting open.

I live in the country. Lower property is wooded.
I have lots of wildflowers, possibly a distraction, food source.
Simple on a Schedule
Jul 22, 2019 7:22 AM CST
Long Island, New York, USA (Zone 7a)
Region: New York Roses
@mustbnuts, if they're anything like JBs then you have your hands full, too. Good to know the application was an easy process. Have you noticed a decrease in beetles? Sounds like a fall application is a good idea I might do the same.

@tisha, really great to hear you're seeing a decrease in the beetle population. Fair point re: wildflowers but if they're leaving your roses, etc. alone then I'd count that as a win!
Avatar for RpR
Jul 25, 2019 10:43 AM CST
Name: Dr. Demento Jr.
Minnesota (Zone 3b)
I have not seen a lot of Japanese Beetles up here for thirty years Hurray! Hurray! and never saw many at home.
I went home two weeks ago and couple of two gallon pails I had put swamp water, water that sat in the rain gutter pail and was like its name, had almost a dozen dead ones floating in them.
Went back last week and found one. Hurray! I tip my hat to you.
Jul 25, 2019 10:54 AM CST
Long Island, New York, USA (Zone 7a)
Region: New York Roses
Haha that's fantastic!
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