In my experience with them when you treat for grubs you save your lawn and reduce overall population. But yea you'll probably still need to treat your plants that they go after. Kill them all...they're invasive.Phids said:I noticed a bunch of Japanese Beetles congregating on my baby apple tree which is still in a container, and they would have killed the thing if I hadn't noticed in time. While I have knocked them off physically and with some neem oil, I have seen more of these flying around the yard.
I have read that these beetles are only active for about a month of the year, and you can prevent some by treating your lawn for grubs. However, will that even make a difference considering that I live in a standard subdivision with yards so close together? Is it better to just treat them when I see them rather than try to prevent them since they'll be around anyway?
Thanks. I may treat for grubs to try to reduce them, but the problem is that my yard is in the middle of a block with a lot of other yards, and unless everyone kills them, my efforts might not amount to much.SodFace said:In my experience with them when you treat for grubs you save your lawn and reduce overall population. But yea you'll probably still need to treat your plants that they go after. Kill them all...they're invasive.
This year? Not much. Water spray or maybe a BB gun. FWIW, YMMV but, We found traps useless for anything other than attracting the beetles over into our yard from neighboring properties.Budstl said:I have beetles eating my japanese maple. What can i use to kill/control them?
I use Bifenthrin - already have it for mosquitos and such. Looks like you're in the US so your hardware store probably has some stuff that'll kill them. Online you can get "professional" grade stuff which is higher concentration. I get Bifen I/T and it mixes 0.6-1oz of chemical to 1 gallon water. Read label/watch some YouTube or whatever but avoid food plants(duh) and flowers(don't kill the bees).Phids said:Thanks. I may treat for grubs to try to reduce them, but the problem is that my yard is in the middle of a block with a lot of other yards, and unless everyone kills them, my efforts might not amount to much.SodFace said:In my experience with them when you treat for grubs you save your lawn and reduce overall population. But yea you'll probably still need to treat your plants that they go after. Kill them all...they're invasive.
I did try some neem oil spray on my apple tree, but from what I understand that only stops the beetle's ability to reproduce in the future. I also tried some bacillus thuringiensis spray, but that didn't seem to keep them off the leaves.
In the end, I set up a few Japanese Beetle traps that I got at Walmart. After setting out my first trap I noticed I caught over 100 beetles in it in a matter of days.
Circling back to this thread as ^that^ precise dilemma came to mind as I just finished sweeping DEAD Jap Beetles off the front walk - which had flown over from neighboring tracts …Phids said:… the problem is that my yard is in the middle of a block with a lot of other yards, and unless everyone kills them, my efforts might not amount to much. …
I am south of Atlanta as well and so I am glad to hear you say that this year is unusually heavy in Japanese Beetle activity. I never noticed them in the past so perhaps 2022 is just an outlier year.absabalu said:My two year old Natchez crepe is under attack by Japanese beetles. I have been drowning them 2-3 times daily and their numbers were growing. Last evening I sprayed the crepe with neem oil and seem to have less today. I have lived in this home for 31+ years and have never had this problem. My concern is JB grubs might attack my lawn. Have never had a grub problem. No preventive has ever been applied to lawn. Should I go ahead and put a grub preventive down now or wait and see if there is a grub problem this fall? Thanks for your help.
absabalu said:…Should I …wait and see …?
I am no entomologist but, in all I've learned about them, Japanese Beetles aren't "like locusts" … I would be thrilled to be wrong but, my prediction is now you got 'em, you're gonna have 'em from now on … and once we got 'em I am sure I can't think of anytime where "they're not as bad as last year or two years ago" ever got us anywhere even approaching a number that was acceptable to our landscape plants …Phids said:… I never noticed them in the past so perhaps 2022 is just an outlier year. …
440mag said:… our THREE-pronged program / plan-of-action has resulted in pretty much 98+% removal and what few fly over from other properties succumb immediately to # 3
(Note: I have an annual JAN / FEB reminder in my phone so I order # 3 and start looking for # 2 on store shelves to avoid any low inventory issues and to ensure I have the products actually on-hand when I need them and can cherry pick good weather / pre-rain days to apply them.)
1. We applied milky disease spore back in 2015 - just once - and which I remain speechless and flabbergasted to still see statements such as "no scientific proof" it works etc as I have yet to see it not work even in instances where friends family and neighbors did nothing but apply milky disease spore (I.e., they opt to not use grub preventative / curative chemicals OR tree / shrub drench)!
2. Each April/May we apply a grub preventative annually (actually this is more to prevent any more extensive and "roto-tiller-type" damage by turkeys skunks and other residents which preceded us, flipping the turf over because they smell any hint of any type of larvae under our grass)
3. Each March/April we apply *LIQUID* Imidacloprid as a root drench at the base of any trees or shrubs which ever attracted Jap Beetles. Simply mix the correct # of ounces of product into one or two gallons of water and slowly pour around the base or trunk - the plant takes the active ingredient up into its system and Jap Beetles are literally DOA / DRT as soon as they pierce / bite into the plant! :thumbup:
Now ^that^ is a most excellent question! And, "I DO NOT KNOW" for sure but, it seems intuitive to me that based on the way Milky Disease spore spreads the more hosts the better!absabalu said:… I read about milky spore a few days ago. And think this is the way to go. Am I correct that this fall I should not apply any preventive/ corrective measures if grub activity is present so the milky spore bacteria can "feast" on any JB grubs and multiply? …
absabalu said:… And do you believe the root drench would be beneficial now that the invasion is waning?
Yes. Unless you have other insects to worry about (I.e., bagworms on Leyland Cypress +/or arborvitae, etc,) I'd hold off on the root drench until next (EARLY!) spring