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Old 04-06-2012, 04:47 PM
 
Location: SW MO
1,238 posts, read 4,104,767 times
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Every year it is a fight to keep the Japanese beetles from consuming the leaves on my Thompson grape vine. Is there anything I can do NOW to avoid the damage later? Where do they come from and can I break their egg-laying cycle so there aren't so many next year?
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Old 04-06-2012, 04:59 PM
 
Location: Former LI'er Now Rehoboth Beach, DE
8,578 posts, read 11,478,266 times
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Have you had problems with grubs? I find the years I have grubs the following year the JB are just awful. So I have started to put grub control down and that seems to have helped quite a bit but not 100%.
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Old 04-06-2012, 05:45 PM
 
Location: ๏̯͡๏﴿ Gwinnett-That's a Civil Matter-County
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Quote:
Originally Posted by nuts2uiam View Post
Have you had problems with grubs? I find the years I have grubs the following year the JB are just awful.
The grubs you're seeing are most likely the JBs in their immature "white grub" stage
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Old 04-06-2012, 05:48 PM
 
Location: ๏̯͡๏﴿ Gwinnett-That's a Civil Matter-County
2,117 posts, read 5,507,417 times
Reputation: 3518
Some of the pro concentrates of permethrin or bifenthrin should help but I don't know if you'd want that stuff on something you plan to consume.

I use a trunk spray on some of my ornamentals but wouldn't use them on fruit trees but that's me.
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Old 04-06-2012, 06:04 PM
 
4,740 posts, read 9,072,112 times
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Try a grub control like Scott's GrubEx now (can apply in Spring) to kill Japanese beetle larva before they hatch. However, note that the soon-to-hatch grubs are tougher to kill than if you get them young. The best time to apply grub-icide is late Summer after the adults have spawned their devilish offspring.

I use Milky Spore to kill grubs - it is a natural bacterium that works well.
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