When to bT corn silks?

ediej1209(5 N Central OH)July 28, 2014

I have never tried doing this before so I am not sure of the timing. When should I apply bT to the silks of the corn so we don't lose so many ears to those stinkin' ol' corn worms?
Thanks,
Edie

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wertach zone 7-B SC

Good question! I was about to post the same!

    Bookmark   July 28, 2014 at 12:15PM
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zeedman Zone 5 Wisconsin

I've applied it when silks first appear, and again a week later. There were virtually no earworms, none at all some years. Try to spray directly into hole where the silk emerges.

    Bookmark   July 28, 2014 at 11:42PM
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ediej1209(5 N Central OH)

Oh, dear, it looks I missed the window of opportunity then. Some of the ears, the silks are already starting to turn brown. Just have to keep my fingers crossed now. But thanks for the info - I will be better prepared next year!
Edie

    Bookmark   July 29, 2014 at 10:07AM
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wertach zone 7-B SC

Thanks Zeedman! Mine are a little past that stage but only by about 5 days.

    Bookmark   July 29, 2014 at 2:21PM
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fruitnut Z7 4500ft SW TX

I think BT pretty ineffective. I've sprayed every other evening with little success. In the evening because it photo degrades. And I started as soon as silks emerged. That amounts to about 10 applications. Ears were still heavily damaged. We have very severe pressure here.

    Bookmark   July 29, 2014 at 4:20PM
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Michael

I've had very good luck with just before pollen shed, immediately after and then once about 1 week to 10 days later. Don't use old Bt, for sure. I use a hand pump sprayer and shoot the liquid down into the tip with a low pressure stream. Bt does photodegrade quickly so putting it on the silks outside the ear won't help as much unless your ears are well protected by a dense canopy. Just for grins I tried a bicolor SHII triple stacked GMO, RR, Bt sweetcorn this year called Obsession II, out of 120 ears I had 2 with 1 tiny live worm each and never sprayed.

    Bookmark   July 30, 2014 at 2:08PM
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fruitnut Z7 4500ft SW TX

Ya, that BT works great when there aren't any ear worms...;-)

    Bookmark   July 30, 2014 at 11:33PM
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