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When to bT corn silks?

Posted by ediej1209 5 N Central OH (My Page) on
Mon, Jul 28, 14 at 10:19

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


Follow-Up Postings:

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RE: When to bT corn silks?

Good question! I was about to post the same!


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RE: When to bT corn silks?

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.


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RE: When to bT corn silks?

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


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RE: When to bT corn silks?

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


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RE: When to bT corn silks?

  • Posted by fruitnut z7b-8a,4500ft SW TX (My Page) on
    Tue, Jul 29, 14 at 16:20

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.


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RE: When to bT corn silks?

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.


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RE: When to bT corn silks?

  • Posted by fruitnut z7b-8a,4500ft SW TX (My Page) on
    Wed, Jul 30, 14 at 23:33

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


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