Posted by paul on July 09, 2010 at 21:31:22 from (66.44.132.76):
In Reply to: weeds in sweet corn posted by ric1 on July 09, 2010 at 09:07:49:
If you use herbicides, there are a few things to understand.
Some herbicides are real good at killing grassy weeds.
Some herbicides are real good at killing broadleaf weeds.
You typically need 2 different chrmicals, or one that is premixed together.
Some of the chemicals mentioned need to be sprayed before the corn comes up! And probably stired into the soil.
Some needs to be sprayed before the corn is 5 inches tall or so - while the corn's growing point is still below the ground; or else need to be sprayed carefully down low on the plant stalk, _not_ in the leaf whorls. These chemicals are the most common, but timing is everything. Wait too late and they will kill the corn as dead as they kill the weeds. Got to spray early with these.
A very few can be sprayed on taller corn.
Roundup kills most green things it touches; but it has no effect on the soil or long-term effects, does not kill seeds, etc. So if you use it on non-roundup ready corn, you need to wipe or spray the weeds only, without touching ant green corn plant with the spray. It's great for cleaning up bad patches of difficult weeds or out along the edges; but not really possible to use through the field. I don't think they have any roundup ready sweetcorn?
Anyhow, you have lots of good chemical suggestions here, but just be aware that it can be more complicated, and several of the things mentioned needed to be used long before you planted the corn, certainly not now any more.
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