Round up

JCB · Oct 12, 2009

I have an old alfalfa field that I would like to spray with Round up before I plow it down. We have had a hard freeze and then two 1" snow falls already and the alfalfa is going dorment. My question is if the snow melts and grass and alfalfa dry off, will spraying with Round up be effective?

Fergienewbee · Oct 12, 2009

Don't know about alfalfa,but as I understand it, plants have to be growing for RU to work. Fall spraying is supposed to be better than spring. I have some quack grass I hope to spray this week. We've had a couple of hard frosts, but the grass is still green. Just waiting for a day or two with no rain forecast.

Larry in Michigan

James Howell · Oct 12, 2009

To be effective, RU has to be "ingested" by the plant leaves/foliage. Once "ingested" it is transported to the plant roots, which RU kills causing the plant to die. If the plant is not active or growing, the RU will not be effective.

RU is best used on a warm, sunny day when plants will be "active".

Pair-a-dice farm · Oct 12, 2009

As others have said, whatever you are spraying has to be growing in order for roundup to be effective. I spray roundup on my bermuda grass in February to kill the early weeds and fescue.

Bill(Wis) · Oct 12, 2009

2-4D is a lot less expensive than glyphosate (Round Up) and it'll kill alfalfa just as dead. But it has to be growing.

Round up

JCB

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Fergienewbee

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James Howell

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Pair-a-dice farm

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Bill(Wis)

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