Basically it means how the herbicide kills the targeted weed at the cellular level - not all pesticides are designed to kill the target pest in the same way. Often time one likes to use pesticides with different modes of action so that the pest organisms don’t develop resistance to the pesticide - this is particularly true of insecticides.

But to answer your question on a second application of pre-emergent I don’t think you need to do this this year - just hold off and don’t make another Prodiamine application until your late winter/early spring application in early/mid Feb, but if you find certain winter weeds escaped your recent Sept Prodiamine application, then come back on the board so that those weeds can be identified and then perhaps some on the this board might recommend an a second application of pre-emergent with a different mode of action, for example, simazine, next Nov.

BTW, are you getting on top of that Dallisgrass issue?

This post was edited on 10/3/20 at 10:27 am

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Posted by oOoLsUtIgErSoOo

Louisiana

Member since Aug 2006

26411 posts

Posted on 10/3/20 at 9:25 am to CrawDude

quote:
BTW, are you getting on top of that Dallisgrass issue?

No. It's still there, except for my round up and digging I did once. I saw some, what I think is, clover starting to pop up already, so I hit that with MSM. From what I can find, I'm out of options with the Dallis grass unless I keep killing and digging.

I even went to my local feed store. They have been super helpful so far. They suggested sledgehammer, but said I would have to really stay on top of it with even that. Likely that it would just suppress it and it would continue coming back.

This post was edited on 10/3/20 at 9:27 am

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