Many of my organic gardening buddies use corn glutein for an organically approved pre emergent. I have not tried it myself but it is said to work on crabgrass. Crabgrass is an annual and comes back the following year from this year's seeds. Crabgrass is really bad here but mostly in our yards. I don't have it in my garden or compost pile.
You will still need to pull the grass this year but it should prevent the seeds from sprouting. I am not familiar with your growing season so I do not know when the seeds sprout there.
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