Garlic Mustard and Roundup

If you spray a plant with round up, does it kill any seeds that are developing or have developed? I am thinking in terms of Garlic mustard and do I have to spray before the seed pods develope.
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seeds last 3 years in the dirt. spray the plant before seeds develop (or just pull them up they are easy and then burn, dont compost) and then be sure to put down something will prevent germination in the area. Ingrid

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