you can treat whole yrd with liquid 2-4d but beware that it will kill shrubs and trees if wind catches it or it gets on roots..... your best bet is Scotts weed and feed applied right now and then do it again in about a month. Scotts will kill the biggest part of your weeds and also fertlize grass so it will get healthy and choke out weeds but you will need to fertilize with triple 13 or triple 16 this summer to help it get healthier.
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