Please house what kind of selective herbicide can I use in my 8 week casava? .the weed is the same level with casava and they are affecting them . Below is the pictures of the majority of the grass

There is also this grass called elephant grass too

It’s better you employ the services of a horticulturist or simply consider this nairalander product https://www.nairaland.com/7146273/weeding-made-easy-cost-effective

Ok tanks