5ltr Gallup Biograde WeedkillerGallup XL is a total weed killer. Once sprayed the active substance in Gallup XL enters the plant and is translocated throughout the leaves, stem and root system where it blocks important chemical processes and the plant goes into decline and dies. A period of at least 6 hours and preferably 24 hours free of rain must follow spraying. Do not spray onto weeds suffering from drought stress as reduced control may occur. Do not spray in windy conditions