dichlobenil (Casoron 4G)
Rate 4 to 6 lb ai/a (100 to 150 lb/a Casoron)
Time Apply to mineral soil and incorporate 4 to 6 inches deep before placing containers on treated area.
Remarks Consult label for listed crops. Inhibits cell wall production.
Caution Do not transplant into treated soil. Do not use in greenhouses; volatility of dichlobenil may injure nearby plants.
Site of action Group 20: inhibits cell wall synthesis Site A
Chemical family Nitrile
dimethenamid-P (Tower)
Rate 0.98 to 1.5 lb ai/a (21 to 32 fl oz/a) depending on weed control needed
Time Before container placement
Remarks Apply to bareground pad such as soil, mulch, gravel, wood chips, or other permeable base. Requires 0.5 inch of water or more after application to activate herbicide.
Caution Do not apply in greenhouses, polyhouses, or other fully enclosed greenhouse-type structures.
Site of action Group 15: inhibits very long chain fatty acid synthesis
Chemical family chloroacetamide
pendimethalin (Pendulum Aquacap or 2G)
Rate 2.1 to 4.2 quarts/a Aquacap; 100 to 200 lb/a 2G.
Time Before setting pots and when other vegetation has been removed.
Remarks Will not control emerged weeds but will slow emergence if applied after weed seeds have germinated.
Site of action Group 3: microtubule assembly inhibitor
Chemical family Dinitroaniline
prodiamine (Barricade FL)
Rate 0.65 to 1.5 lb ai/a (21 to 48 fl oz/a Barricade 4L)
Time Apply to soil, gravel, or other permeable surface before placing containers.
Caution Minimize disturbance during hand-weeding to maintain herbicide layer. Apply in fall or spring before weeds germinate.
Site of action Group 3: microtubule assembly inhibitor
Chemical family Dinitroaniline