Abstract
Isopropyl- m-chlorocarbanilate (chlorpropham), chlorpropham plus p-chlorophenyl- N-methylcarbamate (PPG-124), S-ethyl dipropylthiocarbamate (EPTC), N, N-dimethyl-2,2-diphenylacetamide (diphenamid) and 2,6-dichlorobenzonitrile (dichlobenil) were evaluated for plant tolerance and weed control when incorporated on milled pine bark mulch and applied at a depth of 1.27 cm to five species of container-grown nursery stock. During two seasons, all impregnated mulches except EPTC at 5.6 kg/ha and diphenamid at 5.6 kg/ha provided adequate long-season broadleaf weed control. Similarly, long-season grass weed control was acceptable with all herbicide-impregnated mulches except chlorpropham at 2.2 kg/ha, chlorpropham plus PPG-124 at 2.2 plus 0.4 kg/ha and diphenamid at 5.6 kg/ha. Plant injury appeared on all five species of nursery stock when dichlobenil was impregnated on pine bark mulch at a rate of 13.4 kg/ha.
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