Abstract
The granular formulation of pendimethalin (Southern Weedgrass Control) safely provides preemergent control of grasses and broadleaf weeds in a variety of landscape ornamentals but few annuals. The purpose of this experiment was to evaluate phytotoxicity of pendimethalin to several annual species under landscape conditions. Pendimethalin at 1.7, 2.2, 2.8, or 3.4 kg ai/ha was applied over-the-top to cool and warm season annuals in a simulated landscape at 4-month intervals starting 15 October 1990. The simulated landscape was divided into 4 blocks (reps) with pendimethalin levels as the main plot factor and annual species as the subplot factor. Unweeded and hand-weeded plots served as controls. Irrigation (over-the-top) and insecticides were applied on an as-needed basis. All annuals except `Sonnet Burgundy' snapdragon exhibited some degree of stunting. `Vodka' wax begonia was the most sensitive to pendimethalin as it was moderately stunted at all rates. Weed control generally was good to excellent.
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