|POPPE, STEVEN - UNIVERSITY OF MINNESOTA
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 8/15/1998
Publication Date: N/A
Technical Abstract: Canola (Brassica napus) is known to produce high levels of glucosinolates. As canola tissues die, these compounds are converted to isothiocyanates, which are toxic to many crop pests. We tested the ability of 'Jupiter' canola, purposefully killed by simulated mowing or glyphosate application, to inhibit green foxtail (Setaria viridis) and redroot pigweed (Amaranthus retroflexus) seed germination and seedling growth during establishment of 'Glooscap' strawberry (Fragaria americana) in two identical experiments. Although mown canola had enough shoot material to completely cover the soil surface, it had little effect on weed growth compared to untreated weedy checks. In contrast, canola treated with glyphosate nearly eliminated weeds from strawberries. In this treatment glyphosate was applied before strawberry transplantation and weed seed germination. Thus, glyphosate had no direct effect on weed control. This same treatment also stunted strawberry plants somewhat, but the crop eventually overcame this initial suppression. In conclusion, a glyphosate-treated canola mulch may be a new use for canola by providing a possible short-term replacement for soil fumigants, such as methyl bromide, during strawberry establishment.