Aspects of the ecology of Garlic Mustard, Alliaria Petiolata (BIEB) Cavara and Grande, in Ohio
Abstract (Summary)Garlic mustard, A l liaria petiolata (Bieb) Cavara and Grande, seed dormancy, competition effects, and spatial distribution and spread were studied in Ohio woods. Buried seed experiments lasting 3 yrs were begun in 1996 and 1997 to examine dormancy aspects of garlic mustard. Seeds were surface covered and buried 10 cm deep in fiberglass mesh packets. Average germination of shallow seeds was 61% the first season (1997) with a cumulative germination of 94% after 3 years. Among the deeply buried seeds, the cumulative germination was 16% after 3 years. No germination in the field was observed prior to February or after April of each season. Seeds were 100% viable at harvest and maintained 99% viability during the study. A competition experiment was begun in 1997. Garlic mustard seeds were planted into meter square plots of woodland herbs in the fall of 1997 at densities ranging from 0 to 6400 seeds rnT2 at two locations. Census of forest herbs taken during the experiment was used to calculate the Population Relative Growth Rate (PRGR) for each native species. Impatiens capensis PRGR at the highest density of garlic mustard was significantly reduced compared to the control at the Wooster site. There was no effect on other species. A mapping study was initiated in 1998 and continued through 2000 to quantify the spread of nascent foci in established woods. Plots were selected at three sites based on remoteness of small populations of garlic mustard rosettes. The area occupied by seedlings in 1999 was on average 53% to 170% greater than 1998 at the three sites. The area occupied by rosettes in 2000 increased by an average of 161% aver t h e first season (1998) at Wooster. The number of rosettes in 2000 w a s an average of 301% higher than the number of rosettes in 1998 a t Wooster and 588% greater at S. Charleston. Approximately 30% of 1999 seedlings survived to flower in 2000. Elimination of t h e s e nascent foci should be the primary goal for controlling garlic mustard.
School:The Ohio State University
School Location:USA - Ohio
Source Type:Master's Thesis
Date of Publication:01/01/2000