Wetland plant responses to varying degrees of purple loosestrife removal in southeastern Ontario, Canada / T. Shane Gabor, Tip Haagsma, and Henry R. Murkin.

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Gabor T. Shane

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Material type: Text

TextSeries: Wetlands. 16(1) 95-98 Publication details: 1996.Description: illustrations ; 28 cmLOC classification:

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Summary: This study examined the response of native vegetation to varying levels of purple loosestrife (Lyrhrum salicaria) removal and determined its impact on subsequent loosestrife germination and establishment in a southern Ontario wetland during 1993 and 1994. The study site was treated in 1991 with varying dosages of triclopyr amine herbicide, the triethylarnine salt formulation of triclopyr [[(3,4,6-trichloro-2- pyridiny1)oxyl acetic acid]; 4.0, 8.0, and 12.0 kg active ingredient (a.i.)/ha. Different levels of adult loosestrife control were achieved. The lowest density of adult loosestrife was observed in the 8.0 and 12.0 kg ailha treatment plots where root kill was most effective. Most new adult loosestrife plants in the 8.0 and 12.0 kg a.i./ha treatment plots established from seed. The highest densities of loosestrife seedlings and grass (Gramineae) species were observed in the treatment plots with the lowest number of adult loosestrife plants (12.0 kg adha). Sedge species (Carex spp.) did not differ between treatment levels during 1993 and 1994. Loosestrife seedling densities decreased from 1993 to 1994, suggesting that increased native plant species can slow the rate of loosestrife reestablishment from the seed bank. Native vegetation seems to replace adult loosestrife for a limited time following herbicide application; however, without subsequent treatment, loosestrife will slowly reinvade a wetland.

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Includes bibliographical references (page 98).

This study examined the response of native vegetation to varying levels of purple loosestrife
(Lyrhrum salicaria) removal and determined its impact on subsequent loosestrife germination and establishment
in a southern Ontario wetland during 1993 and 1994. The study site was treated in 1991 with varying
dosages of triclopyr amine herbicide, the triethylarnine salt formulation of triclopyr [[(3,4,6-trichloro-2-
pyridiny1)oxyl acetic acid]; 4.0, 8.0, and 12.0 kg active ingredient (a.i.)/ha. Different levels of adult loosestrife
control were achieved. The lowest density of adult loosestrife was observed in the 8.0 and 12.0 kg
ailha treatment plots where root kill was most effective. Most new adult loosestrife plants in the 8.0 and
12.0 kg a.i./ha treatment plots established from seed. The highest densities of loosestrife seedlings and grass
(Gramineae) species were observed in the treatment plots with the lowest number of adult loosestrife plants
(12.0 kg adha). Sedge species (Carex spp.) did not differ between treatment levels during 1993 and 1994.
Loosestrife seedling densities decreased from 1993 to 1994, suggesting that increased native plant species
can slow the rate of loosestrife reestablishment from the seed bank. Native vegetation seems to replace adult
loosestrife for a limited time following herbicide application; however, without subsequent treatment, loosestrife
will slowly reinvade a wetland.

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