The Highway1 patch has been expanding over the years, but always produced relatively smaller berries until larger berries showed up on the east end in 1997. Sprayed when in full leaf, blueberry is very sensitive. Finally, for the solution strengths practical for lingonberry, sensitivity to Roundup varies in all plants with growth stage, and perhaps soil constituents and moisture. Roundup may be useful for encouraging volunteer American lingonberry, but many unknowns must be eliminated before firm conclusions arise. Blueberry elimination may be the immediate use for Roundup.
Some authorities pose two-percent organic matter as practical while others urge greater quantities.
Because overgrown fields have substantial organic matter in the root zone of existing plants, it is tempting to kill the plants with herbicide to use the soil with minimum disturbance of the organic-rich layer. This temptation held sway in management of four sites. A stripe of grass appeared on site 3B as an obvious miss in spraying. Planting of Europeans was completed on all sites by the third week of June, 1997. Drainage from the esker was the probable cause at 3A while poor drainage through clay was probable at 8.