Vol. 15—1961 - NorthEastern Weed Science Society

552.
The barge was run at ~ speed of ~ mph with the seeder
hoppers open to #11 setting. At this speed and setting the time
• ') distribute 100 pounds of 20% formulation over one acre was
1..,10 mf.nutes and fifty seconds. The swath of the two seeders was
:cuout thirty feet using AmchemAqua-Kleer granules 8-15 mesh,
• ~nd about twenty feet with the 20-40 mesh granular material. Tabl~
I presents,s9me additional calibrations.
1/ Table I. Calibrations for the Gerber Seeder
Active
Boat sleed Mesh-size Hopper Ingredient Time to
_(MPH of Granule setting Lbs. % distribute
8. 8-15 11 100 20 2 min. 50 sec.
4. 8-15 12 200 10 5 min. 38 sec.
6.6 20-40 10 100 20 2 min. 44 sec.
Note: Based on two Gerber seeders using Amchemgranules.
A crew of three men was reqUired on the barge, the operator
plus two men to feed the hoppers. A fourth man was stationed on
shore to direct the course of the barge. A flat-bottom, square-bow,
sixteen foot aluminum boat was used to treat the shallow areas not
Qffected by the freeze. It was powered by a 10 HP outboard motor
and had one seeder mounted on the bow.
The application of chemicals was started the 19th of May,
but full-scale applications did not get under way until early June.
The milfoil was treated in all developmental stages from vegetative
sprout growth to near maturation.
Plots that could be treated in one day's work Vlere marked
with 16 foot, 1" x 2" poles topped with colored flags. Styrofoam
• buoys anchored with sash weights were used where hard bottom conditions
existed. These markers were placed on the 7 and 14 foot
contour at thirty-foot intervals when the 8-15 mesh granules were
used, and at twenty-foot intervals when using the 20-40 mesh
granules. The swath of the seeders using different size granules
controlled the placement of the markers.
It had been assumed that the diffusion of the chemicals was
only five to ten feet, thus keeping the barge on a course sufficien~
ly true to remain within this margin of tolerance proved to be a
seri ous obstacle. The final sol uti on was to' use' t\;O ,..r.1.1kie-t:"lkie