Vol. 15—1961 - NorthEastern Weed Science Society

279.
following application. The high dosage of 120 lbs. of actual chlordane per
acre, applied early post-emer5cnce, did not injure the established turf, although,
as expected, poor control of crabgrass resulted.
"Pax" caused an early flush of growth due to the fertilizer ingredient but
also failed to control crabgrass satisfactorily. It must be noted that due to
a calibration error, "Pax" was applied at approximately 87 lbs./A. less than
the dosage suggested on the bag. This represents an 11% error which could have
affected the results. Watering following application did not appear to influence
the results. The turf grasses appeared unaffected by Ilpax."
Preliminary trials were conducted with several pre-emergence herbicides
to control cr~grass in tt!-l't. Under the condi tiona of these experiments none
of the materials, including chlordane, "Pax," zytron, dacthal or calcium
arsenate, was satisfactor.Y' for immediate use on a mid-spring seeding of turf
grasses. On established turf, however, zytron, dacthal and calcium arsenate
provided better than 9.5%control of crabgrass without injuring the turf.
Chlordane and "Pax" failed to control crabgrass satisfactorily.