4305 BRIGHTON BOULEVARD -:- DENVER, COLORADO 3 
AERO CYANATE WEEDKILLER 
FOR WEED CONTROL IN ONIONS 
IN 
AERO Cyanate, Weedkiller sprays have given excellent control of weeds that appear after 
onions emerge. Post-emergence Cyanate spray applications kill most annual weeds when they are 
small. There are no soil toxicity hazards because, on contact with the soil, Cyanate breaks down 
rapidly to form potassium bicarbonate and ammonia—both compounds are fertilizer materials. 
Always apply Cyanate when the weeds are small. Start spraying when the oldest broadleat 
weeds present have only two true leaves, and the oldest grass seedlings present have only one blade 
which is not more than one-half inch long. Weeds make very rapid growth after come-up, which 
means that spraying should start just after a crop of weeds appears. Start early, to make certain 
that all of your crop will be sprayed before any of the broadleaf weeds have more than three or 
four true leaves; at this late stage they are too hard to kill. Spray applications must be repeated 
soon after a new crop of weeds appears. Depending upon the number of weed seeds in the soil, 
kinds of weeds and weather conditions for germination, growers have found that from three to 
five Cyanate sprays are required to control weeds to harvest time. 
AERO Cyanate spray should always be applied when the weeds are dry; do not make appli- 
cations when the weeds are wet with dew or rain. Best results are obtained if the application is 
followed by several hours of dry clear weather. 
IN 
ADVANTAGES OF AERO CYANATE WEEDKILLER 
® Relatively non-toxic to man or ® Does not stain clothing, equipment, 
animals or vegetation 
* No poison residue remains on crop * No fire hazard 
® Does not poison the soil ® Very soluble in water 
® Is not translocated in plants ® Non-corrosive to equipment 
* Active ingredients non-volatile ® Easy and economical to apply 
© No danger from drift ® Very stable in closed container 
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