,n;.iv(' satisfactory poison ivy control. The effectiveness of these herb- 

 icides for poison ivy control under trees of Melntosli liarvest season 

 and later would be dependent on the earJ iness and severity of frost and 

 its effect on the poison ivy foliage. 



*************** 



POMOLOGICAL PARAGRAPH 



Double Headinja; - Double heading of apple trees the year of planting 

 appears to be gaining grower acceptance. One method of double heading 

 is to prune the one-year-old whips 4-5 inches higher than desired at 

 time of planting. Wlien the top-most shoots are 1 to 6 inches long (gen- 

 erally in early June), the leader is cut back an additional 4 or 5 inches. 

 This will eliminate limbs with sharp crotch angles in the upper part of 

 the tree and force out more wide-angled side branches. 



Some growers prefer to head the one-year-old whip to the desired 

 height at planting. Then after the top-most shoots on the leader are 

 I+-6 inches long, all are removed except for the one most suitable for 

 the leader. 



*************** 



HOW PESTICIDES ARE NAMED 



E. H. Wheeler, Professor of Entomology 

 Department of Entomology and Plant Pathology 



Carbaryl is the common or generic name now being widely used for 

 Sevin insecticide. Carbaryl will be used to designate this particular 

 active ingredient on labels. Many growers who are seeing the new term, 

 carbaryl, listed in state recommendations for insecticide treatments 

 may wonder what this name means. By knowing this, mistakes may be avoided. 



The common' name for Sevin has been accepted by the International 

 Organization for Standardization, the American Standards Association 

 and the British Standards Institution. 



Common names are adopted to clarify and standardize the nomencla- 

 ture of a product throughout the world. Governmental and scientific - 

 groups can more readily use a generic or common name of a material in 

 recommendations and corrununications without sponsoring or favoring a par- 

 ticular trade-marked brand name. 



Why carbaryl? Sevin insecticide can be described chemically as a 

 carbamate compound or an aryl urethane. Dr. Maurie Semel, of the New 

 York Vegetable Research Station, Long Island, suggested combining the 

 terms carbamate and aryl into "carbaryl" as a descriptive common name. 



