Vermont State Horticultural Society. 37 



acetate and arsenite of soda (?) were dissolved in separate 

 earthenware jars. The former dissolves most readily in warm 

 water, about two quarts being used, and about one quart for the 

 latter. When completely dissolved the solutions were poured 

 together in the spray tank and water added to dilute it to the 

 proper volume. The main use made of the arsenite of kad (?) 

 was in spraying potatoes, and for this purpose it was com- 

 bined with the Bordeaux mixture. Used in the proportion 

 mentioned it proved as effective, if not more so, than 8 ounces 

 of paris green in the same volume of water and adhered to 

 the leaves much better. When used alone some milk of lime 

 .should be used to neutralize any excess of soluble arsenious 

 acid and also to make it more adhesive. 



Cost — The cost of the materials for a fifty gallon solution 

 is considerably greater than that of Paris green when pur- 

 chased in bulk. 



21 ozs. of lead acetate at iic per lb 14.4c 



4 ozs. of arsenite of soda (?) at 9c per lb. . . . 2.3c 



Total cost per 50 gallons 16.7c 



A paris green solution of the same volume would cost 

 somewhat less than half as much. When purchased in bulk;, 

 paris green can be obtained for from 14 to 15c per pound, 

 depending on the amount purchased. As a matter of economy 

 in first cost, the paris green is plainly the more economical to 

 use. Based on effectiveness, comparative immunity from injury 

 to foliage by burning, and greater adhesiveness, the arsenite 

 or arsenate of lead is to be commended as a valuable insecticide 

 for chewing insects. 



Use of fungicides and insecticides. Fungicides and insecti- 

 cides are used for the specific purpose of preventing or con- 

 trolling fungous or insect pests. In order, therefore, to use 

 them intelligently, some knowledge of the life history of the fun- 

 gus or insect is essential to its control or destruction. We must 

 know what kind of a fungicide or insecticide is most effective 

 against this or that pest, and at what particular time an appli- 

 cation may do the greatest harm to the fungus or insect, or 

 give the fullest protection to the plant treated. One appli- 

 cation at the proper time is worth a dozen at the wrong time. 



Success in the use of fungicides or insecticides may be said 

 to be dependent on the following factors (i) on their proper 

 preparation,, (2) in applying the most effective remedy at the 

 right time, (3) in the thoroughness of the application. The 

 writer is inclined to the belief that too little attention is ordin- 



