40 



MISC. PUB. 52 6, U. S. DEPT. OF AGRICULTUEE 



mixture as indicated for sprays. For example, in the case of the 

 Mexican bean beetle the derris or cube dust mixture is applied at a 

 rate of 20 to 25 pounds per acre. For small gardens a little over 2 

 ounces is required to treat 50 feet of row crop for each application. 



In most cases the standard dilution at which the spray is employed 

 is given in the discussion under the respective insecticides. 



Table 2 presents information concerning the quantites of some 

 of the the common insecticidal materials that should be used in pre- 

 paring 1 and 3 gallons on the basis of the standard dilutions normally 

 employed. 



As an additional aid, especially to the home gardener who may 

 not have scales available for weighing out the material, informa- 

 tion is given in table 3 in regard to volume, expressed in teaspoonfuls, 

 tablespoonfuls, or cupfuls, of given weights of insecticidal materials 

 that are used in making up small quantities of the commonly used 

 sprays or dusts. For example, if the recommendation is for 1 pound 

 of lead arsenate per 50 gallons of water, use 2% cups; or in case of 

 1 gallon, use only 2y 2 tablespoonfuls. 



Table 4 contains a series of tables of liquid and dry measures and 

 equivalents that should be helpful in preparing insecticides when 

 dilutions by parts are given and also when it is desired to prepare 

 various quantities of spray ranging from 1 to 100 gallons. 



Takle 1. — Approximate rates of application of insecticides to row crops (based 

 on rows planted 3 feet apart) 1 



SPRAYS 



Rate per acre (gallons) 



For 100 feet 

 of row 



1 gallon will 

 cover — 



75 - 



Quarts 

 2 

 3 



3^ 



4 

 5 



Feet of row 

 194 



100. 



145 



125 



116 



150. 



97 



175 - 



83 



200 - 



73 







DUSTS 



Rate per acre (pounds) 



Required for 

 100 feet of row 



1 pound will 

 dust length 

 of row indi- 

 cated 



1 ounce will dust — 



Length of row 



Area 



10 



Ounces 



1.1 

 1.6 

 2.2 

 2.8 

 3.3 

 3.8 



Feet 

 1,452 

 968 

 726 

 581 

 484 

 415 



Feet 



91 

 60 

 45 

 36 

 30 

 26 



Square feet 

 272 



15 . 



181 



20 



136 



25 



109 



30 



91 



35 -. 



78 







i Application rates for fruit trees, small fruits, and shrubs vary considerably with the size of the plants, 

 the density of the foliage, the time of the season, and the insects involved. Apple trees 2 or 3 years old 

 may require only about 1 gallon; mature trees of large size may require more than 50 gallons. 



