40 MISC. PUB. 526, U. S. DEPT. OF AGRICULTURE 
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 from 1 to 114 
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 dicussion under the respective insecticides. 
Table 2 presents information concerning the quantities of some 
of 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, 
tablespoontfuls, 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 414 cups; or in case of 
1 gallon, use only 114 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. 
TABLE 1.—Approximate rates of application of insecticides to row crops (based 
on rows planted 3 feet apart)* 
SPRAYS 
For 100 feet | 1 gallon will 
Gallons per acre of row peta 
Quarts Feet of row 
(Osis So SE oe a ee ee ee See a Se ee ee 2 194 
LOO} 2 SS ae a a oo oe Sees os Sa me ee a ee een eee ee 3 145 
1 OES ee el ea ee Oe a eee er ee ee Re eee eer EeE 3% 116 
1 STD SS i ee a ae ae A a ee See a 4 97 
Dee a a rata Bs eh ES ee ee Er ee eee ne 5 83 
DOO ee 2 ee 3 eee Ss ee ee eee ee See 5% 73 
DUSTS 
- ; L pound wi 1 ounce will dust— 
es equired for} dust lengt 
SGYLTOS res BE 100 feet of row! of row indi- 
cated Length of row Area, 
Ounces Feet Feet Square feet 
1 9 ES fg ne prea ey ge en ial 1, 452 91 272 
i ee Ss oe ee ee ee Se ee eee eee BG 968 60 181 
A 9 PO oe Re se OT ee er ne a 74.9. 726 45 136 
7g aa a ceeh ee See a* SR  S SEN R e 8 Sp ee EN 2.8 581 36 109 
SQ ieee te Se ee eae er 3.3 484 30 91 
ee ee ee ee Se ene eo ees 3.8 415 26 78 
1 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. 
