INSECTICIDES A2sD EQUIPMENT FOR CONTROLLING INSECTS 3J 



Liquid extracts containing the active ingredients are also available, 

 but certain of these may lose some of their effectiveness when mixed 

 with water. The derris and cube insecticides are sold under various 

 trade names: but since the strength of the active ingredients may vary 



in the different brands, they should be used as directed by the 

 manufacturer. 



The more important uses, on vegetables, flowers, and fruits, of rote- 

 none root powder are to control the Mexican bean beetle cabbage 

 caterpillar?, cucumber beetles, the pea aphid, the pea weevil, the 

 asparagus beetle, flea beetles, the cherry fruitfly, the currant worm, 

 rose slugs, the Japanese beetle, spittle bugs on strawberries, and the 

 iris thrips. 



Dusts and sprays are mixed on the basis of rotenone content. A 

 dust usually should contain at least 0.5 percent. To mix a 0.5-percent 

 dust, use lSio pounds of the rotenone root powder containing 4 percent 

 of rotenone and S7y 2 pounds of talc, sulfur, or other diluent. If the 

 root powder contains 5 percent of rotenone. use 10 pounds of it and 

 90 pounds of the diluent. For smaller quantities, weigh by ounces 

 instead of pounds. 



To prepare a spray for bean beetle control, use 3% pounds of 

 rotenone root which contains 4 percent of rotenone, or 2% pounds of 

 rotenone root which contains 5 percent of rotenone. to 100 gallons of 

 water. For smaller quantities use 1 ounce of 4-percent powder to 

 2 gallons or 1 ounce of 5-percent powder to 2y 2 gallons. This mix- 

 ture will contain approximately 0.015 percent of rotenone. 



A spray mixture consisting of derris powder, pyrethrum extract, 

 and sulfonated castor oil with water has been found effective against 

 red spiders, thrips (except the gladiolus thrips) on certain flowering 

 plants, the cyclamen mite on chrysanthemums, aphids. cucumber 

 beetles, tarnished plant bugs, certain species of leaf rollers, and leaf 

 tiers. The spray is made up according to the following formula : 



For small Forlarfje 



quantities quantities 



Rotenone-containing root powder 

 (containing 4 percent of 



rotenone) 1 tablespoonful. 1 pound. 



Pyrethrum extract (alcoholic ex- 

 tract, containing 2 percent of 



pyrethrins) 4 teaspoonfuls. 2 quarts. 



Sulfonated' castor oil 2 teaspoonfuls. 1 quart. 



Water 1 gallon. 50 gallons. 



In preparing this spray, add the sulfonated castor oil to the water. 

 Next add a small quantity of this oil-and-water mixture to the derris 

 or cube powder to make a uniform paste. Then stir the paste slowly 

 into the remainder of the oil-and-water mixture. Finally add the 

 pyrethrum extract to this mixture in case it is intended for the control 

 of thrips or the cyclamen mite. For either red spiders or whiteflies, the 

 pyrethrum may be omitted. A proprietary spreader-sticker, such as 

 sodium oleyl sulfate plus synthetic resinous Base, may be substituted for 

 the sulfonated castor oil in the above formula, since the oil may at 

 times injure the petals of open flowers and also the foliage ^^( some 

 plants. This material is used at the rate of % teaspoonful per gallon. 

 or V/ 2 pints per 100 gallons, of spray mixture. 



5355!':: 4;: — 3 



