INSECTICIDES AND EQUIPMENT FOR CONTROLLING INSECTS 27 



PARIS GREEN 



Paris green is known chemically as copper acetoarsenite 

 (Cu(C2H 3 2 )'2.3Cu(As0 2 ) 2 ). It was one of the first stomach poi 

 used in America for the destruction of leaf-eating insects. This mate- 

 rial is a very poisonous, heavy, emerald-green powder, which for 



as an insecticide should be finely ground, and should contain not 

 than 50 percent of total arsenious oxide and not more than V f 2 percent 



of water-soluble arsenious oxide. It i- prepared and used both as a 

 spray and as a dust for the control of chewing insect- and in poisoned 



baits ( see pane 28). 



Paris green is highly toxic to most insects but is also toxie to many 

 plants and is rarely used on fruit trees. If used a- a spray, constant 

 agitation is necessary to keep it in suspension. One of it- chief uses 



as a spray is for the control of the Colorado potato beetle, combined 

 with bordeaux mixture. 



For a spray use the following formula : 



For small For largt r 



quantities quantities 



Paris green 2 teaspoonfuls. 2 pounds. 



Hydrated lime 4 ralilespoonfnls. 8 pounds. 



Water__ 1 gallon. 100 gallons. 



The lime is added to the spray to combine with the soluble arsenic in 

 the paris green and thus reduce plant injury. 



As a dust it is mixed with a carrier such as talc or lime an* I is used 

 for the control of cabbage "worms'' before the cabbage head begin- 

 to form. It is also used on tobacco in some areas to control hornworms 

 and flea beetles. 



Before the development of the tartar emetic and brown sugar com- 

 bination for the control of the gladiolus thrips. paris green was recom- 

 mended and used for this pest: however, some foliage injury usually 

 followed such use. 



To prepare a spray for gladiolus thrips use: 



For small For larger 



quantities quantities 



Paris green 1 tablespoonful. 4 pounds. 



Brown sugar 2% cups. 66 pounds. 



Water. lgallon. lOOgallons. 



To obtain best results with this .-pray, use a nozzle that produces a 

 fine mist and apply only enough to form small droplet- on the foliage. 

 If more is applied, the droplets coalesce and run to the base of the 

 plant, causing waste and plant injury. 



Caution. — Paris green is extremely poisonous and therefore 

 should be kept in a safe place, away from foods. Tight con- 

 tainers plainly labeled and marked "Poison" should be used for 

 storing the material. Paris green or its dust mixtures should not 

 be inhaled. The skin, and especially open wounds, should be pro- 

 tected from this compound, or serious poisoning may result. 



PHENOTHIAZINE 



Phenothiazine (CM ; XIU \ 11 ,S) is one of the new organic stomach 

 poisons. Its use in veterinary medicine has eclipsed it- -tain- as a 

 plant insecticide, but more work needs to be done on its insecticidal 



