INSECTICIDES AND EQUIPMENT FOR CONTROLLING INSECTS 27 
PARIS GREEN 
Paris green is known chemically as copper acetoarsenite 
(Cu(C.H;0,)..3Cu(AsO,),). It was one of the first stomach poisons 
used in America for the destruction of leaf-eating insects. This mate- 
rial is a very poisonous, heavy, emerald-green powder, which for use 
as an insecticide should be finely ground, and should contain not less 
than 50 percent of total arsenious oxide and not more than 314 percent 
of water-soluble arsenious oxide. It is prepared and used both as a 
spray and as a dust for the control of chewing insects and in poisoned 
baits (see p. 28). 
Paris green is highly toxic to most insects but is also toxic to many 
plants and is rarely used on fruit trees. If used as a spray, constant 
agitation is necessary to keep it in suspension. One of its 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 larger 
quantities quantities 
IPArISh SCCM = 9 as ee te 2 teaspoonfuls. 2 pounds. 
Hydrated: lime@s2 22 eke be 4 tablespoonfuls. 8 pounds. 
ILO are = oe eR ee eae ee A 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 lime and is used for the 
control of cabbage caterpillars before the cabbage head begins 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 
ePRIGSOTCen 2 os Fr at ee 1 tablespoonful. 4 pounds. 
Brewar- sugars. = i 214 cups. 66 pounds. 
Water = ie ie2= 1 ealion: 100 gallons. 
To obtain best results with this spray, use a nozzle that produces a 
fine mist and apply only enough to form small droplets on the foliage. 
If more is apphed, 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 (CsH,NHC,H,S) is one of the new organic stomach 
poisons. Its use in veterinary medicine has eclipsed its status as a 
plant insecticide, but more work needs to be done on its insecticidal - 
