6 BULLETIN 1228, U. S. DEPARTMENT OF AGRICULTURE. 
CONCLUSIONS REGARDING DUSTS. 
From the foregoing it appears that of the dusts derris powder is 
the most efficient, that pyrethrum is of much value, that naphthalene 
is efficient only in circumscribed areas where a good fumigation 
effect can be obtained, and that ground sabadilla seeds may prove 
efficient but require more thorough testing. 
PAINTS. 
Various preparations and substances have been tested as paints, 
applied with a brush. A dust consisting of naphthalene 23 per cent, 
phenols 0.6 per cent, coal-tar hydrocarbon oils 1 per cent, tobacco 
dust, and siliceous material was inefficient when mixed with water to 
form a thick paint and applied on an infested nest box. A prepara- 
tion containing coal-tar creosote oil 87 per cent (the remainder being 
water) was efficient when painted over the entire inside of a chicken 
house. Anthracene oil alone and also at the rate of 1 pound to a 
gallon of turpentine killed mites on roosts. Cresol in whitewash in 
a roost treatment was efficient at 5 per cent, but not at 2.5 per cent. 
Whitewash alone was inefficient. 
All efficient contact sprays are of value when applied as paints if 
the infested premises do not contain deep cracks (which harbor the 
mites) into which the liquid can not be forced with a paint brush as 
successfully as by the spray nozzle. While roosts can be painted 
without much trouble, it is more satisfactory to spray nest boxes, 
coops, and chicken houses. 
SPRAYS. 
In the tests with sprays the liquids were applied with a knapsack 
sprayer holding approximately 5 gallons, and a Bordeaux type of 
nozzle was used in most instances. In some cases where roosts or 
coops were treated a hand sprayer was used. 
SOLUTIONS OTHER THAN OILS. 
Spray tests with solutions other than oils are summarized in Table 
1. Some of the materials contained animal oils (whale oil), but 
none mineral oils. 
Table 1. — Results of spray materials {other than oils) against the chicken mite. 
Material. 
I'< ;• Ct ill. 
Ammonia water 28. no 
Alcohol.ethyl 95.00 
Formaldehyde 37.50 
Ferric sulphate r>v ><>, is]42.34 
Sodium hypochlorite '.'.u 
Sodium sulphur L3. ^7 
Do 12.45 
Lime-sulphur (32 8 B.)... 34.00 
Nicotine sulphates 41.82 
Do- 8.72 
Derriseztracl - L6.00 
Whale-oil soap 80.00 
Do 80.00 
Dilution in water. 
lto9 
None 
lto9 
1 to 9, 3 to 7 
None 
I to Iti 
1 to 8, 1 to 5 
I tO 15, I to 9 
i to600 
I to 75 
i to i.ooo, I to 500. 
i lb. to Lgal 
21bs.tq i gal 
1 •■ Available chlorine." 
- Whale-oil soap at the rate <>f t pounds 
Subject of test. 
Roost 
Roost and coop 
Chicken house, coop.. 
Roosts, nesl boxes.... 
Nest boxes 
Coops 
Roosts 
Chicken houses, nests. 
Chicken houses 
.:..do 
....do 
....do 
do. 
Results. 
Inefficient. 
Do. 
Somewhat efficient, 
inefficient. 
Do. 
Do. 
Do. 
Do. 
Somewhat efficient. 
Moderately efficient. 
Inefficient. 
Somewhat efficient. 
Do. 
LOOg iiions of water added. 
