INDEX. 43 
Page. 
Nozzles for spraying against hop aphis 33 
Phorodon humid i. (See Aphis, hop.) 
Picking off infested leaves as remedy against hop aphis 37 
Picrsena excelsa. (See Quassia.) 
Plum, winter host plant of hop aphis 14 
Prune, winter host plant of hop aphis 14 
Quassia against hop aphis 28-30 
and whale-oil soap, cost per 100 gallons 35 
effective only by contact 30 
effect on aphides ". 28 
formulas , 29 
noninjurious to hops 30 
preparation 29 
quality 29 
Report form for use in spraying against hop aphis 31 
Rods for spraying against hop aphis 33 
Sloe, winter host plant of hop aphis 14 
Soap, cresol, and nicotine sulphate against hop aphis 25 
ineffective against hop aphis 25 
lye-resin, and nicotine sulphate against hop aphis 25 
ineffective against hop aphis 25 
whale-oil, and nicotine sulphate against hop aphis 25-27 
quassia, cost per 100 gallons 35 
mixing it with nicotine solutions 27 
versus flour paste as a spreader for contact insecticides 28 
Spraying against hop aphis, boiling and mixing plant 32 
cost 35-36 
direction in which to work 30-31 
exchange tanks 33 
nozzles 33 
spraying machinery 31-35 
report in daily use 31 
spray rods 33 
supply wagons 32-33 
tanks, arrangement 32 
description 32 
exchange 33 
Spraying machine, compressed-air, description and patent by Theo. Eder 33-35 
Spray materials against hop aphis, effect on quality of hops 30 
Stethorus punctum, enemy of hop aphis 23 
Supply wagons for spraying against hop aphis 32-33 
Syrphus americanus, enemy of hop aphis 22 
opinator, enemy of hop aphis 22 
Tanks, exchange, for spraying against hop aphis 33 
for spraying against hop aphis, arrangement, description 32 
Tobacco solution, blackleaf , against hop aphis 25 
waste solution against hop aphis 25-26 
TripMeps insidiosus, enemy of hop aphis 23 
Weather. (See Heat.) 
o 
