INDEX. 43 



Page. 



Nozzles for spraying against hop aphis 33 



Phorodon humuli. (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 



Triphleps insidiosus, enemy of hop aphis 23 



Weather. (See Heat.) 



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