42 THE HOP APHIS IX THE PACIFIC REGION. 



Page. 



Aphis, hop. reproduction, method 12-13 



spraying experiments in control 24-27 



time to begin 23-24 



summary, general 37 



young, number deposited by viviparous females 16-17 



melon, comparison of head with that of hop aphis 15 



Aphis gossyp s - Aphis, melon.' 



Boiling and mixing plant for spraying against hop aphis 32 



Camptobrochis mbulosus, enemy of hop aphis 23 



Ch ilocorus orbus. enemy of hop aphis 22 



Chrysopa californ ica. enemy of hop aphis 22 



Cladosporiurn sp.. blackening of hops caused thereby 22 



growing on honeydew excreted by hop aphides 21-22 



Clean culture against hop aphis 36 



Cocci nella abdominalis . enemy of hop aphis 22 



califomiea. enemy of hop aphis 22 



Compressed-air spraying machine, use against hop aphis, description 33-35 



Cost of spraying against hop aphis 35-36 



Cultural methods against hop aphis 30-37 



Direction in which to work in spraying against hop aphis 30-31 



Fertilization in control of hop aphis 37 



Flour paste, advantages over whale-oil soap as a spreader for contact insecti- 

 cides 



and nicotine sulphate against hop aphis 20-27 



cost per 100 gallons 35 



effect on quality of hops 30 



preparation 27 



Formica subsericea. relation to hop aphis 19 



Fungus, smut. ^See Cladosporiurn sp.) 



Heat, effect on hop aphis 20-21 



Hippodam la con i argent, enemy of hop aphie 22 



Honeydew excreted by hop aphis, black-smut. fungus (Cladosporiurn sp.) grow- 

 ing thereon 21 



effect on hops 22 



Hop aphis. | See Aphis, hop.) 



food plant of hop. aphis 21 



picking off infested leaves for control of hop aphis 37 



sometimes winter host plant of hop aphis 14 



vines, damage by black-smut fungus (Cladosporiurn sp. | growing on honey- 

 dew excreted by hop aphis 21-22 



stripping them in control of hop aphis 37 



Hops, blackening caused by smut fungus. Cladosporiurn sp 22 



quality as affected by spray materials used against hop aphis 30 



Irrigation in control of hop aphis 37 



Lime sulphate ineffective against hop aphis 25 



Machinery for spraying against hop aphis 31-35 



Nicotine solutions, mixing them with whale-oil soap 27 



sulphate against hop aphis 25-27 



and cresol soap against hop aphis 25 



flour paste against hop. aphis 26-27 



cost per 100 gallons 35 



lye-resin soap against hop aphis 25 



whale-oil soap against hop aphis 25-27 



