40 THE RED SPIDER ON HOPS IN CALIFORNIA. 
Page. 
Pea, food plant of Tetranychus bimaculatus , 16 
sweet, food plant of Tetranychus bimaculatus 16 
Peanut, food plant of Tetranychus bimaculatus 16 
Pecan, food plant of Tetranychus bimaculatus 16 
Pelargonium, food plant of Tetranychus bimaculatus 16 
Pentilia sp. , enemy of red spider 19 
Pepino. (See Solanum muricatum.) 
Pepper, food plant of Tetranychus bimaculatus 16 
Persicaria lapathifolia, food plant of Tetranychus bimaculatus 16 
Phlox, food plant of Tetranychus bimaculatus 16 
Pigweed, rough. (See Amaranthus retro fiexus .) 
Poplar, Carolina, food plant of Tetranychus bimaculatus 16 
Privet, food plant of Tetranychus bimaculatus 16 
Psylliodes punctulata, banding of hopvines with tanglefoot in control 28 
Ptelea trifoliata, food plant of Tetranychus bimaculatus 16 
Pumpkin, protection from red-spider injury 35 
Raspberry, food plant of Tetranychus bimaculatus ' 16 
Red spider, adult, description, copulation, parthenogenesis 12-13 
bibliography 35-36 
citrus. (See Tetranychus mytilaspidis.) 
control experiments on hops 20-34 
methods of experimentation 20 
recommendations on hops 34 
upon plants other than hops and cotton 34-35 
cost of spraying hopyards 30 
cultural methods on hops 30-34 
damage to hops, nature 17-18 
distribution in the field 18-19 
economic importance on hops 9-10 
effect upon man 18 
egg, description, location, incubation 10 
emergence from hibernation 15 
enemies, predaceous 19 
first appearance en hops in season 15 
food plants 16 
habitation on hops 13 
habits 13-16 
hibernation 13 
emergence therefrom 15 
larva, descriptive, length of stages 11 
life history on hops 10-12 
locomotion 14-15 
methods of applying sprays on hops 29 
migrating activities 15-16 
nymph, descriptive, length of stages .■ 11 
protection on hops 13 
summary, with recommendations for control 34 
Rose, food plant of Tetranychus bimaculatus 16 
Roses, greenhouse, protection from red-spider injury 35 
protection from red-spider injury 35 
Rudbeckia sp., food plant of Tetranychus bimaculatus 16 
Salvia, food plant of Tetranychus bimaculatus 16 
Sassafras, ornamental, food plant of Tetranychus bimaculatus 16 
