1MH.X. 71 
Merrill system <>!" measuring trees without apparatus 
Olive, food plant of black scale i_- 
Orange. I Set Citrus, I 
Ornamentals, food plam.- of black Bcale ii! 
PhyllocopU* oleivorus. (Sa also Mite, Bilver, of lemon.) 
enemy of citrus fruits 1 1 
Potassium cyanid, amounts recommended in schedules of more Lmportanl \\ tit- 
ers on fumigatioD 21 22 
for t'u in i u;i i ion, protection 55 
puriix required 30 
Vaeudoeoecus spp (Set Meal) bugs.) 
Scnsst tia h misphserica, enemy of citrus fruits II 
olci . (Sa Scale Mack.) 
Scale, black, distribution in California L2-13 
enemy of citrus fruits 11 
method of propagation K> 
nature of injury to citrus trees L5-16 
cottony cushion. (See Icerya j>i<r<'ltasi.) 
hemispherical. (See Saissi tia h mispha rim.) 
oleander. (See Aspidiotus hedera .) 
purple, difficult to destroy on fruit 46 
distribution in California 11-12 
enemy of citrus fruits 11 
eradication 46 
fumigation 40-46 
length of exposure 44-45 
preliminary experiments 40-43 
method of propagation 10 
nature of injury to citrus trees 11 I ... Hi 
red, distribution in California 13 
enemy of citrus fruits 31 
method of propagation 16 
nature of injury to citrus trees 14- L5, L6 
m if t 1 in >\vn . (See ( 'oceus hesperidtnn . ) 
yellow, distribution in California 13 
enemy of citrus fruits 11 
met hod of propagation 1 6 
nature of injury to citrus trees L6 
Scales, citrus, fumigation 17 68 
advantages under improved system 63 64 
apparatus in improved system 
present system L8 I" 
chemicals 30 10 
mixing 39 40 
mosl economical proportion 39 
cover for generators 56-58 
cyanid. amounts recommended in schedules of more 
important writerson fumigation -1 22 
cover 55 
protection 55 
sage schedule in improved system <> I 67 
schedules of more important writers 19-24 
