20, 2 Lee and Shino: Citrus-canker Control Experiments 135 
Examination was made to observe the effect of the copper sprays in 
increasing scale insects. Ruby scale was observed to a very slight degree, 
but not seriously. Some ruby scale was observed upon trees in the lime- 
sulphur plat, but less than on the other plats. No other scale insects were 
' serious. The blister moth, Phyllocnystis soligna Zell., was observed to be 
equally injurious on all plats. Apparently there was no reduction in the 
injury from this insect in the lime-sulphur plats; nor is there any evidence 
to show that the lead arsenate has caused reduction. This insect is the 
most active agent in disseminating citrus canker in the Japanese orchards. 
In the light of future developments it is interesting to note 
that there were no indications at this tinie of red spider. 
To supplement these field notes, the climatological data col- 
lected at the orchard during the experiments are presented 
here; the temperature and humidity data are contained in 
Table 6, and the rainfall data, in Table 7. 
TABLE 6.—Showing the temperatures and humidity at the experimental 
orchard at Saigo during the experiments. 
Temperature. Humidity. 
cares ‘lute | lute’ | Mean | Mean | 4bte- | Abs°-| Mean | Mean 
maxi-| mini- | Sum. mom, | maxi- | mini- mane hess 
mum. | mum. mum. | mum. 
June: °C, °C, vO °C. | Perct.| Perct.| Per ct. | Per ct. 
RA oe cok ee ee ea 100.0 56.8 99.6 68.4 
RUA MOG cee 28.9 19.0 27.5 20.6} 100.0 66.0 98.0 17.7 
LS 1) Romie Semebeme gam aeahas 28.1 17.5 25.8 19.2} 100.0 71.0 97.6 73.7 
July: 
£00 10 es 29.6 19.0 26.9 21.4; 100.0 68.0 98.6 80.8 
At i 82.2 20.6 30, 2 22.6 | 100.0 50.1 98.7 70.8 
PitO OF i 82.5 22.8 83.1 23.4] 100.0 65.0 98.5 72.5 
August : 
£010 32.8 20.5; 80.4] 22.7| 100.0] 64.0 98.91 71.8 
20 oes oo 83.0} 21.0} 80.4] 28.2] 100.0} 651.1 97.2) 70.1 
Sito 85 32.9 20.5 81.0 22.7 99.2 59.5 97.6 68.9 
September : 
BONO race ees ay 32.9 19.8 29.2 22.5} 100.0 59.0 96.7 72.5 
gb oe | Saepeeke ie ada eres 28.0 18.0; 25.9 19.5 | 99.5 62.5 94.8; 74.0 
ee ee 28.0 16.5 26.2 17.9 | 100.0 40.0 98.0 64.8 
October 
DOG oo ee 79.3 58.0} 75.4] 62.5) 100.0 57.1 98.4 74.4 
Tsto 905 ee 75.3} 61.6} 71.6] 55.7] 100.0} 62.0] 95.0] 71.4 
BY a OE ge ee 74.0; 49.0) 66.5; 63.8] 100.0} 39.5] 98.0! 66.4 
November 
SIO ee 68.0} 62.5) 65.0} 54.7| 100.0 67.0| 96.1] 77.1 
TIO 20 a 65.2; 42.0} 60.4] 47.8} 100.0] 52.5] 94.6] 67.8 
Oh tO 9 oe 58.9 87.9 54.9 42.2 | 100.0 56.5 97.6 64.8 
These tables are of interest in indicating the periods at which 
infection was most active. It seemed apparent, as is recorded 
