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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
Table 5—Walnut Aphis in Tent 2, Santa Ana, Orange County 
Number of 
Number of 
Date 
leaves 
aphids per 
Percentage of 
examined 
leaf 
aphids infected 
August 1. 
20 
40.00dbll.28 
0 . 
August 9. 
13 
50.23bb 9.55 
0.15dr 0.36 
August 16.... 
10 
91.80 dr 10.50 
1.20d= 0.30 
August 30.... 
10 
102.30rb 4.45 
25.71=b 2.95 
September 12. 
10 
89.80dr 9.95 
84.97 dr 1.99 
September 20. 
10 
70.50dr 7.91 
95.60 dr 1.16 
Number of 
living aphids 
per leaf 
40.00±11.28 
50.15± 9.56 
90.70=bl0.33 
76.00=b 4.50 
13.50rb 2.19 
3.10rb 0.98 
On August 1 it was found that the grove there was an average of 
slightly over 41 aphids per leaf, of which about one half of 1 per cent 
