June, ’18] 
BURGER AND SWAIN: WALNUT APHIS, FUNGUS 
28a 
CHART I 
RELATIVE EVAPORATION 
Table 4—Walnut Aphis in Grove in Santa Ana, Orange County 
Number of Number of Percentage Number of 
Date leaves aphids per of aphids living aphids 
examined leaf infected per leaf 
August 1. 60 41.35± 3.17 0.48±0.29 41.10± 3.17 
August 16. 10 131.70±16.86 4.56±1.07 125.90±16.86 
August 30. 20 35.25=b 3.74 37.45d=2.24 34.55 =b 2.68 
September 12.... 20 13.60=b 2.21 93.38±1.60 0.90=b 0.20 
September 20.... 10 8.80=b 0.81 94.45dbl.24 0.20d= 0 
