FUMIGATION OF CITRUS PLANTS. 19 
THE INFLUENCE OF SUNSHINE AT VARYING PERIODS AFTER FUMIGATION. 
While experiments 10 to 19 clearly demonstrate the influence of 
sunshine on plants exposed immediately after fumigation, the 
following four experiments set forth the effect of this factor where 
plants are placed in the sunshine four hours or more after treatment. 
EXPERIMENT 20. 
Condition during fumigation, shade, 62°-65° F. 
Condition before fumigation, shade, 66° F. 
Dosage, 1 ounce NaCN. 
Date, September 21, 1915, 8-8.45 a. m. 
Plants in each test, 3; total, 21. 
Results. 
Condition after fumigation. 
Sun, 76° F.,| Sun, 79° F.,| Sun, 80° F.,| Sun, 84° F.,] Sun, 88° F 
Shade, Shade, exposed. exposed. exposed exposed exposed — 
79° Fl 90° F.2 - imme- after 30 after 1 after2 | after3 
diately. | minutes.3 hour.’ hours. | hours.? 
2 2 5 4 4 3 2 
1 Equal to sun temperature throughout the day. 
2 Temperature held at 85°-91° F. allda 
3 Plants removed from fumigatorium to shade (temperature approximately 70° F.) until placed in sun- 
shine. Maximum sun temperature 94° F. at 1 p. m. 
EXPERIMENT 21. 
Condition during fumigation, dark, 58°-60° F. 
Condition before fumigation, shade 60° F. 
Dosage, 14 ounces KCN. 
Date, March 21, 1915, 8-9 a. m. 
Plants in each test, 3; total, 27. 
Remarks: Plants were in a somewhat resistant condition. 
Results. 
Condition after fumigation. 
abera Sun, Sun Sun, Sun Sun, Sun 
Srigullonade. ular: aK, TBE al enti EY ullenzO psa We 7OosHe al 82° W led Be 
64° F.. | 90°-97°8.2| exposed exposed exposed exposed | exposed | exposed exposed 
; at ae Gol after 5 after15 | after 30 after 1 after 2 alter 4 
minutes. | minutes.3} minutes.?| hour.’ hours. hours, 
1 Temperature 64°-70° F. all day. 
2 Temperature fluctuated 96°— 97° F. all day. 
3 Plants held in shade at 61°-62° F. betaveen time of removal from fumigatorium and placement in sun- 
shine. Maximum sun temperature 85° F. at 1 p. m. 
