FUMIGATION OF CITRUS PLANTS. 



13 



EXPERIMENT 14. 



Condition during fumigation, dark, 9l°-92° F. 



Dosage, 1^ ounces KCN. 



Date, March 15, 1915, 1.30-2.30 p. m. 



Plants in each test, 2; total, 22. 



Remarks: Plants were in a somewhat resistant condition. Temperature of the 

 fumigatorium 80° F. when plants entered, being raised immediately to 90°-91° F. 

 before f umig ation, and thus maintained throughout the exposure. 



Results. 



Condition before 

 fumigation. 



Condition after fumigation. 



Dark, 

 56° F.i 



Shade, 

 80° F.2 



Shade, 

 90° F. 3 



Sun. 

 85° F.4 



Dark, 56° F 



Shade, 80° F 



Sun, 86° F 



2 

 3 

 3 



3 



3+ 

 4 



3+ 

 3+ 

 4 





4 

 5 





1 Temperature uniform throughout day. 



2 Held at sun temperature. 



3 Temperature 85°-90° F. maintained for 3 hours after treatment. 



4 Temperature dropped to 75° F. 3 hours after exposure. 



EXPERIMENT 15. 



Condition during fumigation, dark, 86°-9l° F. 



Dosage, 1J ounces KCN. 



Date, March 18, 1915, 12.35-1.35 p. m. 



Plants in each test, 2; total, 30. 



Remarks: Growth as in experiment 14. Temperature of fumigatorium 73° F. when 

 plants entered, being raised immediately to and maintained at 86°-9l° F. during 

 fumigation. 



Results. 



Condition before fumigation. 



Dark, 62° F. 

 Dark, 90° F. 



Sun, 77° F.. 



Condition after fumigation. 



Dark, 

 63° F.i 



Shade, 

 63° F.i 



Dark, 

 91° F.2 



Shade, 

 89° F.2 



Sun, 

 77° F.3 



i Maximum temperature for 24 hours after treatment, 65° F. 



2 Temperature 86°-91° F. maintained for 3 hours after treatment. 



3 Temperature 3 hours after treatment, 69° F. Slight haze developed during afternoon and at 4.45 p. m. 

 completely obliterated the sun. 



EXPERIMENT 16. 



Condition during fumigation, shade, 61°-63° F. 

 Condition before fumigation, dark, 60° F. 

 Dosage, 1 ounce NaCN. 

 Date, September 22, 1915, 6.10-6.50 a. m. 

 Plants in each test, 4; total, 20. 



Results. 



Condition after fumigation. 



Dark, 65° F.i 



Shade, 64° F.i 



Dark, 73° F.2 



Shade, 70° F.2 



Sun 73° F.2 



2 



2 



2 



2 



l 4 



1 At cool temperatures throughout day. 



2 At equal temperatures throughout the day; maximum 102° F. at 2 p. m. 



