Bul. 907, U. S. Dept. of Agriculture. 
FUMIGATION OF CITRUS PLANTS WITH HypROCYANIC ACID. 
A, Comparative effect of hot sunshine and shade, after fumigation, on citrus plants with resist- 
ant foliage. Immediately following the treatment two plants were placed in direct sunlight 
and one in the shade, at 87° F., and held at parallel temperatures throughout the remainder 
ofthe day. It is noted that leaves in the sun-exposed plants have abscissed at the base of the 
blade. B, Citrus plants with tender foliage which were exposed immediately after fumiga- 
tion to the sun or shade at 79° F. The plant in the shade had merely the tender tips injured. 
A leaves and petioles of the sun-exposed plants were completely burned and cling without 
abscission. 
PEATE Ii. 
