XIV, 6 
Lee and Yates: Pink Disease of Citrus 
665 
TREATMENT OF ORCHARD A, LAMAO EXPERIMENT STATION 
Plat I, rows 1, 2, 3, 4, 5, and 6. 
October, 1917 ; Limbs affected with pink disease' pruned out. 
November 28: Lime sulphur. 
January 10: Neutral Bordeaux. 
May 31, 1918: Lime sulphur (change necessitated by increase of 
scale insects). 
June 25, 1918: Neutral Bordeaux. 
It was the original intention to continue the application of neutral 
Bordeaux through the entire period of the control experiments, but 
the increase of scale insects made changes to lime sulphur necessary. 
Plat II, rows 7, 8, and 9. 
Neither pruning nor spraying was employed in this plat, the trees 
consisting of a check on the treated plats. 
Plat III, rows 10, 11, and 12. 
October, 1917 : Limbs affected with pink disease pruned out. 
November 28: Formalin 1-100. 
December 1: Formalin 1-75. 
December 6: Lime sulphur plus formalin 1-80. 
January 9, 1918: Neutral Bordeaux plus formalin 1-100. 
May 31 : Lime sulphur. 
June 24: Lime sulphur. 
July 29 : IJme sulphur. 
It was originally the intention to spray this plat entirely with lime 
sulphur; the applications of formalin, however, were employed be- 
cause of the citrus canker experiments, while the application of 
neutral Bordeaux was made because no lime sulphur was available. 
Plat IV, rows 13, 14, and 15. 
October, 1917 : Pruned for Corticium. 
November 28: Formalin 1-100. 
December 6: Lime sulphur plus formalin 1-80. 
January 9, 1918: Neutral Bordeaux. 
May 31 : Lime sulphur. 
June 26: Bordeaux 4-4-50. 
The changes from Bordeaux to lime sulphur and formalin were neces- 
sitated by the increase in scale insects and developments in the 
citrus canker work. 
Plat V, rows 16, 17, 18, 19, and 20. 
The trees in this plat were neither sprayed nor pruned. 
When pruning is mentioned it means that the trees of the 
plat indicated were gone over thoroughly to locate each case 
of the disease. Every affected limb was cut back far enough 
beyond the extent of the fungus to avoid all possibility of the 
fungus remaining in the unpruned portions. After each cutting 
the v/ound and the pruning implements were disinfected with a 
2 per cent formalin solution. Subsequently each wound was 
painted with white lead. 
In August, 1918, notes were made of the cases of pink disease 
