94 



ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 46 



Table 1. — Spray chart for some important diseases of Illinois trees. 



Season 



Plant 



Disease 



Material in 



100 Gallons 



OF Water 



Number 



OF 



Sprays 



Days 



Between 

 Sprays 



April- 

 May 



Hawthorn, 

 crab apple, 

 etc. 



Rusts 



Ferbam {Fermate 

 or Niagara Car- 

 bamate), 2 lb. 

 or 



Thiram {Thylate 

 Thiram Fungicide), 

 2 1b. 



4-5 



7-10 



April- 

 May 



Juniper 



Rust 



Cycloheximide 

 [Acti-dionc or 

 Aclispray), 50 

 (380 mg.) tablets 



1 





April- 

 May 



Sycamore 



Anthracnose 



Organic mercury 

 {Puratized Agri- 

 cultural Spray, 

 V/2 pt. first spray, 

 1 pt. second spray, or 

 Coromerc, 1 '/2 lb. 

 first spray, 1 lb. 

 second spray) 



2 



14 



April- 

 May 



Juniper Twig blight 



Organic mercury 

 {Puratized Agri- 

 cultural Spray, 1 pt., 

 or Coromerc, 1 lb.) 

 or 



Copper sulfate, 8 lb. ; 

 hydrated lime, 8 lb. 



10 



April- 



Pine, spruce, 



Tip blight 



Organic mercury 



May 



Douglas 





{Puratized Agri- 





fir 





cultural Spray, 1 pt 

 or Coromerc, 1 lb.) 



10-14 



Copper sulfate, 8 lb.; 

 hydrated lime, 8 lb. 



April- 

 May 



April- 

 May 



Pine 



Needle blight 



Maple, willow Tar spot 



Organic mercury 

 {Puratized Agri- 

 cultural Spray, 1 pt., 

 or Coromerc, 1 lb.) 

 or 



Copper sulfate, 8 lb.; 

 hydrated lime, 8 lb. 



21 



inic mercury 

 {Puratized Agri- 

 cultural Spray, 1 pt., 

 or Coromerc, 1 lb.) 

 or 

 Copper sulfate, 8 lb. ; 

 hydrated lime, 8 lb. 



1-2 



21 



