THE MONTHLY BULLETIN. 



11 



Since Professor Fawcett is to publish a detailed account of his experi- 

 ments and work on this problem, it is unnecessary for me to deal 

 further with this phase of the subject. However, the treatments given 

 in the past and those which will be carried on the the future, looking 

 to the complete control of this disease, the costs, and the results which 

 we nay expect to obtain, may be of some interest to those who hope to 

 receive the maxinuun production from their limited aie;i of land. 



The results of any treatment or work of this nature can only be 

 determined by comparing them with other treatments or plots upon 

 which no control work has been done — check plots. In order to de- 

 termine the value of the Bordeaux paste, check rows were left in one 

 orchard on which the cutting away, scoring, etc., were carried on, but 

 where Bordeaux was not used to disinfect the cuts and to prevent 

 further infection taking place. As will be seen by a eompaiisi n of plats 

 in Table No. 1 and also 5sO. 2, the results are in favor of the Bordeaux- 



TABLE No. 1. 

 Results from two years treatment of citrus trees for brown rot gummosis. 



Extent of 



Infection before 



treatment 



Slight - 

 Medium 

 Bad — 



Slight - 

 Medium 

 Bad -.- 

 Slight - 



Medium 



Bad .._ 



Slight - 



Medium 



Bad — 



Treatment 



Cutting out and scoring bark 



Cutting out and scoring bark 



Cutting out and scoring bark 



Bordeaux iiaste 



Bordeaux paste 



Bordeaux jiaste 



Cutting out and scoring bark, first year. Bor- 

 deaux ])aste, second year 



Cutting out and scoring bark, first year. Bor- 

 deaux paste, second year 



Cutting out and scoring bark, first year. Bor- 

 deaux paste, second year 



Trees of Plat 2 still gumming: re-treated see 



ond year with Bordeaux paste 



Trees of Plat 2 still gumming; re-treated sec 



ond year with Bordeaux paste 



Trees of Plat 2 still gumming; re-treated sec 

 ond year with Bordeaux paste 



Kesults after treating 



Trees 

 cured 



Trees 



I still 

 1 gumming 



81.2% 

 50.0% 

 7.1% 

 82.3% 

 62.5% 

 23.0% 



66.0% 



87.5% 



20.0% 



66.0% 



66.0% 



55.0% 



Trees 

 dead 



18.7% 



50.0% — 



21.1% 71.5% 



17.6% 



37.0% 



66. n% 10.0% 



33.0% 



I 12.5% 



30.0% 50.0% 



33.0% 



22.0% 



10.0% 



11.0% 



35.0% 



TABLE No. 2. 

 Results of a two-year experiment in treating old gummed trees. 



Extent of 

 infection 



before 

 treatment 



Slight 



Medium . 



Bad 



Slight 



Medium _. 

 Bad 



Treatment 



Cutting and scoring before sec- 

 ond year, Bordeaux paste, sec- 

 ond year 



Cutting and scoring before sec- 

 ond year, Bordeaux paste, sec- 

 ond year 



Cutting and scoring before sec- 

 ond year, Bordeaux paste, sec- 

 ond year 



Bordeaux paste two years 



Bordeaux paste two years 



Bordeaux paste two years 



Effect of treatment 



Trees 

 cured 



No. 



15 



15 



3 

 16 

 21 

 18 



Per 



cent 



93.7% 



93.7% 



21.3% 

 94.1% 

 87.5% 

 60.0% 



Trees still 

 gumming 



No. 



Per 

 cent 



Trees 

 dead 



No. 



6.2% 



21.3% 

 5.8% 

 8.3% 

 6.6% 



1 

 10 



Per 



cent 



6.2% 



57.0% 



4.1% 

 33.07o 



16 



16 



14 

 17 

 24 

 30 



