ROOT-KNOT DISEASE OF TOMATOS. 



47 



The others were " cures " of one year's standing, as shown in 

 Table XVII. 



Table XVII. 



[Plot. 



1916. 



Treatment. 



1917. 



2 



X 



Creosote emulsion 



O 



IO 



X 



Izal 



O 



15 



XX 



Jeyes' Fluid 



O 



206 



XXXX 



Potassium cyanide 



O 



20C 



xxxx 





O 



47* 



XX 



Phenol 



O 



47c 



XX 





O 



47^ 



XX 



>> 



O 



61 



X 



Cresylic acid 



O 



From the experimental point of view it was an error to put on 

 so much sodium cyanide in House 3, but it had been for many years 

 a troublesome house, and we had found in digging out the roots that 

 the tiny rootlets penetrated the walls on each side of the beds and 

 that some of our difficulties were due to the infection residing in the 

 crevices of the walls. In the previous two years the walls had always 

 got what we considered to be their share of the solutions, but it is 

 difficult to soak a vertical face. It was almost an impossibility to 

 sterilize the walls, and half of the solution was utilized in trying to 

 get them well soaked. Our previous results had shown that 8 or 10 

 cwt. an acre would have sufficed for the subsoil. However, 24 cwt. 

 an acre was the quantity we used. The stock creosote emulsion 

 used consisted of creosote, soap and water, the creosote representing 

 exactly half the volume of the stock emulsion. 



The results for the year are given in the following tables : 



Table XVIII.— Plots Treated with Sodium Cyanide. 



Plot. 



Infection. 



Jan. 1917. 



Oct. 1917. 



53 



XX 



0 



66 



X 



0 



72 



X 



0 



55 



XXX 



0 



65 



X 



0 



20a 



X 



0 



19 



XXX 



0 



54 



XX 



0 



7i 



X 



0 



56 



XXX 



0 



67 



XX 



0 



The results for sodium cyanide are shown to be very satisfactory. 



