ROOT-KNOT DISEASE OF TOMATOS. 



43 



Table IX. 



Substance put on in 

 Jan. 



Plot. 



Infection 

 at end of 



Infection 

 at end of 



Infection 

 at end of 







1914. 



1915. 







1916. 



: 



Nitric acid 



i 



X 



0 



O 



* 



Phenol . 



4 



XXXX 



0 



Tr 





Kainit .... 



5 



xxxx 



0 



XXX 



— 



Clubicide 



6 



XX 



0 



XX 





Common salt 



7 



XX X 



0 



X 



— i 



Potassium permanganate 



8 



X 



0 



O 



* 



Copper sulphate 



9 



X 



0 



Tr 



— 1 ! 



Kainit .... 



ii 



X 



0 



O 





Chromic acid 



21 



XX 



0 



O 





Potassium bichromate 



22 



XX 



0 



O 





jYIercury bichloride 



O 2 



xxxx 



Q 



O 



* 



Potassium cyanide . 



24 



XXX 



0 



O 



* 



Lysol .... 



26 



XX 



0 



XX 





Mercury bichloride 



29 



XXX 



0 



O 



* 



Phenol .... 



31 



X 



0 



O 



* 



" V.C." 



34 



X 



0 



X 





Potassium cyanide . 



4i 



xxxx 



0 



Tr 





Carbosol 



45 



X 



0 



Tr 





Kainit and caustic soda 



46 



X 



0 



O 



. * 



An examination of this table shows that the effects of kainit, 

 Clubicide, common salt, Lysol, and " V.C." were not permanent. Those 

 whose effects had lasted for two seasons are starred in the last column. 

 It may be here remarked that the stunting effect in Plots 5, II, and 

 23 were still visible in 1916, though in a less degree than in the previous 

 year. 



The majority of these substances had, however, been tried again, 

 and the results are given in the next table for comparison with those 

 of Table IX. 



Table X. 



Substance. 



Plot. 



Infection at 

 end of 1915. 



Infection at 

 end of 1916. 



Phenol .... 



47a 



XX 



0 



>>•••• 



476 



XX 



X 





47c 



XX 



0 



>»•••• 



47^ 



XX 



0 



Clubicide . . 



32 



XXX 



Tr 



Common salt . 



17 



XXX 



X 



Copper sulphate 



37 



X 



XX 



>> • 

 Mercury bichloride . 



56 



XX 



XXX 



25 



xxxx 



Tr 





52 



X 



Tr 



Potassium cyanide . 



20<3 



xxxx 



X 



... 



20& 



xxxx 



O 



• • . 



20C 



xxxx 



O 



Lysol .... 

 "V.C." .... 



19 



XXX 



XXX 



60 



XXX 



XX 



Carbosol .... 



58a 



xxxx 



XX 



>>•••• 



5§& 



xxxx 



XXX 



