ROOT-KNOT DISEASE OF TOMATOS. 



41 



experimental plots to a great extent and necessitated a sub-division 

 of the Creol plot and Plot 18. Eleven new places were found, 

 perhaps due to the stricter search which concluded the experiments 

 of the year 1915. 



Nitric acid, potassium permanganate, bleaching powder, chromic 

 acid, potassium bichromate, kainit, caustic soda, soot, and sulphur 

 were not tried in 1916, some because they injured the plants, some 

 because they were unobtainable, and others because they had done 

 no good in 1915. 



Six plots were treated with the same substance put on them in 

 1915, viz. : 



Table VI. 



No. 

 of 



Mot. 



Treatment in 1915- 



Quantity 

 applied per 

 acre. 



Treatment in 19 16. 



Quantity 

 applied per 

 acre. 



3 



Pot. sulphate 



121 Cwt. 



Pot. sulphate 



86 Cwt. 



10 



Izal . . . 



335 gals. 



Izal . 



670 gals. 



14 



Black carbolic 



23° 11 



Black carbolic 



4G0 „ 



disinfectant 



disinfectant 





15 



Jeyes' Fluid 



242 „ 



Jeyes' Fluid 



517 » 



19 



Lysol 



312 „ 



Lysol 



626 „ 



57 



Creol 



261 ,, 



Creol 



1,210 „ 



As common salt is a cheap substance and had " cured " its plot 

 in 1915, in spite of the fact that it had retarded the plants in that 

 year, we thought it ought to have another trial. For potassium 

 cyanide and mercury bichloride two of the worst plots were reserved, 

 viz. 20 and 25. Phenol was placed on one of the new places, and 

 liquid carbolic acid on 35, 36, 39, 42, 43, and 44. Carbolic acid had 

 done well on Plots 4 and 31 in the preceding year, was specially recom- 

 mended by the Board of Agriculture, and was easily obtainable, so we 

 thought it ought to have a more extensive trial. Mixed with saw- 

 dust it was placed on Plot 61 also, and worked into the subsoil like 

 vaporite. Later on, this plot was soaked with water. The list of 

 plots treated in 1916 with liquid carbolic acid and with phenol are 

 given in Table VII., together with the applications tried on the same 

 places in 1915. 



Table VII. 



riot. 



Treatment 1915. 



Treatment 1916. 



Quantity per acre. 



35 



" V.N." 



Liq. carbolic acid 



333 gals. 



36 



Vaporite 



11 >> 



333 >i 



39 



Black carbolic disinfectant 



>> 11 



333 „ 



42 



Jeyes' Fluid 





4°5 m 



43 



Izal 



>> >> 



242 „ 



44 



Clubicide 



>> >> 



385 M 



61 







1,089 „ 



47 





Phenol 



29 cwt. 



