116 oHobanchk as a I'Arasite in fjihAi: 



that the western plot (C) always had the most " tokra " irrespective of whether 

 it had received sodium nitrate or not. 0. cernua was not present. 



(c) Cahhaije. The same two plots (E and F). as in the season 1915-16. were 

 planted out with cabbages. Each plot contained 196 cabbage seedlings and 

 each seedling in the western plot (E) received 1 oz. of sodium nitrate applied 

 in solution in three doses. The "tokras" were counted on 28th February 

 and the figures were : — 



Number of cabbages Number of 0. indica 



Manured (E) .. 196 592 



Unmanured (F) .. 196 642 



0. cernua was not present at all. These results agree with those of the 

 previous season in the fact that the quantity of "tokra" in the manured 

 plot (E) was substantially the same as in the unmanured plot (F) — although 

 the same plot had received the nitrates in two successive years. The most 

 striking difference is in the actual amount of 0. indica present in the second 

 season relative to what was present in the first, a comparison showing a reduction 

 from about 3,000 to 600 in both plots. This peculiarity has already been 

 mentioned in the case of the tobacco and mustard at Pusa and appears also 

 in that crop at Birowlie. It is important to notice that the decrease affects 

 equally manured and unmanured plots and is entirely independent of the 

 ajDplication of sodium nitrate. 



Tobacco New Plot. During the season 1915-16, a plot (about one-twentieth 

 acre) of tomatoes in the kitchen garden was n.oticed to be suffering severely 

 from both 0. cernua and 0. indica. This plot was ploughed and harrowed in 

 May 1916 and after cultivation was planted out with tobacco in October. The 

 tobacco was planted in 8 rows oi 30 plants in each row, the lines selected being 

 those in which the tomatoes had stood during the previous season, the correct 

 position having been marked before taking up the tomatoes. The plot was 

 then divided into four equal areas (X, Y, Z, V), and sodium nitrate at 

 the rate of 1 oz. per plant was applied in solution to the south-eastern 

 (X) and north-western quarters (Y) of the plot (Text-figure 5, p. 117). 



"Tokra" appeared early in December and came up in large numbers 

 until the crop was cut on 1st March. The amounts of "tokra" present 

 were as follows : — 



Number of Number of 0. cernua 



tobacco plants 



Manured areas .. ' .. 60—60 2,999 (X)— 5,566 (Y) 



Unmanured areas . . 60—60 7,956 (Z)— 2,685 (V) 



