22 



THE RICE WORM (tYLENCHUS ANGUSTUS) AND ITS CONTROL 



somewhat tliiuner. Numerous typigal cases of ufra in tlie early stages were present 

 in the former, and a few in the latter near the boundary (a 6-inch bund) between 

 the two. In some jjlants it was estimated tliat between 50f) and 750 worms and 

 200 eggs were present in the inner layers of the shoot bud, above the growing point, 

 in greatest numbers about 3 or 4 inches above the latter. The photograph 

 reproduced in Fig. 2 was taken on September 9th. Scarcely any crop was got 



Fig. 2. Gondition of the paddy plots in Experiment VII on Sept. 9th, 1913. The plot on the left 



is that originally inoculated. 



from the inoculated plot, while about a quarter of the other was damaged. The 

 stubble was loft as before until the beginning of A2)ri], 1914, when it was all care- 

 fully hand-picked off and destroyed. On 7-4-' 14 both plots were re-sown with 

 local seed. No ufra appeared and a normal crop ripened in the last week of 

 November. 

 VIII. The inoculated plots at Dacca, described on pp. 11-13 of the previous paper, 

 were harvested in December, 1912, and the stubble destroyed, the plots being 

 burnt over carefully. Paddy was grown on these plots without any trace of 

 ufra, up to 1917, when they were sown with seed from an infected field as described 

 under Experiment XI. 

 IX. Three small plots were transplanted with paddy seedlings early in the rains in 

 1913. 8-9-'13, 20 fresh infected central shoot buds from Experiment VII, 

 with the outer leaves stripped off, were pinned down in the water channel near 

 the inflow to the middle plot. The other plots received water from the same 

 channel by inlets, one higher up and one lower down. 9-10-'13, the plant nearest 

 the inlet in the central plot was removed. It had chlorosed shoots but no brown 

 stains. It was found to be heavily infested in the inner layers of the shoots. 

 7-11 -'13, the central plot now totally infected and signs of spread into the other 

 two. 1-12-'13, the central plot almost all dried up and with little grain. In the 

 other plots most of the plants were in ear, but there was a good deal of injury and 

 some plants were barren. The photograph reproduced ni Fig. 3 was taken 



