32 THE RICE WORM (tYLENCHUS ANGUSTUS) AND ITS CONTROL 



In 1915 the experiment was continued in one of the two duplicate plots 

 only. The treatment and cropping were the same as in 1913, except that the 

 seed was not sown until April 10th and 11th. The crop on the first plot was 

 destroyed by a flood. The second gave 16| maunds aus but only a little over 

 a maund aman, the latter having been almost destroyed by the flood. The 

 third gave 22| maunds aus and 12| maunds aman. The jute in the fourth 

 plot was much injured by flooding and only gave 3 maunds, while there was a 

 yield of 17 maunds rice in this plot. All the figures are calculated to the acre. 

 There was no ufra in any of the plots nor in any field immediately adjoining 

 them, though there was some not far away. 



In ipi3 an experiment was made at Bikrampur in Dacca District. There 

 had been total loss of the ^^^nter crop in 1912, and a somewhat similar state of 

 affairs had prevailed, according to the local people, for several years previously. 

 Seven acres of land in the middle of this infected area were marked off and the 

 stubble burned in December, 1912. The area was then ploughed and harrowed 

 five times between December 23rd, 1912, and February r2th, 1913. From 

 March r2th to 20th the usual local mixture of broadcast aus and aman was 

 sown after floating off the light grains in salt water. One acre in the middle 

 received 20 maunds of lime also, a month before sowing. The crop was 

 damaged by the rice Hispa, especially on the limed plot, but the }deld was 

 44f maunds aus and 76^ maunds aman, or a total of over 17 maunds per acre, 

 which is quite a normal crop. No ufra appeared and the owners stated that 

 it was the first normal crop they had harvested for some years. There was a 

 lot of ufra in the .ourrounding fields, though it was said to be much less than in 

 former years. Hence the experiment was not considered by Mr. Hector to 

 be conclusive. 



The Bikrampur experiment was continued in 1914, but no lime was added. 

 Seven acres in a block were selected as before, the stubble burnt in mid-Decem- 

 ber and the land well ploughed between January and somng time, which 

 extended from March 13th to the first week in April. Five acres got the usual 

 mixture of broadcasted aus and aman, while the other two were sown with 

 jute and broadcasted aman mixed (a local practice). No ufra appeared and 

 the yields averaged 11| maunds each of aus and aman per acre, together with 

 17 1 maunds per acre of jute. 



In 1917 the experiment was repeated on a larger scale in over 50 acres in 

 5 separate blocks. Most of the area got deep-water paddy, but a little grew 

 mixed aus and aman or jute and aman. The aus was free from disease, but 

 about 12 acres of the aman, scattered through the 5 blocks, got attacked by 

 ufra. The extent of the damage was not reported. 



