74 SCIENTIFIC REPORTS OF THE AGRICULTURAL RESEARCH 



former ripens off about July it becomes unable to supply- 

 food to the worm : the latter must then rapidly fall into the 

 starvation condition which will induce it to wander vigor- 

 ously to the aman crop. 



Some further progress has been made in denning the 

 limits of the infected tract. No new outbreak outside pre- 

 viously known areas was reported during the year except a 

 small extension towards Chittagong. Two fieldmen from 

 Pusa examined the infected areas near Chittagong, in 

 Faridpur, and in the Manikganj Subdivision of Dacca. 



The following demonstrations were carried out by the 

 Bengal Department of Agriculture under advice from 

 Pusa. 



Dacca District, (i) Vikrampur. About 58 acres were 

 treated by burning the stubble and sown with either aman 

 or digha paddy alone or with aus and aman mixed or with 

 aus followed by jute. The aus paddy escaped, the digha 

 was very slightly damaged, but about 12 acres of aman were 

 attacked. The amount of loss was not reported. . 



(ii) Nagari. About 25 acres were treated as above. 

 Uf ra appeared in 3 acres only but the amount of damage 

 was not reported. 



(Hi) Pubail. A small isolated block which has given 

 little or no crop for several years was treated as before. 

 The disease appeared in one part only. The yield was 

 about seven-eighths of a normal crop for the first time for a 

 number of years. Another larger area was similarly 

 treated but the loss was about a quarter of the crop. It 

 was not isolated from untreated infected paddy close by. 



Faridpur District. About 10 acres were treated as 

 above at Gopalganj. No disease appeared until late in the 

 year. Further reports have not been received. . 



A detailed account of the present state of knowledge of 

 the disease has been written by Dr. Butler and it is hoped 

 will be published during the coming year. 



(2) Black band disease of jute. During the rains of 

 1917 an area of about 40 acres of jute (Corchorus capsu- 



