418 



DuTT (H. L.). Agrotis at Colgon and Ghogha.— ^^'nc. Jl.,Dept. Agric.,. 

 Bihar and Orissa, Patna, iii, no. 2, October 1915, pp. 33-40, 1 map. 

 [Received 3rd August 1916.] 



The Andres-Maire trap was used during 1913-14 against Agrotis 

 ypsilon attacking rabi crops in the Bhagalpur district. During 1913,. 

 traps were working between 9th September and 23rd December at 

 Ekchari and between 17th September and the latter date at Tawrar. 

 In the former locahty, marked success attended the use of the traps 

 and no damage from A. ypsilon was noted ; in the latter, injury was 

 limited to about 12| acres. The number of moths captured during 

 the season was 45,465, of which 26,652 were females. During 1914 

 a certain loss in the crops was reported from both locahties ; this 

 was however partly due to the abnormal drought between the end of 

 September and January. Traps were used on a larger scale than in 

 the preceding year ; at Ekchari the number of moths caught was 

 23,535, of which 10,469 were females. The results of the campaign 

 have had the effect of slightly increasing the value of the land and of 

 bringing into cultivation land which has been lying waste owing to 

 former ravages by this moth. 



Duncan (R. S.). Dust Sprayer Tested in Mr. Gibson's Orchard.— 



Canadian Horticulturist, Peterboro, Ont., xxxix, no. 7, Julv, 1916, 

 p. 166, 2 figs. 



The dust spray tested on orchard trees consisted of a mixture of 

 85 per cent, sulphur and 15 per cent, lead arsenate. The quantity 

 used for each tree varied from 1 to 2 lb. for each application. No 

 opinion can yet be given on the value of this spray. The chief advan- 

 tage is the ease and rapidity with which the spray can be applied. 

 Application should be made on a calm day at the same dates as those 

 on which liquid sprays are generally used. 



CoAD (B. R.). Cotton Boll-Weevil Control in the Mississippi Delta^ 

 with Special Reference to Square Picking and Weevil Picking. — 

 U.S. Dept. Agric, Washington, D.C., Bull. no. 382, 8th Julv 1916, 

 12 pp. 

 The heavy rainfall prevailing in the delta region of the Mississippi 

 favours the survival of the cotton boll weevil [Anthonomus 

 grandis] in fallen squares. Tests were therefore made to determine 

 the value of collecting hibernating weevils from the plants in spring 

 and of destroying fallen squares. In 1915 square-picking was begun 

 on 16th June and was repeated at intervals of seven days until 14th 

 July. Comparison with a control plot showed an increase of 23 per 

 cent, of seed cotton in the picked plot. Beneficial results were obtained 

 by the collection of weevils from standing plants, by shaking them 

 into sacks held below the plant and later destroying them by means of 

 water covered with a layer of kerosene. This method proved to be 

 superior to hand-picking, since, in the latter, wee^^ls were liable to be 

 overlooked or to fall to the ground when the plant was disturbed. 

 When however the cost of labour was taken into consideration, the 

 margin of profit appears to be too shght to render these measures 

 of commercial value. 



