217 



ScHLUPP (W. F.). Fumigation with Sulphur. — //. Dept. Agric, 

 Union S. Africa, Pretoria, iv, no. 2, February 1922, pp. 132-140. 



Although sulphur as a fumigant is decidedly inferior to cyanide or 

 carbon bisulphide, its comparative safety and cheapness render it 

 a more suitable material for use by inexperienced persons on isolated 

 farms and other places where, owing to circumstances, the use of 

 other fumigants is impracticable. Sulphur fumigation is, however, 

 only effective in very tightly sealed rooms, at the rate of 3 lb. to 

 1,000 cu. ft., continued for at least 24 hours. It should not be used 

 for treating grain that is to be sown, as it affects germination. The 

 method of preparing a room and carrying out the fumigation is 

 described. 



Parks (T. H.) & Clayton (E. E.). Controlhng Tipburn or Hopperbum 

 of Potatoes. Cooperative Demonstrations establish Value of 

 Bordeaux Sprays. — Mthly. Bull. Ohio Agric. Expt. Sta., Woosfer, 

 vi, no. 11-12, November-December 1921, pp. 168-171, 1 fig. 

 [Received 28th February 1922.] 



During 1921 demonstrations of spraying for the control of hopper- 

 bum, due to the leaf-hopper, Empoasca niali, were carried out in Ohio 

 over an area of about 200 acres. The spray consisted of home-made 

 Bordeaux mixture (5-5-50) , to which lead arsenate was added for the 

 first application to kill the potato beetle [Leptinotarsa decemlineata]. 

 Spraying was begun when the plants were 6-8 in. high and repeated 

 from 2-6 times at intervals of two weeks. In most cases 3-4 sprays 

 were applied, 50-125 U.S. gals, of material being used per acre at 

 each application. The general results were very satisfactory, the 

 yield in many cases being increased by 30-35 bushels, and in one 

 case by 82, giving an increase of 76 per cent, over the unsprayed field. 

 Bordeaux dusts of different compositions were also tried, but the 

 results were less satisfactory. Certain varieties of potatoes are more 

 susceptible to hopperburn than others, but a marked increase in the 

 yield was noticed as the result of spraying, even in the semi-resistant 

 varieties. 



Cotton (E. C). The European Com Borer Quarantine Regulations 

 for infested Ohio Areas. — Mthly. Bull. Ohio Agric. Expt. Sta., 

 Wooster,V\, no. 11-12. November-December 1921, pp. 180-186, 

 4 figs. [Received 28th February 1922.]- 



During the summer of 1921 an extensive area, involving all the 

 counties in Pennsylvania, Ohio and Michigan that border upon Lake 

 Erie, has been invaded by the European corn borer [Pyratista nuhi- 

 lalis, Hb.] as the result of natural spread, probably by flight of adults 

 from Canada. In view of the similarity of the topography, climate 

 and type of agriculture in Northern Ohio to that of Southern Ontario, 

 it is to be expected that this moth will increase in a similar manner 

 in the State unless repressive measures are undertaken. All 

 farmers are urged to adopt certain precautions, here described, based 

 on the experience of older infested areas and the knowledge of the 

 life-history and habits of the insect. Extracts are also given from 

 the rules of the quarantine regulations adopted by the United States 

 Department of Agriculture [cf. R.A.E., A, viii, 511]. 



(6239) Wt.P.6/200 1,533 5/22 Harrow G.7S. P 



