403 



among tlie more important of wliich are the imported cabbage worm 

 [Pieris rapae], cabbage looper [Phytometra brassicae] and several species^ 

 of Aphids. The first two can be controlled by ii lb. lead arsenate 

 powder to 50 U.S. gals, of water, and for the Aphids 8| o/. nicotine 

 sulphate, 5 lb. fish-oil soap and 50 U.S. gals, of water is recommended. 

 Most of the spraying is done in the autumn, wlien the outbreaks 

 generally occur. Statistics are given regarding the time requisite for 

 preparing and applying the sprays, the amount of solution necessary 

 to spray one acre with a machine drawn at 31 miles an hour, and the 

 total cost of so spraying one acre with either lead arsenate or nicotine 

 sulphate, each being calculated for use on rows planted 20, 24, 30 and 

 36 inches apart. It was found that the saving in the cost of labour 

 and materials by increasing the speed of the team from 3 to 4 miles an 

 hour was over is. per acre when the rows were planted 20 inches apart; 

 that is, a saving of nearly 25 per cent, of the entire cost of application. 



Ingerson (H. G.) & Runner (G. A.). Control of the Grape-berry 

 Moth in Northern Ohio. — U.S. Dept. Agric, Washington, D.C.y 

 Bull. 837, 3rd June 1920, 26 pp., 1 plates, 1 fig. 



This bulletin records the results of studies during 1916-1918 on 

 Polychrosis viteana Clem, (grape- berry moth) in northern Ohio. The 

 life and seasonal history are briefly described [R.A.E., A, iv, 190, 383, 

 etc.], but the bulk of the information deals with control experiments,, 

 which are described in detail and summarised in a series of tables. 



Under northern Ohio conditions, vineyards should be prepared for 

 winter at the end of the cultivation season in July and left without 

 further cultivation until the spring, in order to increase the winter 

 mortality of the pupae. Of the many sprays tried, the one that ha^ 

 given the greatest success consists of \h lb. lead arsenate powder or 

 3 lb. paste to 50 U.S. gals, liquid, with the addition of 1 lb. resin 

 fish-oil soap to act as a spreader and adhesive, used either in Bordeaux 

 mixture or, if in water, with 2 lb. freshly slaked lime to each 50 U.S. 

 gaLs. Bordeaux mixture should not be used on the Ives variety of 

 grapes as it injures the foliage. Sufficient spray should be used to 

 cover all clusters with a thin, smooth film of spray material. The 

 first apphcation of spray should be made 3 to 5 days after the grapes 

 have set and the second should begin when the grapes touch in the 

 clusters, that is, usually 3 to 1 weeks after the first. In cases of severe 

 infestation the trailer method of spraying should be used. 



Experiments with a dusting mixture composed of iO per cent, lead 

 arsenate powder to 90 per cent, hydrated lime gave somewhat incon- 

 clusive results ; this method might be satisfactory for treating small 

 areas, but would need much more frequent application than the liquid 

 to be effective. 



Chittenden (F. H.) & Marsh (H. 0.). The Bean Ladybird.— C/..?. 

 Bept. Agric, Washinglon, B.C., Bull. 813, 7th June 1920, 24 pp. 

 5 figs., 6 plates. 



A detailed account is given of Epilachna corrupta, Muls., as occurring 

 in the semi-arid regions of the south-western States, where it is very 

 destructive to the important bean crops raised there [R..i.E., A, vi 

 299]. 



