560 



screened hydrated lime, kaolin and kieselguhr [a kind of fossil earth]. 

 The source of copper was anhydrous copper suphate ; both calcium 

 arsenate and lead arsenate furnished the arsenicals, and the nicotine 

 was derived from nicotine sulphate. A power duster was used, 

 equipped with flexible outlet tubes and rnetal spreaders ; these were 

 arranged in various ways and bent at different angles according to the 

 nature of the crop to be treated, so that the best possible distribution 

 with the least waste of material could be secured. Under both labora- 

 tory and field conditions hydrated lime, kieselguhr and kaolin as carriers 

 of nicotine proved of equal value in Aphid control, lime being the 

 cheapest. In the laboratory 3 per cent, nicotine dust proved the most 

 effective in the control of Myzus persicae, Sulz. (spinach aphis), 

 Macrosiphum solanifolii, Ashm. (pink and green aphis), Brevicoryne 

 (Aphis) brassicae, L. (cabbage aphis), and Aphis gossy pit, Glov. (melon 

 aphis). Taking the average for the four species, the 1, 2 and 3 per cent, 

 nicotine impregnated dusts killed 72-2, 82-1 and 89-3 per cent, 

 respectively. For the two first-named Aphids on spinach a hydrated 

 lime-carrier with 2 per cent, nicotine impregnated dust proved the most 

 economical. The quantity necessary varied from 20 to 40 lb. per acre. 

 For the control of the Colorado potato beetle {Leptinoiarsa decemlineata, 

 Say) a dust mixture, containing at least 20 per cent, calcium arsenate, 

 is recommended. Against Phytometra (Autographa) brassicae, Riley 

 (cabbage looper), and Pieris [Pontia) rapae, L. (imported cabbage 

 worm), on kale and Brussels sprouts, a material called Noburn, con- 

 taining approximately 23 per cent, arsenious oxide derived chiefly from 

 Paris green, and a 50 per cent, calcium arsenate dust gave equally good 

 results. The former was the more rapid in action. 



Stearns (L. A.). The Life-history of the Oriental Fruit Moth in 

 Northern Virginia. — Virginia Agric. Expt. Sta., Blacksburg, 

 Montgomerv, Tech. Bull. 21, March 1921, 46 pp., 8 figs. [Received 

 12th September 1922.] 



This bulletin gives an account of the life-history of Cydia {Laspeyresia) 

 molesta, Busck (Oriental fruit moth), in more detailed form than in 

 previous publications [R.A.E., vi, 369, 373 ; vii, 478 ; viii, 354, etc.]. 

 In the course of these investigations it was found that there were four 

 complete generations in 1919 and 1920. Only a partial fourth was 

 recorded in 1920, as a small percentage of the third generation larvae 

 failed to transform. This is probably the normal occurrence. A 

 summary of the seasonal life is shown in a chart. 



Control of Insect Pests and Diseases of Vegetable Crops. — Mtkly. Bull. 

 Ohio Agric. Expt. Sta., Wooster, vii, no. 5-6, May- June 1922, 

 pp. 89-97. 



Information is given on general measures that will tend to keep down 

 insect infestation. These include clean cultivation, the application 

 of fertilisers, and the use of domestic animals. The more general 

 insecticides and fungicides are enumerated, with instructions for their 

 preparation ; and a table shows the commonest forms of insect and 

 fungous infestations of the different crops, with particulars of remedies 

 for each. 



