583 



Further experiments were continued in 1920 to determine the 

 comparative values of trap crops and baits as control measures 

 [R.A.E., A, ix, 35J. It is thought that seedling onions were saved 

 from infestation as many first generation eggs were deposited on the 

 trap crops, and the value of these is thought to be great. 



Lyne (W. H). Report of Chief Inspector of Imported Fruit and 

 Nursery Stock.~15th Ann. Rept. B.C. Dept. Agric, 1920, 

 Victoria, B.C., 1921, pp. Q 61-67. 



Many strawberry plants in 1920 were badly infested with the 

 crown-miner {Arisiotelia sp.). Raspberry canes and blackberry stock 

 were attacked by Diaspis { Aulacaspis) rosae and other pests. Pre- 

 cautions should be taken to prevent the Japanese beetle {Popillia 

 japonica) from being imported with nursery stock and other plants. 

 Larvae identified as closely allied to the native species of Anomala 

 and some at present unidentified have been found on the roots of 

 ornamental trees and of iris plants. 



Anarsia lineaiella was intercepted in plums, apricots and peaches ; 

 the corn ear worm {Heliothis obsoleta) in Mexican tomatos ; Plodia 

 inter pundella, Pyralis farinalis, Calandra oryzae and beetles of the 

 genera Tenebroides and TrihoUum in peanuts and rice ; P. inter- 

 pundella in walnuts ; and potato tuber moth {Phthnrimaea operculcUa) 

 in larval and pupal stages in potatoes shipped from New Zealand. 

 Wheat from Sydney was badly infested with Tviholiwn beetles. 



In April 1920, by Dominion Order in Council, an embargo was placed 

 on lucerne hay coming from Idaho and certain parts of Wyoming and 

 Colorado to prevent the importation of the alfalfa weevil [Hyper a 

 variabilis]. 



Insecticides and Fungicides. — Jl. Minist. Agric, London, xxviii, 

 no. 7, October 1921, pp. 628-631. 



It has been found necessary, from motives of economy, to postpone 

 the introduction of the Bill for the regulation of the trade in certain 

 of the chemicals in use for the control of pests in Britain. It is beheved, 

 however, that many manufacturers are prepared to meet the terms 

 of the Bill even in the absence of legislation, and purchasers are urged 

 to stipulate before taking dehvery that the articles supphed should 

 comply with the conditions laid down. 



The more important provisions of the measure are as follows : — 

 The total amount of arsenic in lead arsenate paste should not be less 

 than 14 per cent, of the paste as sold, nor less than 28 per cent, of the 

 paste when dried at 100° C. [212° F.], the arsenic being expressed in 

 terms of arsenic oxide (Asg O5 ). The amount of water-soluble arsenic 

 in the paste should not exceed 0-5 per cent, expressed as arsenic oxide, 

 and substances other than lead arsenate and water should not exceed 

 3 per cent. The actual percentage of arsenic in the paste, as well as 

 the dilution required to produce a standard spraying mixture con- 

 taining 0-1 per cent, of arsenic oxide, must be stated on the label. 

 Larger percentages of water-soluble arsenic than stated above will 

 cause injury to fohage. The standard spray mixture of 0-1 per cent, 

 of arsenic oxide may be regarded as effective under all conditions, 

 and even unnecessarily strong against young caterpillars, for, which it 

 may be diluted by using f lb. of paste where 1 lb. is prescribed. 



