Heport upon Injurious Insects and Fungi. 



1892. 



MEMORANDUM. 



The following report, with detailed notices of various insects 

 and fungi noted in 1892 as attacking the crops of the farm, 

 the orchard, or the garden, has been prepared by Mr. Charles 

 Whitehead, F.L.S., in his capacity of Technical Adviser to the 

 Intelligence Branch of the Board of Agriculture. The reports 

 upon injurious insects and fungi which have been hitherto issued 

 by this Department have contained block illustrations only ; 

 but, with the object of facilitating the identification of insect and 

 other pests, it has been deemed desirable on this occasion to 

 illustrate the descriptions given by means of carefully coloured 

 plates. The plates now included have been reproduced from 

 sketches placed at the disposal of the Board by Mr. Whitehead' 

 and it is believed they will materially enhance the usefulness of 

 the report. 



The circumstances of the year under review necessitated the 

 issue of only three leaflets dealing with insect attacks. These 

 were respectively the Apple Blossom Weevil, the Raspberry Moth, 

 and the Mangel Wurzel Fly, the last named infection being 

 probably the most widespread of the pests of the season of 1892. 

 Accounts of the life history of each of these insects, and of eleven 

 others, are now given, together with such suggestions as ex- 

 perience has shown can be offered for the prevention or mitigation 

 of the attacks complained of. 



The two cases of fungoid attacks, which are reported on, form 

 subjects of special interest. The notice of the Plasmodiophora 

 brassicce or Club Root suggests that there is room for further 

 research into the strange conditions of this plague, the recogni- 

 tion of which nevertheless dates back more than a hundred 

 years. 



I 74144. 2500.-~2/93. Wt. 15842. A 2 



