11 



reverse, on the growth of the crop. A test plot, on which cowpeas 

 phinted in trenches among sugar-cane had been dusted with copper 

 arsenate at the rate of 24 lb. per acre and then covered over, gave 

 quite as good results, both as regards the growth of the cane and the 

 absence of grubs, as did neighbouring plots treated with carbon 

 bisulphide. 



Fumigating a Plant Stove. — Gardeners' Chronicle, London, Ixii, no. 1610, 

 3rd November IDIT. p. 184. 



The best results are obtained when the houses are fumigated at 

 dusk and opened on the following morning, being tightly closed mean- 

 while, and several fumigation bowls being used to ensure an even 

 distribution. For green aphis one application of the following is 

 sufficient : sodium cyanide \ oz. ; phosphoric acid | oz. ; water h oz. 

 for each 1,000 c. ft. This will not scorch any plant. For black or 

 white aphis, thrips and scale-insects, one application of the following 

 will suffice : sodium cyanide } oz. ; phosphoric acid \ oz. ; water 1 oz. 

 for each l.OOO c. ft. This will not scorch mature plants. For 

 mealy bug (Pseudococcus) and red spider (Tetranyc/ius) in a house of 

 mixed plants, sodium cyanide 1 oz. ; phosphoric acid 1 oz. ; water 

 4 oz. for each l.OOd c. ft. should be used. A few of the young shoots 

 may be affected by this, but only to a very slight extent. 



Damage to Wheat-stacks by Mice. — Jl. R. Soc. Arls, London, Ixv, 

 no. 3389, 2nd November 1917, p. 830. 



While the whole world is in urgent need of wheat, it is being wasted 

 in Australia owing to the lack of transport necessitating its storage 

 for an indefinite period, during which it is attacked by mice, causing 

 a loss of 10 per cent., and bv weevils, which in some places do even 

 greater damage. 



Fletcher (T. B.). Icerya pxirchasi in Ceylon: a Warning to India. 

 — Agric. Jl. India, Agric. Research Institute, Pusa, Calcutta, xii, 

 pt. 4, October 1917, pp. 525-531, 1 pi. 



The fluted scale {Icerya purchasi) has obtained a firm footing in 

 Ceylon, where it first appeared on Acacia spp., spreading later to Citrus. 

 Steps are being taken to introduce its natural enemy, the Coccinellid, 

 Xavius cardinalis, the action of which may be supplemented by 

 spraying with red oil, lime-sulphur and kerosene emulsion sprays. 

 The only countries at present free from this pest are India, South 

 America and the West Indies. 



OsBORN (H.). studies of Life-Histories of Froghoppers of Maine. — 

 Maine Agric. Expt. Sta., Orono, Bull, no. 254, September 1916, 

 pp. 265-288, 13 figs. [Received 6th November 1917.] 



A list of the Cercopids occurring in Maine comprises : Aphrophora 

 paraUeh, Say, and A. saratogensis, Fitch, on pine ; A. quadrinotata. 

 Say ; Philaenus spumarius, L. ; P. lineatus, L. ; Lepyronia quadrangu- 

 Iciris, ^a.y, Philaronia hilineata, Sny ; Clastoptera ohtusa, Say, common 

 on alder ; C. proteus, Fitch, on dogwood; and C. xanthocephala. Germ. 



