222 



Heavy infestations of army worms were also reported. The necessity 

 for concerted action and organisation among farmers for combating 

 these two pests is emphasised. 



The reappearance of the Hessian flly [Mayetiola destructor] is probably 

 due to the rapid increase in the acreage of wheat during the last few 

 years. No remedial measures suitable for Wisconsin conditions have 

 yet been found against the pea aphis [AcyrtJiosiphon pisi], which is 

 responsible for a loss of from 5 per cent, to 50 per cent, in some fields. 



Cotton (R. T.). Four Rhynchophora attacking Corn in Storage. — 

 Jl. Agric. Res., Washington, B.C., xx, no. 8, 15th January 1921, 

 pp. 605-614, 4 plates. 



The species dealt with ai^e an Anthribid, Araecerus fasciculatus 

 (coffee bean weevil), and the Curculionids, Caulophilus latinasiis 

 (broad-nosed grain weevil), Calandra {Sitophilus) oryzae (black weevil) 

 and C. (S.) granaria. The immature stages are described and 

 illustrated, and keys are given by which the various species may be 

 easily distinguished. 



Mills (R. R.). The Relation of Birds to Crops. — Agric. Gaz. Canada, 

 Ottawa, viii, no. 1, January-February 1921, pp. 69-71. 



The value of birds as destroyers of agricultural pests is emphasised, 

 and their protection is advocated. 



Tower (W. V.). Report of the Entomologist. — Kept. Porto Rico 

 Agric. Expt. Sia. 1919, Mavaguez, 15th October 1920. pp. 21-25. 

 [Received 8th March 1921. J 



Experiments in connection with the transmission of mottling 

 disease of sugar-cane by several species of leaf-hoppers, Pseitdococcus 

 sacchari (mealy-bug) and Diatraea saccharalis (moth borer) all 

 proved negative. 



Grape-fruit was heavily infested with thrips, but apparently no injury 

 resulted. 



CoRDLEY (A. B.) & Jardixe (J. T.). Department of Entomology. — 

 Ret>t. 1918-1920, Oregon Agric. Expt. St a., Corvallis, January 

 1921, pp. 59-63. 



Investigations were begun in 1919 in connection with the artificial 

 propagation and distribution of beneficial predaceous and parasitic 

 enemies of the apple leaf-roller [Tortrix argyrospila] and of apple 

 Aphids, and are still in progress. 



The prune root borer [Aegeria opalesens] causes an annual loss of 

 about £'8,000 in Oregon, but as a result of present investigations it is 

 hoped to reduce this by about 80 per cent. 



The ravages of Tortrix argyrospila and T. rosacea 7ia may be reduced 

 b}^ from 50 to 90 per cent, by means of oil sprays in April. Calyx 

 spraj^s of oil, lead arsenate and Black-leaf 40 killed about 33 per cent, 

 of the young larvae. Heavy oils give better results than light oils, 

 and the application should be made as near the hatching period as 

 possible. Earlier applications require a higher concentration of the 

 spray. 



