317 



application of 2 lb. lead arsenate in 50 U.S. gal.s. ofjwater, or Bordeaux 

 mixture, hellebore, either as a spray or dust, and Black-leaf 40. The 

 CurcuUonid, Rhynchites hicolor, F., is generally controlled by hand- 

 picking, or lead arsenate sprays. As this weevil breeds largely in wild 

 roses, these should be destroyed in the vicinity of the garden . The moth, 

 Euclea inddcrmina , Boisd., is chiefly injurious in the southern States ; 

 the caterpillars, which feed on the lower surface of the leaves, are 

 usually picked off by hand (the picker wearing a glove), or they may be 

 spra\'ed with lead arsenate. 



LocHHEAD (W.). Inter-relations in Nature. — Scientific Agric, 

 Gardenvale, Quebec, i, no. 1, Januar\- 1921. pp. 19-2vS, 6 figs. 

 [Received 12th Apiil 1922.] 

 This paper points out and discusses briefly those inter-relations 

 in nature that have to do more particularly with insect hfe, including 

 those between insects and insects, insects and other animals, insects 

 and plants, including bacteria and fungi, and insects and inorganic 

 nature. Well-known examples of these are cited, such as parasitism 

 of the gipsy moth by other insects, the control of the citrus mealy-bug 

 [Psendococciis spp.] by the Coccinellid, Cryptolaemiis montrouzicri, 

 and the role of insects as disease carriers to both man and plants. 

 The responses of insects to various stimuli, such as light, gravita- 

 tion, heat, electricity, moisture, pressure, and chemical substances, 

 have only been studied comparatively recently, and afford a field 

 full of possibilities for the economic entomologist. In the future, 

 when knowledge of tropisms and their responses has ijicreased, many 

 modifications of present remedial measures may be introduced. 



Gibson (A.). Grasshopper Situation in the Prairie Provinces. — 



Scientific Agric, Gardenvale, Quebec, i, no. 1, Januarv 1921, pp. 

 23-24. [Received 12th April 1922.] 



The early campaigns against grasshoppers in Canada and the United 

 States are briefly reviewed. In Canada there was every prospect of a 

 serious outbreak in 1920 hi the Prairie,^Pr6vinces, but the definite 

 plan of organisation arranged by- the Provinces of Manitoba and 

 Saskatchewan, and the close co-operation of federal and provincial 

 officials, produced excellent results, and it is estimated that about 

 /3,400,000 was saved by the farmers by following their recommen- 

 dations. Enormous quantities of poison bait were used. Experiments 

 with chlorine gas indicated that the insects could be destroyed by 

 this method, but that it was too expensive for practical purposes. 



UocHHEAD (W.). The Story o£ Sprasdng Mixtures. — Scientific Agric, 

 Gardenvale, Quebec, i, no. 3, March 1921, pp. 113-115. [Received 

 12th April 1922.] 

 The outstanding events in the history of spraying mixtures are 



briefly reviewed, from the year 1860 to the present time, and a short 



account is given of the chief insecticides, fungicides and dusts used for 



poisoning. 



Fetch (C. E.). Spraying vs. Dusting. — Scientific Agric, Gardenvale, 



Quebec, i, no. 4, April 1921, pp. 171-172. [Received 12th April 



1922.] 



Experimental work in New York, Michigan, Illinois, Nova Scotia 



and Quebec shows that dusting is as efficient as spraying in the control 



