291 



" Five substances of the first class were tested, viz, lien manure, cow 

 manure, kerosene, carbolic acid, and bisulphide of carbon. None of 

 these proved practically successful. 



" Three substances of the second class were tested, viz, coal soot, 

 gypsum, and saltpeter. Of these coal soot and saltpeter proved 

 worthless, while ffyjisum shoAved one beneficial effect, not sufficient, 

 however, to saA^e the i)lants wholly. 



" Three substances of the third class were applied, viz, pyrethrum, 

 slug shot, and ' peroxide of silicates.' Pyrethrum killed those beetles 

 Avith wliich it came in contact when first applied, but soon lost its 

 efficacy. Slug shot 'injured the plants to Avhich it was applied. 

 Peroxide of silicates has a decided effect in preventing injury, and 

 where the ])lants had been well started before being attacked saved 

 them from destruction. But it did not save them Avhere beetles were 

 so luunerous tliat they burrowed doAvn to the sprouting plants. 



" The results obtained from the fourth method, that of fencing out 

 the insects by covering the plants Avith some form of tent or gauze- 

 coA'ered frame, Avere by far the most satisfactorA'. The cheapest and 

 most successful method employed is that of protecting each hill by a 

 ]Diece of plant cloth or cheese cloth about 2 feet square. This may be 

 done by simply placing it over the plants and fastening the edges 

 doAvn by small stones or loose earth. It is better, hoAvever, to hold it 

 up by means of a half barrel hoop or a Avire bent in the form of a 

 croquet arch." 



Third contribution to a knowledge or the life history of 



CERTAIN LTTTLE-KNOAVN PLANT IJCE, C. M. WeED. ISI. S. (pp. 148- 



152). — Notes on the straAvberry root louse {Aphis forhesi, N. S.), and 

 the grain plant louse {Siphonophora arena'). 



Notes on so.me little-known, injurious insects, C. M. Weed, 

 M. S. (pp. 153-156), (illustrated). — The insects included in this 

 report ai-e a snout beetle {Lixus concavus. Saj^, the imported currant 

 worm {Xematds vcntri(:osvs),{\i(i green apple-leaf hopper {Typlocy'ba 

 ulhopicta) ^ the rose-leaf hopper {Tyjdocyha ro'^a^), and the cherry- 

 tree slug {Sdandria eerasi). 



An experi.aient in preventing the in.juries of the potato rot 

 (Phytot'hthora infestans), C. M. Weed, M. S. (pp. 157-169). — 

 Details are given and the residts are sunuiiari/ed and illustrated by 

 diagrams. 



"(1) The exi)erinu'ut was uiiderlakt'n io (Ictcrniiiii' Avliat effect the 

 application of a solution of sulphate of copper and lime (known as 

 the Bordeaux mixture) to the foliage of potatoes would have in pre- 

 venting the injuries of the potato rot, aud Avas conducted at the 

 Station. 



"(2) Fifteen feet at the end of each tAventy rows of potatoes Avere 

 sprayed with the Bordeaux mixture four times, viz, May 28, June 6, 

 June 29, and July 16. Four varieties were included iji the experi- 

 ment, viz, Early Ohio, Early Oxford, Puritan, and Lee's Favorite. 



