374 INSECTICIDES, FrXOICIPES, AXP WEEP KILLERS. 



cent juice ; with a 2 per cent carbolized juice he only killed 80 per cent 

 of the caterpillars. 



Abraxas grossulariata, L. (magpie moth). — Soapy solutions of 

 tobacco juice free gooseberry bushes from the caterpillars of the magpie 

 moth. 



Conchylis ambignella, Hubn. (cochylis of the vine). — Nessler's 

 insecticides with a tobacco basis (formula No. 3) is perfect to destroy 

 the caterpillar of the cochylis. Zechini and Silva advise for the same 

 purpose their insecticide (formula No. 6). Jemina proposes his 

 insecticide (formula No. 7) to overcome simultaneously both the cochylis 

 and mildew. 



Hy2)onomeuta malinella, Zell. (small ermine moth of apple-tree). — 

 Sonnino praises 2 per cent carbolized tobacco juice. 



Pentatoma (Carpocoris) baccarum, L. (bug injurious to fruit trees). 

 — Taschenberg recommends to spread moist cloths in front of the fruit 

 walls, and to fumigate with tobacco between these and the walls as is 

 done in greenhouses. 



Eriocampa adnmbrata (slimy caterpillar, slug-worm). — Bach re- 

 cords the good effects of tobacco powder spread on the larvae. Tobacco 

 juice at the rate of 2 lb. of juice, with 14-5 per cent of nicotine in 10 

 gallons of water is regarded by Sajo and Czei'hati as an excellent 

 method of destroying the slug- worm. 



Nematus ve7itricosus, Kl. ; Emphytus Grossnlarice, Fb. (gooseberry 

 and cun-ant saw-fly). — To get quit of this insect Ahlisch advises spray- 

 ing with a liquor consisting of 2^ gallons of tobacco juice, 5 lb. of 

 soft soap, and 40 gallons of water. 



Lophyrtis pini (the pine saw-fly). — Sajo advises to destroy the 

 larva of the pine saw-fly by spraying with a solution of 2 lb. of tobacco- 

 juice containing 14-5 per cent of nicotine in 10 gallons of water. 



Diplosis rosiperda. — This rose cecidomia (fly), the larvae of which is 

 in the rose shoots, is fought in greenhouses by fumigation with tobaccO' 

 (Chittenden). 



Unprotected Plant Lice. — Plant lice are very sensitive to tobacco- 

 juice. A solution of O'l per cent of nicotine, say 1 per cent of strong- 

 tobacco juice containing 10 per cent of nicotine of the French State 

 factories, suffices to obtain a satisfactory i-esult. However, the nature 

 of the lice prevents this liquid from moistening them, and these sprayings 

 only reach a small portion. To remedy this drawback, it suffices to 

 dissolve in the nicotine solution 1 per cent of soft soap. Laurent advises 

 soft soap and carbonate of soda. In these conditions the liquid at once 

 reaches the lice, which die forthwith. The operation must often be re- 

 peated, especially, as is frequently the case, when the lice have made' 

 protective shelters by deforming the leaves, as is the case with the goose- 

 berry and peach louse. The soapy and alcoholic solutions (formuhc- 

 Nos. 3 and 4) are still better. 



Schizoneura lanigera, Hausm. (woolly aphis). — Nessler's solution 

 (formula No. 3) is advised for the destruction of this aphis. According 

 to the researches of Stedman it would follow in an irrefutable manner 

 that the woolly aphis extends its ravages to the underground part of 

 the apple-tree ; to completely destroy the aerial colonies the roots must. 



