176 



THE CANADIAN HORTICULTURIST. 



CORRESPONDENCE. 



GLASS PLUM. 

 The Glass Seedling Plum which I 

 received from the Association was eaten 

 down to the stump two seasons in suc- 

 cession, and afterwards made a strong 

 growth of about four feet and was the 

 only plum tree which stood the winter 

 of 1880-81 with me out of about 104 of 

 different varieties ; it has since made 

 a good growth, but has not yet borne 

 any fruit. The Prentiss Grape and Fay 

 Currant have both made a good growth 



London, Ont. ^' ^1^^' 



INSECTICIDES. 



Dear Sir, — I send you a paper con- 

 taining an article on an insecticide 

 called " Buhach." My reason for send- 

 ing it is, that I had not before seen any 

 reference to it in any of our horticul- 

 tural publications. And if there is any 

 better way of getting rid of insect 

 pests than we now know of it would be 

 an advantage to find it out. The insect 

 pests seem to be unusually bad this 

 3^ear. The hellebore is effectual for 

 the currant worm, but seems to have 

 no effect on rose bushes. My neighbor, 

 Mrs. Wade, says the aphis on her rose 

 bushes seem to gi-ow fat on it. The 

 latter are very bad on my rose bushes, 

 as well as the little white insect that 

 lodges on the under side of the leaf. 

 Latterly, I have been trying a weak 

 solution of Paris Green and carbolic 

 acid, but not long enough to know the 

 result. 



There is an insect powder sold by the 

 druggists here at 10 cents per ounce 

 (on enquiry, I was told a pound of it 

 would cost me $1), that is produced 

 from same species of plant that is re- 

 ferred to in the article above mentioned. 

 The druggist showed the description of 

 it in the U. S. Dispensator}^, where it 

 is called Pyrethrum anacylis, grown on 



Mediterranean Coast of Europe, &c. 

 That grown in California is called Py- 

 rethrum cinnerariafolium. It would be 

 interesting to us outsiders to have this 

 mentioned and discussed at some of the 

 meetings of the F. G. A. I humbly 

 suggest, and that is all I assume to do 

 in thus bringing the matter to your 

 notice. 



I have been spraying my plum trees 

 with Paris Green and carbolic acid. 

 A teaspoonful of former and about t^vo 

 tablespoons of the latter (the carboKc 

 acid is somewhere between the crude 

 and refined ), mixed in a pail of water, 

 and sprayed on with a large syringe. 

 I have only, on examination so far as 

 I could reach, been able to find but one 

 plum on each of three trees with the 

 mark of the curculio on it. One of my 

 trees is the Glass Plum, got from the 

 Association some years ago. It is now 

 a fine tree, some fifteen feet or so high, 

 and spreading in proportion. It is 

 loaded with fruit this year. It had not 

 borne any the previous two years, but 

 had a heavy crop in 1883; perhaps I 

 allowed it then to bear too heavily. 

 The fruit was very fine. 



The frost nipped the young leaf buds 

 of my Catalpa this spring, but it is now 

 throwing out vigorous shoots. My 

 dewberry, got this spring, is also shoot- 

 ing out nicely. Yours respectfully, 



Wm. Dickson. 



Parkhill, June 12th, 1886. 



Note by the Editor. — The Green 

 fly can be subdued by frequent syring- 

 ings with tobacco water, say twice a 

 week, until they disappear. White 

 hellebore, buhach, Paris Green, and 

 such like poisons, will have no effect 

 on green fly, in as much as they can 

 not be eaten by them, but the external 

 application of tobacco water will kill 

 them. 



