110 Mode of destroying the Woolly Blight. 



minatlon ; in other respects it is quite in the same manner as 

 mentioned by M. Lindegaard, in the volume and page above 

 quoted. 



Horticidtural Society's Garden^ Dec.^ 1839. 



The above is given exacdy as translated from the Danish by 

 M. Weilbach, a most intelligent young Danish gardener now 

 in England for his improvement, and who came to us strongly 

 recommended by the celebrated writer on botanical geography, 

 Professor Schouw. — Co?id. 



Art. III. An effectual Mode of destroying the A^phis latiigera, or 

 Woolly Blight, on Apple Trees. By N. T. 



There are many methods for destroying the mealy insect, 

 A^phis lanigera, on apple trees ; some of which are troublesome, 

 and some dirty ones. I here send you a more simple one ; 

 which you may perhaps think worth inserting in your Gardener's 

 Magaziiie. It is the brown impure pyroligneous acid ; which 

 may be had at the manufactory of this acid at a trifling cost. I 

 have an apple tree which was nearly destroyed by this insect: 

 by brushing it once over with the acid, about three or four 

 years ago, the insects immediately disappeared. A few days 

 after, some more made their appearance, which were perhaps 

 so protected in the cracks of the rough bark, that the acid had 

 not reached them. Having brushed these over, they have never 

 appeared since. 



This acid may also be applied, with the same effect, for the 

 destruction of all other insects on the stems and branches of 

 plants ; but it cannot be safely applied to those on the leaves or 

 flowers. For the destruction of these, the mixture [chiefly 

 tobacco water] in Vol. VI. for 1830, p. 553., may be used, which 

 is equally efficacious, as I had long experienced before I sent 

 you the receipt. It has been said, that tobacco water itself will 

 answer the same purpose; but I find it will not answer by im- 

 mersion, except when used hot, and it is more expensive; 

 whereas the other, in which a small quantity of tobacco water is 

 used, and the cost of the other ingredients is a mere trifle, may 

 be used either hot or cold, with the same effect. 



Jan. 11. 1840. 



i 



Art. IV. A Mode of destroying the White Bug in Hot-houses. By 

 W. Anderson, F.L.S., Curator of the Chelsea Botanic Garden. 



I KNOW of no better method to publish any thing of import- 

 ance in gardening, than through your widely circulating Gar^ 



