THE FLOEAL WORLD AND GARDEN GUIDE. 135 



used iu a rather damp state, will be found the best. The most 

 troublesome of any plants I find to cleanse of green-fly is the herba- 

 ceous calceolaria, and the most eftectual plan of smoking is to stand 

 them on inverted pots in a common garden frame shut up close, with 

 damp mats put on the glass to keep in the smoke. They will not 

 endure strong doses in this way, and. a lump of tobacco the size of a 

 bantam's egg will serve for an ordinary two-light frame. With the 

 plants standing on inverted pots the smoke plays around and under 

 the leaves, where the fly collects in the strongest force, much more 

 effectually than when standing on a shelf in the greenhouse. The 

 simplest and best way of burning tobacco for gardening purposes is 

 by using an iron heater: I have mine made about two inches over; 

 it is placed in the fire and made red-hot. A few potsherds are then 

 placed in the bottom of a flower-pot and the heater upon them. The 

 heater is then allowed to cool down for a minute or two, when the 

 tobacco is put upon it, and left to burn itself out, which it will do 

 more surely and slowly than by any other plan that can be adopted. 

 There is certainly no surer means of destroying green-fly than 

 tobacco smoke, when judiciously used. Tobacco paper, tobacco 

 cloth, and the tobacco tissue are all very good in their way ; but 

 they are equally as expensive, and less sure than tobacco in its 

 unadulterated and unaltered form ; in fact, for m.y own part, I would 

 rather use home-grown tobacco, when well harvested, than some of 

 the obnoxious trash sold for tobacco paper. 



Where it is not possible or convenient to use the tobacco in this 

 form for the destruction of greenfly, it is astonishing what repeated 

 syringings of clear water will do if followed up twice a day for a 

 week ; in orchard houses the fly sometimes appears, and where very 

 large, smokings would be rather expensive. In this case weak 

 tobacco water in which to dip the shoots of the trees attacked, with 

 greater diligence in the application of the syringe or garden engine, 

 will soon dispel them. In using tobacco amongst plants in the form 

 of smoke, this caution I deem to be necessary -. never use it if pos- 

 sible amongst any choice plants in flower ; although some will endure 

 it, the majority — the pelargoniums, for instance — will throw oflf aU 

 their expanded flowers as soon as the smoking is completed. 



Thrip. — For the destroying of thrip the remedy must be the 

 same as for the green-fly ; but they will not succumb so easily to the 

 effects of tobacco smoke. The best plan of proceeding is to collect 

 all the plants that are affected with it into a separate house, pit, or 

 frame ; and there smoke them every night for a week, during which 

 time keep them pretty close and warm. If the operation takes place 

 in summer, shade rather than give too much air. At the end of the 

 week gradually inure them to light and air, and keep the plants 

 constantly syringed twice a day for a month after ; at the end of 

 which time you may console yourself with the fact that the thrips 

 have perished. If a vinery should be seriously attacked with thrip, 

 wait until all the foliage and fruit are taken oft" the vines ; then 

 remove all kinds of plants that have green leaves into other houses, 

 fumigate repeatedly for ten days or so. As regards the subjects 

 mostly attacked by thrip, it is some consolation to know that their 



May. 



