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Ai'ousT 8. 1007. 



The Weekly Florists' Review* 



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The adult tlirips are hardier and, being 

 winged and more active, spring and fly 

 away, and are thus not so easily 

 l)rought in direct contact with insecti- 

 cides like kerosene emulsion. The white 

 flies, on the other hand, are more sus- 

 ceptible to poisons while in the active 

 adult stage. The nymphs are of firmer 

 consistency and comparatively resistant. 

 Remedies for the greenhouse white fly 

 are described in Circular No. 57, of the 

 IT. S. Department of Agriculture and 

 are worth careful study by every 

 grower. 



A later method of applying the to- 

 bacco extracts is to spray them with a 

 fine mist, after diluting in water to a 

 point where the cost is not great and 

 safety to stock is insured, while at the 

 same time the nicotine-laden mist de- 

 stroys the thrips, etc. 



W. P. Craig'* Nephrolepts Amerpohlii Grown by the Robert Craig Co. 



is interesting to note that instead of 

 pinching a ])lant and growing it to three 

 flowers, two late struck cuttings are be- 

 ing planted close together, the idea be- 

 ing to grow two large flowers each to a 

 single stem instead of three flowers of 

 medium size. Jt costs a little more in 

 propagating and growing the plants in 

 pots, but the flowers will bring more. 

 Better try it. Robert Craig is doing it. 

 Eugene Dailledouze is doing it. 



Otaheite oranges were fine, full of 

 fruit. Pandanus Veitchii is being grown 

 in large numbers to offer in medium 

 sizes. Begonia Gloire de Lorraine is 

 coming along nicely. Thousand Beauties 

 is planted out for stock. Adiantum hy- 

 bridum is having a lively run. ' ' The 

 best one for cutting sprays," Mr. Craig 

 says, and now they know how to propa- 

 gate it. Do youf Phil. 



TOBACCO IPl GREENHOUSES. 



Vaporiiing and Fumigating. 



In the vaporization of tobacco — a 

 practice which has been in use since 

 about 1894 and which has largely super- 

 seded ordinary dry-tobacco fumigation 

 in many sections — tobacco stems are 

 placed in a kettle, metal pail, or sim- 

 ilar receptacle. A hose is then connect- 

 ed with a steam pipe, the nozzle in- 

 serted in the receptacle, and the house 

 to be treated becomes saturated with 

 the vapor of tobacco, with the resulting 

 destruction of aphides and other soft- 

 bodied insects that may be present, such 

 as thrips or white fly. 



Liquid preparations are generally 

 evaporated over alcohol or other lamps, 

 or are placed upon steam pipes, or hot 

 irons are put into the receptacles. For 

 general greenhouse fumigation, fumi- 

 gating powders are placed in shallow 

 pans, and a few drops of kerosene are 

 added to facilitate ignition. The dry 

 fumigant is designed to burn slowly, so 

 as to produce a smudge which, when 

 dense, is fatal to aphides. This process 

 of treatment may be applied at any 

 time, by day or over night, and upon its 

 completion the house is ventilated. In 

 some eases the plants are syringed, but 

 care is necessary, for a surplus of 

 moisture is to be avoided, owing to the 

 liability of inducing spot, mildew, and 



other fungous diseases on plants sus- 

 ceptible to such maladies. 



The amount of a tobacco compound 

 to be used depends upon its strength, 

 the plants to be treated, and the size 

 of the greenhouse. Several forms are 

 for sale under different trade names, 

 and there is much difference in their 

 strength. They are put up in both dry 

 and liquid forms. In experiments con- 

 ducted on greenhouse cucumbers at the 

 Massachusetts .Agricultural Experiment 

 Station, at Amherst, one of these prepa- 

 rations has been used successfully at 

 the rate of five or six teaspoonfuls to 

 one and one-half j)int8 of water, and 

 vaporized in a space of about o,00() 

 ^ubic feet. The length of exposure in 

 this case was over night. Thus used, 

 it does not injure delicate plants, like 

 cucumber, but it kills all aphides and 

 nearly all thrips — for which it was used 

 primarily and which are not infrequent- 

 ly associated with aphides on the plants 

 to be treated. 



Thrips and white fly are more resist- 

 ant to poisonous gases than are aphides. 

 The former are most effectively destroy- 

 ed while in the soft, immature stages. 



PALMS. 



The approach of the busy season for 

 liio j)lantsmen shows that the market for 

 palms will be in fully us strong a posi- 

 lion as last year, when i)rices showed an 

 advance from twenty per cent to thirty 

 per cent over the preceding season. It 

 is far from being a case of no palms 

 to be had, for some of the growers who 

 lu'w to the same line season after season 

 have fully as large stocks as ever, and 

 some of the far-sighted ones have in- 

 creased their supply. But many who 

 grew palms in quantity a few years ago 

 have dropped out of this line, until the 

 supply is not nearly as great, by com- 

 parison with the present outlet, as it was 

 a half dozen years ago. The smaller 

 sizes of kentias, such plants as will 

 wholesale for 75 cents, .$1, or $1.25, are 

 especially short, both in tliis country and 

 in Kurope, where many of the ])alm spe- 

 cialists of a few years ago have gone 

 into other lines. 



It is interesting to note that a con- 

 siderable number of the houses once 

 given to palms by those who made them 

 a specialty, are now given to ferns of 

 the Boston varieties, but a number of 

 these growers are talking either of cut- 

 ting down the fern department to make 

 additional room for palms, or else of 

 building new houses to reenter the palm 

 industry. The result will be that prob- 

 ably in two or three years there will 



House of Dracaenas Grown by the Robert Gaig Co., Philadelphia. 



