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Jdne 6, 1907. 



The Weekly Florists^ Review* 



u 



View at J. F. Rosenfield't Peony Farm, West Point, Neb. 



placed at our disposal for experimenting 

 and we have been conducting a series 

 of experiments at that place, which have 

 proven more or less satisfactory, al- 

 though we have not a detailed report 

 on them as yet. In other places florists 

 have tried our preparation with the 

 same success as Mr. Waite. In Louis- 

 iana, particularly, they have had most 

 satisfactory results in greenhouse work. 

 We expect to make a great many experi- 

 ments with some different insecticides 

 for greenhouse work in the next year 

 and shall be pleased if florists who ex- 

 periment with our products, as did Mr. 

 Waite, will reports results. 

 Ameeican Horticultural Disteibut- 

 INQ Co. 



Gas Too Strong. 



Many writers have recommended 

 hydrocyanic acid gas as a destructive 

 agent for white fly. The formula fre- 



quently given is: One pint of water, 

 one pint of sulphuric acid, and two and 

 one-half ounces of cyanide potassium, to 

 each 1,000 cubic feet of air. I made 

 a trial of it last week in one house and 

 am very thankful that I did not use it 

 in the others of my place. 



The house is 15x52, walls four feet 

 and ridge ten feet; a total of 5,460 

 cubic feet. I used the formula as above 

 in five lots and five jars placed in dif- 

 ferent spots through the house, allowing 

 a half portion in a sixth jar for the odd 

 460 cubic feet. I have not seen it 

 stated what should be the condition of 

 the house when the gas is liberated; 

 whether wet or dry. In my case, and in 

 the absence of information, the house 

 was dry. The ventilators were closed 

 and the white fly was treated to the 

 gas bath through the night. In the 

 morning there were no flies to be seen; 

 they had been sure enough killed; but 



the contents of the house were a sight. 

 Salvia and cosmos were all burned up. 

 Cockscomb was scorched and withered. 

 The leaves of geraniums were yellow on 

 the edges, and since have dropped. Ivy 

 geraniums were killed, and even spears 

 of grass in the benches were dried up 

 and withered. It was a pretty expensive 

 experiment for me, happening, as it did, 

 when the plants were all ready for the 

 market. 



Before I make further experiments 

 with hydrocyanic acid gas I am de- 

 sirous of learning why I met with such 

 disastrous results. Should the house 

 have been wetf If so, it would seem 

 that a very important part of the direc- 

 tions is usually omitted. That others 

 may not have my experience it would 

 seem desirable that the formula be over- 

 hauled and amended, for I am unable to 

 see in what particular I failed to follow 

 directions. W. J. A. 



View at J. F. RosenfieWi Peony Farm, Vest Point, Neb. 



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