JULT 21, 1910. 



The Weekly Florists^ Review^ 



5 



A COMPLICATION OF DISEASES. 



I am sending you six rose leaves, each 

 of which is attacked with a different 

 • lisease, and I should like to know what 

 the diseases are and what is the treat- 

 ment for them. I have classified them 

 ))y numbers, 1, 2, 3, etc. No. 1 is a yel- 

 lowish-green leaf, with small, black, dry 

 hlotclies scattered over the surface, 

 which is greenish around the blotches. 

 A'o. li is a leaf eaten out on the side. 

 No. 3 is brownish, with small red spots. 

 \o. 4 is reddish around the edge, on 

 top of the leaf. No. 5 is a yellow leaf. 

 No. 6 has a black, dry spot in the mid- 

 dle. W. R. 



Leaf No. 1 is affected with black 

 spot, a fungous trouble rather prevalent 

 at this season, especially in houses which 

 arc inclined to be too damp and moist. 

 Though possibly not generated by these 

 conditions, it is in just such situations 

 that the spores germinate and grow 

 rapidly. Nos. 3 and 6 also are affected 

 with the same trouble, although in a 

 different stage. Remedy: Pick off all 

 affected leaves and burn them; give 

 l»lenty of ventilation and keep on a 

 few inches of air at night; keep the 

 atmosphere as dry as is consistent with 

 the health of the plants and scatter 

 some quick lime under the benches. 

 This trouble will probably disappear as 

 the plants get stronger. 



No. 2 has been attacked by the larva; 

 of the rose-leaf saw-fly, or Hylotoma 

 vosffi. This species is frequently quite 

 destructive and ought to be exter- 

 minated with all possible epeed. Rem- 

 edy: Take one pound of brown sugar 

 ind one ounce of Paris green; mix when 

 •u the dry state until they are thor- 

 oughly incorporated, then add to each 

 Dound of the mixture ten gallons of 

 •vater; spray the foliage with this twice 

 I week. The mixture can be used much 

 -tronger than this if a small piece of 

 !ime is added to neutralize the caustic 

 Toperties of the arsenic. This, of 

 ' ourse, only destroys the larvae. 



To kill the j»erfect insect, or saw- 

 rty, use pyrethrura powder, or buhach, 

 m a fresh condition. This can be dis- 

 tributed with the sulphur blower, say 

 twice a week, taking care to have it 

 reach every part of the house, espe- 

 ("ially under the benches and wherever 

 there are likely to be ground weeds. 



No. 4 shows evidence of scalding, and 

 this would indicate a close, moist at- 

 mosphere and deficient ventilatton at 

 'light. There is also mildew present in 

 the house. This should be remedied by 



SES 



a free distribution of the flowers of 

 sulphur. 



AH of the samples show the effects 

 of being attacked by thrips. These in- 

 sects can do a great amount of dam- 

 age when the plants are in flower and 

 should be exterminated at once. 

 Cayenne pepper burned in the house is 

 one of the surest remedies, and it can 

 be used in quantities without harming 

 the plants. One pound to each 1,000 

 cubic feet of space would be about 

 right. This can be done twice a week, 

 choosing a cool, moist evening for the 

 operation and leaving the ventilators 

 closed till morning. Ribes. 



BOSE BUST. 



"What remedy can you give for rose 

 rust on outdoor roses? How should 

 affected plants be treated? C. D. W. 



The best remedy for rose rust, or 

 Phragmidium mucronatum, is to care- 

 fully gather all the affected leaves and 

 burn them. 



As a preventive, a liberal dusting 

 with Fostite twice a week will help 

 materially. This can be applied in the 

 dry form by the sulphur distributor, or 

 it can be applied in the liquid form 

 with the sprayer. One-quarter pound to 

 five gallons of water is sufficiently 

 strong if applied twice a week. 



Ribes. 



CONVENTION PBOOBAM. 



The Rochester Meeting. 



The following is the preliminary pro 

 gram of the twenty-sixth annual meet 

 ing and exhibition of the Society of 

 American Florists, to be held in Rocli 

 ester, N. Y., August 16 to 19, 1910: 

 TUESDAY, AUGUST IG, 1910. 

 Opening Session. 



2:00 P. M.— Address of Welcome, H. U. 

 Edgerton, Mayor of Rochester. 



Address of Welcome, Geo. Dietrich, President 

 of Chamber of Commerce. 



Response, Roliert Craig. 



President Plerson's Address. 



Reports of Officers, Committees, etc. 



Report of Committee on President's Address. 

 Discussion. 



Miscellaneous Business. 



Judging of Trade Exhibits. 



Evening Session. 



7:30 P. M.— President's Reception. 



WEDNESDAY, AUGUST 17, 1910. 

 Morning Session. 

 9:30 A. M. — "Use of Cement with Especial 

 Reference to Greenhouse Construction," Edward 

 1). Boyer, Cement Expert, Atlas Portland Ce- 

 ment Co. 



Discussion. 

 "Value of Experiment Stations to Ornamental 

 Horticulture," W. N. Rudd. 

 Discussion. 

 11:00 A. M.— Selection of Next Meeting Place. 

 Nomination of Officers for 1911. 

 Report of Judges of Trade Exhibit. 

 Annual Meeting Ladies' Society of American 

 Florists at Seneca Hotel. 



Afternoon Session. 

 2:30 P. M.— "Retail Florists' Association," 

 J A. Valentine. 



Discussion. 

 "The National Flower Show," Wm. J. Stewart. 

 Discussion. 

 Evening Session. 

 8:00 P. M.— Illustrated Lecture, by John Dun- 

 bar, Assistant Superintendent of Parks, Roches- 

 tor, N. Y. 



9:00 P. M.— Ladles' Reception at Senecu 

 Hotel. 



THURSDAY, AUGUST 18, 1910. 



Morning Session. 

 9:30 A. M. — Sectional Meetings: 

 Retailers' Section. 

 American Carnation Society. 

 .Vmerlcan Rose Society. 

 National Sweet Pea Society. 

 Florists' Hall Association. 

 Gladiolus Society. 



11:30 A. M. — Election of Officers— Polls to re- 

 main open two boars. 



Afternoon — No Session. 

 Bowling Contest and Other Sports. 



Evening Session. 

 .S:00 P. M. — Symposium on Greenhouse Heat 

 ing — Spealcers to be announced later. 

 Discussion. 



FRIDAY, AUGUST 19, 1910. 

 In tlie hands of the Rochester Florists' Club. 



WMM 



BLACK APHIS ON FEBNS. 



I have about forty Cibotium Schiedei 

 ferns to look after, which were attacked 

 with the black aphis when turned over 

 to me. How can this aphis be removed, 

 or, in other words, what is the best 

 thing to add to the water when washing 

 them? Then, later, what can the plants 

 be sprayed with in order to prevent any 

 further trouble with this pest? 



The plants, in pots from 5-inch to 

 10-inch sizes, stand elevated on pots 

 and stands in a well ventilated little 

 house, which is shaded with whitewash 

 on the outside and cheesecloth on the 

 inside. How often is syringing with 

 clear water beneficial? E.G. 



Black aphis may be destroyed by fu- 



migating with nicotine paper, but the 

 young fronds of Cibotium Schiedei are 

 rather susceptible to the effect of the 

 smoke, and the tips of fronds that are 

 just exp|anding are liable to be some- 

 what injured. Try spraying with a solu- 

 tion of nicotine extract, one teaspoon- 

 ful to a gallon of water, afterward 

 shaking off the surplus of the solution 

 from the young fronds. The mature 

 fronds would not be injured by either 

 the smoke or the solution, but care is 

 needed to save the growing tips. 



Syringing with clear water is not 

 often required by cibotiums, except in 

 extremely hot and dry weather, and 

 under such conditions of weather a 

 light syringing each day will do no 

 harm. W. H. T. 



