June 26. 1920 



HORTICULTURE 



513 



MAY CONTROL CHRYSANTHEMUM 

 MIDGE 



Greenhouse Owners and Others May 



Use Measures Worked Out by 



United States Department 



of Agriculture 



The Chrysanthemum midge entered 

 the United States from Europe a few 

 years ago and is now an established 

 greenhouse pest, says the United 

 States Department of Agriculture. It 

 was first reported in this country from 

 iMic-higan and is now known to be 

 present in more than twenty States 

 and in Canada. It is regarded as one 

 of the most important pests to be 

 reckoned with by chrysanthemum 

 growers. 



While principally a greenhouse pest, 

 it occurs on outdoor plants even as 

 far north as Ottawa. Canada. The 

 injury to badly infested plants is such 

 as to destroy their value for com- 

 mercial puriroses. In the tender por- 

 tions of the plant are laid the eggs 

 from which tiny maggots hatch. The 

 maggots then bore their way into the 

 plant tissues thereby causing galls. 

 Apparently, this midge was brought 

 to America without Its quota of para- 

 sites and it is not yet certain that 

 native parasites of gall midge fauna 

 are preying upon it effectively. 



Control Measure Worked Out 



Many experiments have been con- 

 ducted by the specialists of the de- 

 partment in working out control 

 measures. The results are summar- 

 ized as follows in Department Bulletin 

 No. 833, just issued: 



"From the life history, as well as 

 from the experimental data thus far 

 submitted, it Is clear that certain 

 points must be kept in mind to secure 

 the best practical results. First, there 

 are always several generations pres- 

 ent in greenhouses during the spring 

 and fall occurrences; second, the 

 adults emerge and mate during the 

 very early morning hours, and egg lay- 

 ing quickly follows; third, preliminary 

 control experiments show that the egg 

 stage may be controlled by means of 

 spraying or dipping the cuttings or 

 plants; fourth, it has been demon- 

 strated that the adult can be killed 

 easily at the time of emergence by 

 consistent spraying; fifth, fumigation 

 experiments in a commercial bouse 

 proved that the adult is easily killed 

 by fumigating either with nicotine 

 papers or hydrocyanic-acid gas; sixth, 

 experiments applicable to general 

 propagation practices show conclu- 

 sively that such measures ofi'er a 

 reasonable safeguard and protection 

 against doubtful stock and Infested 

 material without Injury to the plants. 



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Cosmos, Caiidrtiift, Snapdrscon. Lobelia. 



Phlox, Scabloaa, OypaophUa. 



BITLBS — OladioU, Cannaa, Tnberoaei, Caladliuns, Pahilaa. 



Anemonei, Hadalm Tlnei, Clniia^om VlB^a. 

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Insect Readily Controlled 

 "By adherence to a definite control 

 program, involving any of the above 

 cited mea.sures, either singly or in 

 combination, the insect can be readily 

 controlled." 



The bulletin is a complete technical 

 discussion of the chrysanthemum 

 midge. Copies may be had on appli- 

 cation to the department by oersons 

 interested in chrysanthemum culture. 



are in good condition, and some of 

 them are exceptionally good. 



The display Is well worth a visit, 

 and all visitors may be assured a 

 hearty welcome by those in charge. 



The Minneapolis Rose Garden is one 

 of the test gardens of the American 

 Rose Society. 



Yours very truly, 

 TiiKOBORE WiRTH, Superintendent. 



ROSE DISPLAY AT MINNEAPOLIS 

 Dear Sir: — Members of the Ameri- 

 can Rose Society, and In fact all rosa- 

 rlans and lovers of roses, are invited 

 to visit the Minneapolis Rose Garden 

 at Lyndale Park, Monday, June 28, 

 when It is expected that the Garden 

 will be at its best. 



The severe winter resulted In the 

 loss of a good many plants, and the 

 Garden Is not as attractive as In 

 former years, but most of the plants 



COMING EVENTS 



Bcisldii— American Sweet Pe.T Society, an- 

 nual e.\hlbltlon, July 10 and 11. Sec'y, 

 Win. Gray. Bellevue ave., Newport, R. I. 



Cleveland. — S. A. F. and O. H. annual con- 

 vention. Aug. 17, 18, 19. Sec'y, John 

 Young, 43 W. 18th St., N. Y. 



New York. — American Dahlia Society, an- 

 nual exhibition, Pennsylvania Hotel, 

 Sept. 27. 28. 2f>. Sec'y, E. C. Vick. 205 

 Ellwood ave.. Newark. N. J. 



iDdianapolls.— Florists' Telegraph Deliv- 

 ery, annual convention, October (second 

 week). Sec'y, Albert Pochelon. 153 Bates 

 St., Detroit, Mich. 



New York. — Chrysanthemum Society of 

 America, annual exhibition, American In- 

 stitute, Not. 3, 4, 5. Sec'y, Wm. A. 

 Eagleson, 324 W. 23rd St.. N. Y. 



