EXPERIMENT STATION BULLETINS. 375 



CELERY INSECTS. 



BY G. C. DAVIS 



Bulletin No. 102. — Entomological Department. 



Michigan is peculiarly a celery state. It no doubt has enough swamp 

 lands, of the peculiar muck soil, so requisite to the best success in celery 

 culture, to supply the whole country, and certainly will make use of them 

 largely for this appetizing plant in the near future. Every year brings an 

 increased acreage. When celery was first introduced and raised only in 

 limited areas, no insect attacks were ever reported, and probably none 

 occurred, as an introduced plant is seldom attacked for several years. As 

 several species acquired a liking for it, occasional reports of injury would 

 be received. The past two or three years, the species that attack celery 

 have so greatly increased in numbers and severity that the calls demanded 

 a more extended knowledge which would assist both professional and amateur 

 celery-growers to keep these little depredators in check by means of the best 

 remedies that could be suggested. So far as can be ascertained, only two 

 species have been reported in economic literature as celery insects. 



But little celery is grown at the college, and what has been learned has 

 been largely by frequent visits to the extensive fields at Kalamazoo, 

 Tecumseh, and Jackson, and through correspondence with some of the most 

 intelligent growers at these places. More might have been learned could 

 the fields and myself have been in closer proximity, but the most destruc- 

 tive species are briefly described, illustrated, and remedies given. Many 

 are spoken of that are not numerous at present but may be in the seasons 

 following. 



I wish to express my thanks to the members of the Board and the 

 Directors of the station for their generosity and assistance in making this 

 bulletin what it is, and to Mr. Russell of Tecumseh, and Mr. Wilson of 

 Kalamazoo, and the many other C("^lery growers at the various places 

 visited, for their ever ready assistance in the field work. I am also very 

 grateful to Mr. VanDuzee, Prof. Fernald, Prof. Osborn, Prof. Williams, the 

 department at Washington, D. C, Profs. Cook and Wheeler of this 

 college, and others who have so kindly assisted me in determining the 

 various material gathered. 



