BULLETIN 



OF THE 



Ohio Agricultural Experiment Station 



Number 198. November, 1908. 



SPRING PRACTICE IN ECONOMIC ZOOLOGY. 



BY H, A. GOSSARD. 

 PREFACE. 



'he present compilation is the second num- 

 ber of a series of Manuals of Economic 

 Zoology, to be issued in four numbers cor- 

 responding to the four divisions of the year. 

 The Winter Manual was issued in 1905;the 

 Summer and Autumn compends will follow within the coming year. 

 The present number is the most important one of the set. 



The tables for general treatment of fruits have been made to 

 cover the entire year, since it would be practically impossible to 

 make them conform to exact time limitations. Professors Selby 

 and Green have kindly assisted in preparing the tables from the 

 standpoint of fungicides and practice, and these may therefore be 

 regarded as summing up the best experience and knowledge of the 

 Station officers. Practically the same matter is furnished in the 

 spray calendar, the chief difference being that the tables are some- 

 what fuller from the entomological standpoint. For information 

 concerning spray formulae, .etc., see the spray calendar, Bulletin 199. 

 The time schedules assigned for work, and the appearance of 

 the various insects, must be regarded as only approximate and 

 subject to considerable variation because of weather conditions, 

 latitude, etc. The periods of expected appearance for the insects 

 mentioned will be found approximately accurate for central Ohio in 

 average seasons. Southern Ohio should look for them a little 

 earlier, and northern Ohio, a little later than the dates given. The 



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