EXPERIMENT STATION BULLETINS. 317 



broadcast, and harrowed or dragged, rather than plowed in. Precautions 

 should be taken not to bring these chemical fertilizers into contact with 

 the roots of trees, as the results might be disastrous. 



L. K. TAFT. 

 Agricultural College, Mich., ) 

 March 1, 1892. \ 



INSECTICIDES AND FUNGICIDES. 



Bulletin No. 83; April, 1892. 



Page. 



Insecticides 317 



Injurious Insects 319 



Fungicides 321 



Fungous Diseases 323 



Diseases op the Small, Fruits 334 



Page. 

 Combined Insecticides and Fungi- 

 cides 336 



Where to Obtain the Materials 337 



Are Insecticides and Fungicides 

 Dangerous? 337 



Rusts and Smuts of Grain 334 Spraying Outfits 338 



While many of our largest and most successful fruitgrowers make free 

 use of insecticides and fungicides, in protecting their plants from destruc- 

 tion by animal or vegetable parasites, in many sections of the state little 

 attention has been paid to their use, and but slight knowledge is possessed 

 concerning them. 



Inquiries are so frequent, as to the best preparations to use, and the 

 methods of applying them, that this bulletin has been prepared in the 

 hope that it will furnish the ordinary farmer with such information as 

 will enable him to meet his enemies and conquer them. 



The statements concerning the habits of the insects and the character- 

 istics of the fungi, are well known to many persons, but are new to others,, 

 and are here given, as a knowledge of them is necessary to a rational 

 system of fighting them. 



Instead of giving the results of our experiments with insecticides and 

 fungicides, in the usual bulletin form, with tables, diagrams, etc., we shall 

 attempt to state our conclusions in a manner that may, perhaps, be fully 

 as clear. 



Most of the formulas recommended for the destruction of both insects 

 and diseases, have been thoroughly tried here, and the others have been 

 used with success by persons in whom we have the utmost confidence. 



INSECTICIDES. 



It is now some fifteen years since the arsenites began to be commonly 

 used for the destruction of injurious insects. The Colorado potato beetle 

 was about the first for which they were recommended, but so much has 

 been learned of the habits of insects, and of the best methods of fighting 

 them, that we now know that a large per cent. — perhaps more than half — of 

 our injurious insects can be destroyed by their use. 



