1884 



ENCYCLOPEDIA OF PRACTICAL HORTICULTURE 



CompatiMlity of Insecticides and 

 Fungicides 



Geo. p. Gray 

 University of California 



The cost of spray materials is no small 

 item, Mt is usually insignificant as com- 

 pared to the cost of application. One 

 •way of reducing the latter expense is hy 

 combination spraying, that is, by mixing 

 two or more spray materials and apply- 

 ing them together. In mixtures of this 

 sort grave chemical changes may take 

 place which render the mixture wholly 

 unfit for use. On the other hand, the 

 original ingredients may remain un- 

 changed or may he improved by their 

 new associates. 



Numerous experiments have been made 



to determine the advisability of combi- 

 nation sprays, and the results have been 

 published in the bulletins of the United 

 States Department of Agriculture, the 

 state experiment stations and in agricul- 

 tural journals. These reports are scat- 

 tered through so many publications, and 

 the conclusions are at times so conflict- 

 ing, that no inconsiderable amount of time 

 must be spent in a search of the litera- 

 ture to arrive at a definite conclusion 

 as to the suitability of applying some 

 particular remedy in combination with 

 another. 



In order to bring this information into 

 more available form and of more easy 

 access, it has been condensed into the 

 form of a compatibility table. 



CompataMIity Table—Insecticides and Fungicides 





Fungicides 



Contact insecticides 



Alkalies 







Bor- 

 deaux 



Lime- 

 sulphur 



Iron 

 sulfid 



Cyamd 

 fumiga- 

 tion 



Tobacco 



Soaps 



Emul- 

 sions 



Acids 



stomach poisons (arsenical)- 



Paris green,.; 



Calcium arsenite 



Lead arsenate (acid) 



Lead arsenate (neutral) 



Zinc arsenite. 



A-1 



A 

 A-1 



A 



? 



? 

 ? 



A-1 or B 



CorD 



D 



D 

 B 



D 

 D 

 ? 



B 

 D 



"*D*"* 

 C 



A 



A 



C 

 C 



A-1 



A 

 A-1 



A 

 A-1 



"*c'" 

 c 



A' 



D 

 D 



D 



A 



"a" 



? 



A 



A 

 A 

 A 



A 



A-1 

 A 



D 

 D 

 D 

 A 

 D 



C 



A 



'"a"" 



D 

 D 

 D 



A 

 D 



D 



" ■ A * ■ 



A-1 



D 

 D 

 D 



A 

 D 



C 

 D 



A 

 AorB 



D 

 D 

 C 

 D 

 D 



Contact insecticides: 



Lime-sulphur . . , 



C 



Emulsions 



Soaps 



Tobacco 



Cyamd fumigation 



D 

 C 



A 



Acids 













C 





Alkalies 





. ... 



,. .. 





A-1 Better results by mixing. 



A Proi>ertaes not changed by mixing. 



B Effiwttt, non-iiyurious. 



C Ineffident, non-injurious. 



D Bangerous mixtures. 



KEY TO CLASSIFICATION 

 [Compatible. 



[Incompatible, chemically. 



Definitions 



The word "compatibility" or its oppo- 

 site ^Incompatibility" may seem odd as 

 used in this connection, but it seemed 

 to be the best word that presented itself 

 to be applied in the sense to be later de- 

 scribed. "Incompatibility of tempera- 

 ment" is a phrase often seen in the news- 

 papers and its meaning may be described 

 as a state of affairs in which trouble is 

 precipitated whenever two opposing 

 tempers come in contact. Incompatibil- 



ity is the state of being incompatible. In 

 pharmacy, the terms are often used, and 

 usually a whole chapter is devoted to the 

 subject in works on the practice of phar- 

 macy. As applied to medicine, incom- 

 patibility is of three different types and 

 may be defined as follows; 



Incompatible 



(1) Chemically—Not capable of being 

 united in solution without liability to de- 

 composition or other chemical change. 



(2) Therapeutically— Not suitable to 



