260 



ELEMENTS OF AGRICULTURE 



SPRAYING FOR THE CONTROL OF INSECTS 

 AND DISEASES 



236. Common Fungicides and Insecticides. There are 

 two general classes of enemies for which treatment is given: 



Fio. 141. San Jos scale. Natural size on the left; much enlarged on the 

 right. A sucking insect. (After Howard and Morlatt) 



fungi and insects. Those materials that are used for de- 

 stroying fungi are called fungicides; those that are used 

 against insects are called insecticides. The following 

 list gives some of the chief materials of each kind: 



