ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 46 

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orders are called weather or climatic troubles Although these 

 ?roubL cannot be prevented, in many cases their detrimental 

 effects can be reduced by treatment. . , ^. , , • • ,_ 



Chemical Injuries—Various chemicals, including herbicides, 

 fungicides, insecticides, and fertilizers, may cause tree injury 



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Fi,. q (ton) -Girdling roots have killed some of the bark at the base of 



""^•^I ''".'■7hrto7o? the area from whkh the outer bark has been re- 

 i::T'^U^, r^otf may be'^so injurious that affected trees may show 



'''%t '''o'(''6„«";!,)*-Tr''eefused as posts for wire clotheslines or fences 

 are in many cases girdled and killed by the wire. 



