WEEDS AND FUNGI 



plant good strong plants ; to form mixed woods so that trees 

 liable to attack are isolated, especially mixing broad-leaved 

 trees with conifers ; to keep woods in a clean state by having 

 timely thinnings ; and to prevent wounds being formed in 

 standing trees. Special measures which may be taken in 

 certain cases are : Isolation of attacked plants by trenches ; 

 the cutting down and removal of diseased trees ; pruning and 

 burning of attacked branches ; and the spraying of diseased 

 young plants with fungicides. 



Fig. 9. Eight-year-old Scotch pine killed by A. mellea, Vahl. a Sterile 

 rhizomorphic strands, b and c Fertile ditto ; some of the fructifications 

 are abortive, d Fructifications springing from mycelia under the bark. 

 (Reduced.} 



The Honey ftmgtis (Armillarea me lie a). 



This fungus is one of the most destructive to young conifer 

 plantations. When the tree is attacked the needles become 

 yellow and gradually dry up and fall, the base of the stem 

 swells up, the bark peels off and turpentine exudes in 



1369 



