MANAGEMENT OF DECAYING TREES 43 



The goat and wood leopard moth, by tun- 

 nelling into the stem and branches, render 

 the trees, particularly young specimens, 

 liable to snap across at the point where the 

 grub entered; and in our London parks and 

 gardens young Thorns, Chestnut, Poplar, the 

 Beam tree, and other species of Pyrus have 

 suffered greatly in this way. As before stated, 

 by placing a small quantity of cyanide of 

 potassium in each tunnel, the insect will 

 quickly be got rid of. 



The Elm tree destroyer forms galleries be- 

 neath the bark, usually of Unhealthy trees, and 

 can only be kept in check by carefully burning 

 all infected specimens. Of late we have noticed 

 Beech trees both in urban and suburban dis- 

 tricts of London attacked by the Beech Coccus 

 (Crypto coccus fagi), an insect that is alarm- 

 ingly on the increase in this country. Paraffin 

 or petroleum emulsions will destroy the in- 

 sects; and scrubbing affected parts with a 

 brush and soft soap is to be recommended. 



FUNGI ON TREES. These are certain signs 

 of decay or the bad condition of a tree. 



