FUNGUS GROWTH ON TREES 105 



As the spores of this fungus have been 

 found to grow freely on weeds and other 

 plants, its rapid distribution is readily accounted 

 for. When the fungus has made its appear- 

 ance in nursery ground, all fallen twigs and 

 leaves should be carefully collected and burnt. 

 Spraying with the Bordeaux mixture, or 

 a solution of copper sulphate, 4 Ibs. to 100 

 gallons of water, is recommended. 



The Sycamore Fungus (Rhytisma acerinum). 

 Attention has lately been directed to the un- 

 usual scarcity of the sycamore fungus in certain 

 districts during the past season, but, unfortu- 

 nately, the disappearance has been far from 

 general throughout the country. 



Everyone interested in trees must be familiar 

 with the conspicuous black, pitch-like spots 

 which so mar the appearance of sycamore 

 leaves at all seasons of the year, but particularly 

 towards the autumn. These are due to the 

 above-named fungus, which, appearing as 

 small yellowish spots on the under sides of the 

 leaves towards the end of June, gradually 

 increase in size and intensity of colour until 

 they attain to fully half an inch in diameter 



