262 A MANUAL OF FORESTRY. 



The seed ripens in September to October, and falls in 

 October, and into the winter months. The germinating 

 power disappears rapidly after the following spring. 

 Good seed should show a germinating percentage of at 

 least 55. One pound of seed of Sycamore contains about 

 5000 seeds, of Norway Maple somewhat more. 



The best plan consists in bedding the seed, as in the 

 case of Ash and Hornbeam, sowing it in drills in the 

 spring, as soon as it shows signs of germinating; the 

 seed should be covered at least to a depth of f of 

 an inch, but 1 J inch is not too much. The cotyledons 

 appear in that case after about two weeks, if the 

 weather is warm. Seed kept over winter and sown in 

 spring germinates after 4 to 6 weeks. The seedlings 

 may be removed into nursery lines when one year 

 old. 



Maple is generally planted out in pits. 



i. Tending. 



Maple, while young, requires some protection against 

 late frosts. 



Maple is browsed by deer, also sometimes peeled, 

 but it is little injured by insects. The seedlings 

 are sometimes destroyed by wireworm. The roots of 

 saplings may be attacked by chafer-grubs, whose images 

 may defoliate the tree, as well as the Iarva3 of Acronycta, 

 aceris. Zeuzera cesculi will kill young trees. 



Fungi are of little importance. The black spots on 

 the leaves are due to Rhytisma acerina. Pliytoplitliora 

 omnivora sometimes kills young seedlings. 



Mistletoe is found on Maple. 



