First, is it desirable to completely kill the low value over-topping 

 hardwoods to release other trees of higher worth, or will a thinning out 

 cf the crowns, with partial killing only, bring about less abrupt changes 

 with equally good results? Second, is wood deterioration so severe as to 

 render the products of completely killed trees unusable from a quality 

 viewpoint? Third, is bark removal simplified and how soon can it be ac- 

 complished after treating? 



After one vear. where oak forms the overstory. white pine appears 

 to be developing normally with only a partial crown-killing of the oak. 



In a 25-year-old white pine plantation where 30 percent of the trees 

 have been killed, the crowns of the remaining trees are showing a good 

 lateral development. 



Red pine treated in July was attacked by wood borers during late 

 .summer. Birds, particularly woodpeckers, fed actively on the insects. 

 Sample trees were felled the following spring. About a third of the tree 

 was unfit for use but the lower two thirds was sound. The bark was very 

 loose, practically falling away from the wood. 



Grav birch. 3 to 6 inches in diameter, was treated in June. By early 

 winter the wood in the tops had deteriorated to such an extent that many 

 of the tops were broken during an early snow storm. It was found neces- 

 sary to slit the bark of birch from end to end of the cut bolts before bark 

 loosening took eft'ect. 



L. C. Swain 



OTHER ACTIVE PROJECTS 



Soil-Yield Relationships of White Pine 

 in Southern New Hampshire 



B. Huscn 



Marketing Forest Products in New Hampshire 



L. C. Swain 



Fruits 



(See Horticulture) 



Horticulture 



More Flowers for New Hampshire 



The compact, low-growing, late-blooming lilac from Korea described 

 in last vear's report has been named ]\Iiss Kim. Propagated plants have 

 been distributed to interested nurserymen. 



This year the Xew Hampshire Station assumed a national role in 

 the development of pure-breeding gladiolus through inbreeding procedures. 

 In addition to the gladiolus inbreeding being carried on since 1947 at this 

 station, an education program has interested other breeders throughout 

 the nation in starting similar work. 



All seedlings from second generation and backcrosses. involving the 

 wild Korean chrysanthemum and some of the good double-flowered va- 



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