Download Full PDF - 28.09 MB - The Society of Irish Foresters
Download Full PDF - 28.09 MB - The Society of Irish Foresters Download Full PDF - 28.09 MB - The Society of Irish Foresters
Notes and News 57strips, scattered blocks of forest but with intensive road networksallowing a good distribution of fertilizer dumps.In carrying out the operation two. hoppers are used. One isrefilled while the contents of the other are being distributed.The quality of aerial fertilization is reflected primarily in theuniformity with which the fertilizer is spread over the target area.Non-uniform distribution can lead to inefficient utilization of thefertilizer by the crop and to management difficulties later on as aresult of uneven growth of the trees. The problem of rapidlyassessing the degree of uniformity actually achieved in large-scaleoperations is being examined by the Research Branch of the Forestand Wildlife Service.PINE SAWFLIES AT FORTHMr. G. deBrit, Research Branch, Forest and Wildlife Service,Dublin, has supplied the following note:-In 1971, and probably in 1970 as well, there was a massive attackof the sawfly Diprion pini alt Forth fQ!rest, Co. Wexford. Theoutbreak collapsed this year probably due to predators andparasites of the sawflies. The crop attacked was of good coastalcontorta pine about 12m. high, in the thinning stage. This is, Ithink, the first serious outbreak in the country of this insect onIcontorta pine of this age and height. It normaIly confines itsattacks to trees from five to twelve years planted. The standsattacked were planted in 1933. Severe attack by D. pini over twoor three years can kill the trees and this has happened to someextent alt Forth. This is an contrast with atJ:acks by Neodiprionsertifer where trees are rarely kiHed, if ever. D. pini eats all Ithefoliage including that of the current year, while N. sertifer confinesits feeding to needles older than the current year's.At pres.ent N . sertifer is by far Ithe more abundant of the two inthis country. However, the fact that D. pini has demonstrated illsubllity to build up to damaging proportions is worrying. One hopesthat this is due to the dry warm weather experienced over the lastfew years, and not to a permanent ecological adaptation by theinsect.CASTLEWElJLAN ARBORETUMThe follwing note has been supplied by Mr. R. T. Sherwood,DIstrict Forest Officer, Castlewellan, Co. Down.In 1967 the Forestry Division of the Ministry of Agriculturepurchased Castlewellan Estate and included in that purchase wasthe aIready world famous" CastleweHan Gardens". The main work
58 Irish Forestryof starting and building up the collection was originally carried outby the 5th Earl of Annesley in the late 1800 s and it is thanks tothe interest and the sheer hard work of the Annesley family that thecollection survived and was in the excellent state it was when theForestry Division took over.From the outset it was the Ministry's intention, not only to;preserve the superb collection of trees -and shrubs hut, in factto extend it.At the time of acquisition the main Arboretum comprisedapproximately 20 acres. Following various planning meetings it wasdecided to extend the area to just over 80 acres. This was done,in the sense that the area has been delineated, some parts arehighly developed, some recently oleared of dense scrub and someunder mature hardwoods.At present Castlewellan comprises an extremely comprehensivecollection of conifers, hardwoods, woody shrubs. Of the latterrhododendrons are well represented. In addition there is a fairsized glass area in three sections, a water lily house, what is knownas the' long house', which itself is sub-divided into indoor tenderrhododendrons, an alpine section, and a general section. The lasthouse of the three is given over entirely to camelias.At the present time work is well advanced in catalogueing andrecording, not only by name but also by actual ground position,each specimen present.The final aim is to build up an international arboretum of outstandingtrees with emphasis on selection rather than collection.The" walled garden' section of the Arboretum is extremely wellpatronised by the visiting public and it is possible by prior arrangementonly, to take a limited number of parties on guided tours.COMING OF AGEThe well-known forestry and timber concern, Irish ForestProducts Ltd., has been .in existence for 21 years. To mark theoccasion a Garden and Leisure Display Centre at Glen 0' Downswas opened by the Minister for Agricucltu i'e, Mr. J. Gibbons, on30th September, 1972.PEAT-THE NEW RAW MATERIALUntil recently the very large Canadian peat deposits have beenused mainly as a soil conditioners. But now scientists, financed bythe National Research Council of Canada, have been investigatingother possible use for this material. Three such applications are:(1) effluent treatment, (2) industrial filtrations, (3) construction
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Notes and News 57strips, scattered blocks <strong>of</strong> forest but with intensive road networksallowing a good distribution <strong>of</strong> fertilizer dumps.In carrying out the operation two. hoppers are used. One isrefilled while the contents <strong>of</strong> the other are being distributed.<strong>The</strong> quality <strong>of</strong> aerial fertilization is reflected primarily in theuniformity with which the fertilizer is spread over the target area.Non-uniform distribution can lead to inefficient utilization <strong>of</strong> thefertilizer by the crop and to management difficulties later on as aresult <strong>of</strong> uneven growth <strong>of</strong> the trees. <strong>The</strong> problem <strong>of</strong> rapidlyassessing the degree <strong>of</strong> uniformity actually achieved in large-scaleoperations is being examined by the Research Branch <strong>of</strong> the Forestand Wildlife Service.PINE SAWFLIES AT FORTHMr. G. deBrit, Research Branch, Forest and Wildlife Service,Dublin, has supplied the following note:-In 1971, and probably in 1970 as well, there was a massive attack<strong>of</strong> the sawfly Diprion pini alt Forth fQ!rest, Co. Wexford. <strong>The</strong>outbreak collapsed this year probably due to predators andparasites <strong>of</strong> the sawflies. <strong>The</strong> crop attacked was <strong>of</strong> good coastalcontorta pine about 12m. high, in the thinning stage. This is, Ithink, the first serious outbreak in the country <strong>of</strong> this insect onIcontorta pine <strong>of</strong> this age and height. It normaIly confines itsattacks to trees from five to twelve years planted. <strong>The</strong> standsattacked were planted in 1933. Severe attack by D. pini over twoor three years can kill the trees and this has happened to someextent alt Forth. This is an contrast with atJ:acks by Neodiprionsertifer where trees are rarely kiHed, if ever. D. pini eats all Ithefoliage including that <strong>of</strong> the current year, while N. sertifer confinesits feeding to needles older than the current year's.At pres.ent N . sertifer is by far Ithe more abundant <strong>of</strong> the two inthis country. However, the fact that D. pini has demonstrated illsubllity to build up to damaging proportions is worrying. One hopesthat this is due to the dry warm weather experienced over the lastfew years, and not to a permanent ecological adaptation by theinsect.CASTLEWElJLAN ARBORETUM<strong>The</strong> follwing note has been supplied by Mr. R. T. Sherwood,DIstrict Forest Officer, Castlewellan, Co. Down.In 1967 the Forestry Division <strong>of</strong> the Ministry <strong>of</strong> Agriculturepurchased Castlewellan Estate and included in that purchase wasthe aIready world famous" CastleweHan Gardens". <strong>The</strong> main work
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