The Forester: A Practical Treatise on British Forestry and Arboriculture for Landowners, Land Agents, and Foresters, Volum 2W. Blackwood and Sons, 1905 |
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Side 53
... bore into the stem decrease the value of the timber greatly . The market becomes glutted with timber after any extensive destruction of woods by insects , and only reduced prices are obtainable , while perhaps no purchaser can then be ...
... bore into the stem decrease the value of the timber greatly . The market becomes glutted with timber after any extensive destruction of woods by insects , and only reduced prices are obtainable , while perhaps no purchaser can then be ...
Side 60
... bore into the bark to hunt for prey . The beetle always seizes its prey behind the head . It is also the most useful of insects in keeping down bark - beetles ( Scolytida ) . Rhizophagus depressus is only about of an inch long , bright ...
... bore into the bark to hunt for prey . The beetle always seizes its prey behind the head . It is also the most useful of insects in keeping down bark - beetles ( Scolytida ) . Rhizophagus depressus is only about of an inch long , bright ...
Side 65
... Bore - holes in trees , bore - dust on cobwebs and on the ground below , or drops of resin on the bark or at the foot of poles or trees , all show that insects are at work in the trees and poles ; and gnawed leaves or excrement seen on ...
... Bore - holes in trees , bore - dust on cobwebs and on the ground below , or drops of resin on the bark or at the foot of poles or trees , all show that insects are at work in the trees and poles ; and gnawed leaves or excrement seen on ...
Side 72
... bore for years before trees show signs of decay . Broad - leaved trees have ( owing to their larger nutrient reserves ) a far greater recuperative power than conifers in recovering from injuries ; and many of the bark - beetles ...
... bore for years before trees show signs of decay . Broad - leaved trees have ( owing to their larger nutrient reserves ) a far greater recuperative power than conifers in recovering from injuries ; and many of the bark - beetles ...
Side 73
... bore - dust can be seen at the entrance - hole ; while both the entrance - holes and the air - holes opened here and there along the main - gallery are easily seen unless the bark is very rough and scaly . The presence of beetles in ...
... bore - dust can be seen at the entrance - hole ; while both the entrance - holes and the air - holes opened here and there along the main - gallery are easily seen unless the bark is very rough and scaly . The presence of beetles in ...
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The Forester: A Practical Treatise on British Forestry and ..., Volum 2 John Nisbet Uten tilgangsbegrensning - 1925 |
Vanlige uttrykk og setninger
acre age-classes annual falls annual rings antennæ attacks autumn Average Yield Tables bark basal area Beech beetles Birch branches Britain broad-leaved trees calculated cambium caterpillars cent Cockchafer compartments conidia conifer crops conifers coppice copse cubic contents damage destructive diameter disease Douglas Fir eggs estimated favourable feed felled felling-series foliage forestry forests frost fungi fungus girth ground growing grubs height hibernate highwoods inch long injurious insects kind of tree land Larch large numbers larva larvæ Life-history mature measured method moths mycelium natural regeneration needles normal growing-stock nurseries percentage plants poles Poplar produced protection pupa pupate rate of growth roots rotation saprophytic sapwood scheme of management Scots Pine seedlings shoots Silver Fir soil and situation species spores sporophores spring Spruce stem sylvicultural thinnings timber timber-crops twigs usually weeds whole wind windfall wing-cases winter woodlands working-circle working-plan young plantations
Populære avsnitt
Side 392 - means any land used as arable meadow or pasture ground only, land used for a plantation or a wood or for...
Side 392 - If the land is used only for a plantation or a wood, the value shall be estimated as if the land, instead of being a plantation or a wood, were let and occupied in its natural and unimproved state.
Side 392 - ... such lands and heritages might in their natural state be reasonably expected to let from year to year as pasture or grazing lands...