The Shipley Collection of Scientific Papers, Том 1641833 |
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... Larch Sawfly , " prepared by Dr. C. Gordon Hewitt , Dominion Entomologist . The Large Larch Sawfly has , in the past thirty or forty years worked inestimable injury to our tamarack or larch forests in Canada . The immense areas involved ...
... Larch Sawfly , " prepared by Dr. C. Gordon Hewitt , Dominion Entomologist . The Large Larch Sawfly has , in the past thirty or forty years worked inestimable injury to our tamarack or larch forests in Canada . The immense areas involved ...
Страница 11
... larch in different parts of Eastern Massachusetts , and threaten to become a serious drawback to the cultivation of ... sawfly in Quebec in 1885 , states : " I had noticed these larvæ on the larch trees in former years , but they ...
... larch in different parts of Eastern Massachusetts , and threaten to become a serious drawback to the cultivation of ... sawfly in Quebec in 1885 , states : " I had noticed these larvæ on the larch trees in former years , but they ...
Страница 21
... larch , L. leptolepis End ! . , which some foresters have believed to be immune , and also upon the Siberian larch L. sibirica Ledeb . The last species has been found attacked by the sawfly in Finland . NATURAL ENEMIES . When an insect ...
... larch , L. leptolepis End ! . , which some foresters have believed to be immune , and also upon the Siberian larch L. sibirica Ledeb . The last species has been found attacked by the sawfly in Finland . NATURAL ENEMIES . When an insect ...
Чести термини и фразе
abdomen abdominal segment adult antennæ ants aphid Aphis Appearance apple arsenic attacked body breeding brood buds California caterpillars cells cent citrus cocoons colonies color Commissioner cornicles cyanide damage deposited destructive Distribution dorsal early eggs Entomologist erichsonii Essig Family feed femora flies foliage Food Plants fruit fumigation gallons genus green hatch head hibernate History horticultural host inch long infested instabilis ladybird beetle larch Larch Sawfly large numbers larva larvæ lateral leaves legs Linn louse maggots male mealy bug mermithergates mites mosquitoes moth muscles Natural Enemies nest numbers observations Orasema orchards ovipositor P. C. Jr parasites Paris green pest Pheidole plant lice Plate Polyederkrankheit pound pseudogynes pupa pupæ pupal pupate quarantine Raupen sawfly scale insects southern species specimens spiracles spray spring stage summer surface thorax thrips Throughout the entire trees usually ventral winged female winter workers yellow young