The Shipley Collection of Scientific Papers, Том 1641833 |
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Страница 88
... Natural Enemies . This insect would be a far greater pest were it not for its many natural enemies . Two internal parasites , Aphidius testaccipes Cress . and Charips xanthopsis , have been bred from adult lice , while the California ...
... Natural Enemies . This insect would be a far greater pest were it not for its many natural enemies . Two internal parasites , Aphidius testaccipes Cress . and Charips xanthopsis , have been bred from adult lice , while the California ...
Страница 161
Natural Enemies . By far the most important factors in the con- trol of army and cut worms are natural enemies . The parasitic tachinid flies kill countless numbers of the worms . Hymen- opterous parasites of the family Ichneumonidæ ...
Natural Enemies . By far the most important factors in the con- trol of army and cut worms are natural enemies . The parasitic tachinid flies kill countless numbers of the worms . Hymen- opterous parasites of the family Ichneumonidæ ...
Страница 21
... NATURAL ENEMIES . When an insect , such as the larch sawfly occurs over a large area the natural enemies are the only factors which are able to control it . This being the case , the study of these natural enemies and of the means by ...
... NATURAL ENEMIES . When an insect , such as the larch sawfly occurs over a large area the natural enemies are the only factors which are able to control it . This being the case , the study of these natural enemies and of the means by ...
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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