The Shipley Collection of Scientific Papers, Том 1641833 |
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Страница 44
... history has not been fully worked out . Distribution . - Throughout the State , wherever the host plants grow . Food Plants . The common cottonwood ( Populus trichocarpa ) , Popu- lus fremontii , P. balsamifera var . angustifolia ...
... history has not been fully worked out . Distribution . - Throughout the State , wherever the host plants grow . Food Plants . The common cottonwood ( Populus trichocarpa ) , Popu- lus fremontii , P. balsamifera var . angustifolia ...
Страница 84
... History . The life history of this louse greatly resembles that of the mealy plum louse . The over - wintering eggs are laid upon the fruit trees in the fall . The spring broods breed and feed upon the leaves until the hops begin to ...
... History . The life history of this louse greatly resembles that of the mealy plum louse . The over - wintering eggs are laid upon the fruit trees in the fall . The spring broods breed and feed upon the leaves until the hops begin to ...
Страница 7
... history subsequent to introduction and establishment to be what it actually proved to be , rapid and devastating as will be seen in the following account . It has spread through the eastern portion of Canada and the United States and ...
... history subsequent to introduction and establishment to be what it actually proved to be , rapid and devastating as will be seen in the following account . It has spread through the eastern portion of Canada and the United States and ...
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