The Shipley Collection of Scientific Papers, Том 1641833 |
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Страница 8
... usually with two darker spots on each side of the body . The young greatly resemble the adults but have six rather than eight legs . Life History . - The mites usually begin to appear after the first warm weather in the spring , the ...
... usually with two darker spots on each side of the body . The young greatly resemble the adults but have six rather than eight legs . Life History . - The mites usually begin to appear after the first warm weather in the spring , the ...
Страница 28
... usually work upon dead or decaying wood , but then usually only in the presence of moisture . In the southern parts of the State these insects have often become destructive to fruit trees , working upon the roots underground and making ...
... usually work upon dead or decaying wood , but then usually only in the presence of moisture . In the southern parts of the State these insects have often become destructive to fruit trees , working upon the roots underground and making ...
Страница 20
... usually killed by frost . Forest trees and those closely planted are more liable to succumb to the effects of repeated defoliation than more sparsely planted or isolated trees . This is due to the fact that the former are usually ...
... usually killed by frost . Forest trees and those closely planted are more liable to succumb to the effects of repeated defoliation than more sparsely planted or isolated trees . This is due to the fact that the former are usually ...
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