The Shipley Collection of Scientific Papers, Том 1641833 |
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Страница 44
... trees . The following precautions should be taken in setting out any new apple or peach orchard : 1. Set out clean stock . Do not buy trees which have the roots puddled unless the mud is washed off - it may hide the woolly aphis or ...
... trees . The following precautions should be taken in setting out any new apple or peach orchard : 1. Set out clean stock . Do not buy trees which have the roots puddled unless the mud is washed off - it may hide the woolly aphis or ...
Страница 19
... trees constituting the second growth at that time on the growth of the trees is very plainly shown by the crooked character of the trunks of young ... tree 23544-2 When the trees have been completely defoliated for three successive 19.
... trees constituting the second growth at that time on the growth of the trees is very plainly shown by the crooked character of the trunks of young ... tree 23544-2 When the trees have been completely defoliated for three successive 19.
Страница 20
... tree but these leaves are 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 ...
... tree but these leaves are 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 ...
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