The Shipley Collection of Scientific Papers, Том 1641833 |
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Страница 44
... orchards ; wherever there are infestations of plant lice . In the orchards of California they are very abundant and play an important part in the control of many bad pests , but more important in keeping down the aphids . When there is ...
... orchards ; wherever there are infestations of plant lice . In the orchards of California they are very abundant and play an important part in the control of many bad pests , but more important in keeping down the aphids . When there is ...
Страница 311
... orchards are clubbing together and buying a power sprayer for several orchards and find this a convenient way of getting first class work done cheaply . For truck crops an entirely different machine has been devised . Some growers have ...
... orchards are clubbing together and buying a power sprayer for several orchards and find this a convenient way of getting first class work done cheaply . For truck crops an entirely different machine has been devised . Some growers have ...
Страница 334
... orchards is very rapid and under ordinary methods of fumigation , where only part of a district is treated each year , there is always a source of re - infestation from the trees which have not been fumigated for from one to several ...
... orchards is very rapid and under ordinary methods of fumigation , where only part of a district is treated each year , there is always a source of re - infestation from the trees which have not been fumigated for from one to several ...
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