Zobrazeno 1 - 10
of 28
pro vyhledávání: '"S. H. Crowdy"'
Autor:
A. F. Posnette, S. H. Crowdy
Publikováno v:
The Annals of applied biology. 3(3)
Experiments on cross-immunity reactions between three viruses attacking Theobroma cacao L. on the Gold Coast are described. A field trial involving 3 acres of graft-inoculated trees revealed some degree of protection afforded by Theobroma virus 1B ag
Autor:
S. H. Crowdy
Publikováno v:
Annals of Applied Biology. 34:45-59
Calonectria rigidiuscula has been found associated with an acute and a chronic form of dieback of cacao. It can also infect cankers caused primarily by Phytophthora palmivora, and the lesions following attack by the capsids Sahlbergella singidaris an
Autor:
R. L. Wain, S. H. Crowdy
Publikováno v:
Annals of Applied Biology. 38:318-333
A method is described for assessing the systemic activity of compounds in checking the infection of broad bean (Vicia faba) by the fungi Botrytis cinerea or B. fabae. Treatment consisted in allowing the roots of young seedlings to stand in a solution
Autor:
S. H. Crowdy
Publikováno v:
Annals of Applied Biology. 39:569-580
Autor:
S. H. Crowdy
Publikováno v:
Annals of Applied Biology. 36:483-495
The development of cankers caused by Nectria galligena on apple is described; the pathogen exploits all the tissues outside the xylem and will also penetrate the xylem to an appreciable depth, invading the xylem parenchyma, vessels and fibres. Spread
Publikováno v:
Annals of Applied Biology. 39:581-587
Field observations on leaf-scar canker of apple confirm its importance in the southwest of England: on a heavily infected tree more than 5% of the current year's growth may be damaged. Leaf scars may become infected by spores of Nectria galligena whi
Autor:
S. H. Crowdy, Trevor W. Tanton
Publikováno v:
Journal of Experimental Botany. 21:102-111
A technique has been developed for the study of pathways of water movement in the xylem and free space of wheat leaves. Plants were treated with Lead-EDTA chelate through either the roots or the leaves; after treatment the lead was precipitated in si
Publikováno v:
Journal of Experimental Botany. 9:206-219
Autor:
S. H. Crowdy
Publikováno v:
Annals of Applied Biology. 40:197-207
Wounds were made at various times of the year on the trunks and large branches of apple trees with a 1 in. bit and treated with a number of organic compounds in lanoline paste. The healing of these wounds was followed through two growing seasons by t
Autor:
S. H. Crowdy, Trevor W. Tanton
Publikováno v:
Journal of Experimental Botany. 23:619-625
Water in the transpiration stream is distributed throughout the leaves in the vascular bundles. In wheat, water appears to be confined to the main veins by the mestome sheath and to enter the mesophyll through the walls of the smaller veins. Within t