Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 124 Diseases of Economic Plants Ventilation and removal of shading trees are beneficial. Close planting should be avoided in order to allow quick drying, trellises should run in such direction as to allow free access of sun. But these means are only palliative. To control the mildew in dry climates employ flowers of sulfur. The sulfur, when the temperature is above 24° C. (75° F.), passes into the air, and its fumes, coming in contact Fig. 63. —• Black-rot spots enlarged to show the pycnidia.
Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 124 Diseases of Economic Plants Ventilation and removal of shading trees are beneficial. Close planting should be avoided in order to allow quick drying, trellises should run in such direction as to allow free access of sun. But these means are only palliative. To control the mildew in dry climates employ flowers of sulfur. The sulfur, when the temperature is above 24° C. (75° F.), passes into the air, and its fumes, coming in contact Fig. 63. —• Black-rot spots enlarged to show the pycnidia. After Anderson. with the fungus, kill it. Below the temperature at which sulfur is effective the fungus will make but little progress. When the air, shade temperature, is from 32° to 35° C. (90° to 95° F.), the kilUng effect of the sulfur may be seen within 24 hours; if above 38° C. (100° F.), one or two days are suf- ficient to rid the vineyard of the disease. The sulfur must be distributed to every part of the vine. Sulfur upon the ground is of no use. The vines should be dusted from one to seven times, according to conditions, susceptibility, climate, etc. The first sulfuring should be done when the blossoms
Size: 1671px × 1197px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
