Apple Powdery Mildew and Its Control in the Arid Regions of the Pacific NorthwestU.S. Department of Agriculture, 1918 - 28 páginas Of control measures -- Dormant sprays. pp. 23. |
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Página 1
... Orchard spraying experiments - Contd . Review of the literature ... 2 The causal organism ..... 4 Spraying experiments in 1916 . Spraying experiments in 1917 . 15 17 Dissemination of the fungus .. 5 Injury to fruit and foliage ... 20 ...
... Orchard spraying experiments - Contd . Review of the literature ... 2 The causal organism ..... 4 Spraying experiments in 1916 . Spraying experiments in 1917 . 15 17 Dissemination of the fungus .. 5 Injury to fruit and foliage ... 20 ...
Página 2
... orchards ; and , having a high valuation , it is cut up into small holdings , the average orchard area being somewhat less than 10 acres for each owner . Great attention is given to every detail of the orchard operations ; pests and ...
... orchards ; and , having a high valuation , it is cut up into small holdings , the average orchard area being somewhat less than 10 acres for each owner . Great attention is given to every detail of the orchard operations ; pests and ...
Página 5
... orchards which are being irrigated . The daily range of temperature varies between 25 and 30 degrees F. during most of the early part of the season , and often it is even greater ; consequently , dews are frequent and occur in the orchards ...
... orchards which are being irrigated . The daily range of temperature varies between 25 and 30 degrees F. during most of the early part of the season , and often it is even greater ; consequently , dews are frequent and occur in the orchards ...
Página 6
... orchards . The results were always negative . It would appear from these studies that the ascospores play little , if any , part in spreading the disease and that they are unnecessary to the overwintering of the fungus . This con ...
... orchards . The results were always negative . It would appear from these studies that the ascospores play little , if any , part in spreading the disease and that they are unnecessary to the overwintering of the fungus . This con ...
Página 8
... orchards showed a reduction in crop of 25 to 50 per cent . Jonathan and Newtown are the most susceptible varieties . That the disease is equally serious in the Yakima Valley , Wash . , where the largest acreage of apple orchards in the ...
... orchards showed a reduction in crop of 25 to 50 per cent . Jonathan and Newtown are the most susceptible varieties . That the disease is equally serious in the Yakima Valley , Wash . , where the largest acreage of apple orchards in the ...
Palavras e frases frequentes
50 gallons ammoniacal copper carbonate appearance APPLE POWDERY MILDEW apple scab application of sulphur ascospores Ballard and Volck Baumé Ben Davis apple Black Ben Davis blossom Bordeaux mixture burning sunlight cent colloidal sulphur color conidia control established crease crop of fruit diluted disease dormant spray effect felted mycelium foliage infection Formula free sulphur fruit burning fruit injury fungicidal fungus gallons of spray gallons of water ground sulphur material growing season growth hot weather iron sulphate Jonathan trees July 15 June 11 lead arsenate leaf lime-sulphur solution Maxi mildew control mildew infection orchards overwintering Pajaro Valley perithecia plat Podosphaera leucotricha polysulphid pounds to 50 pruning Pryor Red trees Pryor Red variety Slight sodium-sulphur spores spray material sprayed with lime-sulphur sprays applied Stayman sulphids sulphur injury sulphur spotting sulphur sprays susceptible temperatures terminal tion U. S. Dept Volck 12 Wash Wenatchee Valley Winesap