. Annals of applied biology. Biology, Economic; Biochemistry. 202 A Capper Emalsion as a Fmigicide Delailed observations of Experiment II. Inoculated August 16 August 20 August 23 August 28 Sept. 11 (terminal leaflet . -left sprayed \^^^^^^ Leaf a. no diseased spots no diseased spots ) i i r do. do. ' do. do. IhVholeleaf uninjured do. do. do. do. Leaf b unsprayed T r r terminal Leafc Ijpf^ sprayed (^j^j^^ 1 distinct spot of 1 spot 1 cm., another blight I 0-3 cm. diam. 2 distinct spots of The two spots have blight \ coalesced 4 distinct spots of Whole leaflet blackened blight and withered
. Annals of applied biology. Biology, Economic; Biochemistry. 202 A Capper Emalsion as a Fmigicide Delailed observations of Experiment II. Inoculated August 16 August 20 August 23 August 28 Sept. 11 (terminal leaflet . -left sprayed \^^^^^^ Leaf a. no diseased spots no diseased spots ) i i r do. do. ' do. do. IhVholeleaf uninjured do. do. do. do. Leaf b unsprayed T r r terminal Leafc Ijpf^ sprayed (^j^j^^ 1 distinct spot of 1 spot 1 cm., another blight I 0-3 cm. diam. 2 distinct spots of The two spots have blight \ coalesced 4 distinct spots of Whole leaflet blackened blight and withered All three leaflets ' Whole leaf destroyed destroyed no diseased spots do. do. do. do. no diseased spots do. do. do. do. no spots do. do. no spots do. do. On the same date as the last experiment, a plant with many badly diseased leaves was sprayed with the emulsion but the disease extended in all the affected leaflets. From these experiments, it is evident that the emulsion acted as a preventive against infection by zoospores of PhytophtJiora infestans and justified trials on a larger scale. Later in the year, two small plots of potatoes, each measuring approximately 120 scj. yds, were sprayed with the emulsion and on this occasion when tap water was used instead of distilled water hitherto employed in these experiments, a little difficulty was experienced in spraying the fluid owing to the accumulation in the nozzles of the sprayer of the green sticky substance referred to already. At the time the crop was lifted the leaves of the sprayed plots were certainly much greener and showed far less damage by blight than those of the unsprayed control plot, but owing to the lateness of the appear- ance of the blight, all three plots had approximately the same low percentage of diseased tubers although the two sprayed plots showed a slightly greater total yield than the control plot. In 1918, these trials were repeated and two more small plots, each approximately 36 sq. yds in area, we
Size: 1882px × 1328px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1919
