. Causes, effects and control of defoliation on tomatoes. Tomatoes; Tomatoes; Defoliation. Defoliation on Tomatoes 215 Data were plotted (Figure 8) on log-probability paper using dosaige as pounds of copper per acre. Alternaria attacked early and heavily and spraying began somewhat late. On this account no treatment gave very good control. In the first analysis of the data the effect of the three gallonages was determined on the basis of dosage for equal control (13). The level of control that fits all three the best is 25 percent. This level of control was provided by 80 g60 o cc u _r o q: 20
. Causes, effects and control of defoliation on tomatoes. Tomatoes; Tomatoes; Defoliation. Defoliation on Tomatoes 215 Data were plotted (Figure 8) on log-probability paper using dosaige as pounds of copper per acre. Alternaria attacked early and heavily and spraying began somewhat late. On this account no treatment gave very good control. In the first analysis of the data the effect of the three gallonages was determined on the basis of dosage for equal control (13). The level of control that fits all three the best is 25 percent. This level of control was provided by 80 g60 o cc u _r o q: 20 TT 1âI I M MM. / / / ./ 5/64 nozzle o o /⢠4/64" nozzle @ @ 3/64"nozzle ⢠⢠I Mini I III .6 3 6 10 Figure 8. Eflfect of coverage with yellow copper oxide spray by using various sizes of nozzles on control of defoliation of tomatoes by Alternaria solani. 1 1 \ llll 1 1 i 1 1 llll 80 - 60 ^^ ® < 1â' 13 ^M 40 / / Stents / y y / 20 - ^ ^ / ® ^ b â J? (-''â ''^ /â c r^ ^ 10 sees® â¢Â® / Leaves <\ \ III! llll Mill I 2 5 10 DOSAGE, LBS. Figure 9. Relation of spraying time (seconds per plant) to cover- age by yellow copper oxide spray on the control of de- foliation of tomatoes caused by Alternaria solani. pounds of copper per acre per application when applied in 375 gallons of water through the large aperture. The requisite dosage in- creased by ten fold to pounds when it was applied in 150 gallons of water with the medium disc. The requisite dosage increased fur- ther to pounds when it was applied in only 60 gallons of water with the smallest disc. An unexpected result appeared in the data. The slope of the dosage response curve became flatter as the coverage improved (Fig- ures 8 and 9). Dimond (3) has shown that this slope is a linear func- tion of coverage and he suggested that the slope of the curve offers a convenient measure of coverage. This experiment in 1940 was interesting and pr
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