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Here we see that a linear relationship existed in this same 1999 experiment between the time of first symptom appearance and the number of extra-large fruit or the total fruit weight. The Y axis gives yield in % compared to the untreated control. The equations describe this relationship, and would provide a means of predicting yield loss from symptom appearance. At the same time there was no statistically significant relationship between the average fruit weight and symptom appearance, indicating that fruit number not fruit size was the yield parameter most affected by the virus.
Here we see results from a similar experiment run in the spring of 2000. An open pollinated variety, Neptune, was used instead of the hybrid FL-47 used the previous year. Results are similar to the previous year in that the slope of the line is almost the same. However, the intercept is quite different, which means that the effect of early infection on yield was much less in 2000 compared to the uninfected controls than it was in 1999. This could mean that the uninfected controls yielded less in 2000 or that the impact of early infection was not as great as the previous year, due to different conditions such as the variety used. Nevertheless, the same overall principal holds: impact of TYLCV is greatest for early infection. Impact of TYLCV on Tomato Yield: Conclusions
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