Figures & data
Table 1. Applications and treatments applied to soil by drip irrigation during the 2020–22, and 2021–23 growing seasons in San Luis Obispo, CA.
Figure 1. The odds ratio of Verticillium dahliae survival in terminated crop for trial 1. With all other predictors held constant, the odds ratio represents the likelihood of pathogen survival after a particular exposure (crop termination). Negative binomial generalized linear model regression (α = 0.05). n = 3.
Table 2. Trials 1 and 2 post crop termination pathogen survival in host tissue 7 and 14 days after fumigation (DAF). % positive indicates samples showing Verticillium dahliae microsclerotia on a semi-selective medium, NP-10. ± represent standard error of the mean. n = 3.
Figure 2. The odds ratio of Verticillium dahliae survival in terminated crop for trial 2. With all other predictors held constant, the odds ratio represents the likelihood of pathogen survival after a particular exposure (crop termination). Negative binomial generalized linear model regression (α = 0.05). n = 3.
Figure 3. Soil inoculum density of Verticillium dahliae for the non-treated control beds at different timepoints during the fumigation series. PCT denotes after the crop termination treatment. PBF denotes after the bed fumigation treatment. Error bars represent standard error of the mean. n = 3.
Figure 4. Soil inoculum density of Verticillium dahliae for all treatments, separated by fumigant type, at the conclusion of the fumigation series in trial 1. Negative binomial generalized linear model regression (α = 0.05). CT denotes plots only crop terminated. BF denotes plots only bed fumigated. CT+BF denotes plots sequentially treated with both methods. Error bars represent standard error of the mean. n = 3.
Figure 5. Soil inoculum density of Verticillium dahliae for all treatments, separated by fumigant type, at the conclusion of the fumigation series in trial 2. Negative binomial generalized linear model regression (α = 0.05). CT denotes plots only crop terminated. BF denotes plots only bed fumigated. CT+BF denotes plots sequentially treated with both methods. Error bars represent standard error of the mean n = 3.
Table 3. Estimated mean pathogen densities for trials 1 and 2. Lines I/IV denote the outer lines and lines II/III denote the inner lines of drip irrigation tape. CT = crop termination only; BF = bed fumigation only; CT + BF + crop termination and bed fumigation. Mp = metam potassium; Ms = metam sodium; Pic = chloropicrin. ± represent standard error of the mean. P-value resulting from a Tukey multiple comparison test with α = 0.05.
Supplemental Material
Download Zip (188.3 KB)Data availability statement
The data that support the findings of this study are available from the corresponding author, JTK, upon reasonable request.