Response of Strawberry Cultivars Inoculated with Macrophomina phaseolina in Australia

Figures & data

Table 1. Regression coefficients, standard errors and 95% confidence intervals (CI) together with predicted proportion dead (%) on the backtransformed original scale for each cultivar at week 23 after inoculating with M. phaseolina isolate BRIP 66625 from the logistic regression model using Firth’s method

Cultivar	Coefficients	Standard errors	Confidence intervals		Predicted proportion dead (%)
			Lower 0.95	Upper 0.95
Albion	2.833	1.543	0.752	7.695	94	a
Camarosa	0.956	0.789	−0.407	2.649	72	ab
Strawberry Festival	0.368	0.643	−0.826	1.652	59	abc
Rubygem	0.201	0.670	−1.059	1.514	55	abcd
Florida Radiance	−0.368	0.643	−1.652	0.826	41	abcd
Red Rhapsody	−1.099	1.033	−3.398	0.587	25	bcd
Suncoast Delight	−1.609	0.949	−3.859	−0.091	17	bcd
Sweet Charlie	−1.609	0.949	−3.859	−0.091	17	bcd
Kabarla	−2.708	1.561	−7.574	−0.604	6	cd
Earlibrite	−2.833	1.543	−7.695	−0.752	5	cd
Phenomenal	−2.944	1.529	−7.804	−0.882	5	d

Coefficients are prediction (proportion dead at week 23), with standard errors for the estimate. The CI (lower and upper 0.95) gives the 95% confidence interval for the predictions. If the 95% CI for one prediction does not overlap the 95% CI of another prediction, then cultivars are significantly different (i.e. cultivars with same subscript are not significantly different). The predicted proportion dead is the predicted proportion at week 23, e.g. it is predicted that by week 23, 94% of ‘Albion’ plants will be dead.

Figure 1. Hazard ratios for cultivars tested compared to the reference cultivar ‘Camarosa’ when challenged with M. phaseolina isolate BRIP 66625. A hazard ratio of 1 or more implies equal or greater susceptibility than the control ‘Camarosa’. Hazard ratios less than 1 imply greater resistance than ‘Camarosa’. Columns with the same subscript are not significantly different in response to the pathogen (P ≥ 0.05)

Figure 2. Predicted survival plots for the 11 cultivars tested showing the predicted proportion of plants alive at each time after inoculation with M. phaseolina isolate BRIP 66625. Predicted survival proportion range from 0 to 1, where 0 = no plants survived and 1 = all plants survived