Fig. 9

The effect of heat stress (HS) on grapevines uninfected or infected with L. theobromae. Stereomicroscope images were taken at 15 days post-infection, corresponding to 10 days of HS treatment (day-night cycles, with temperatures ranging from 42 to 20 °C). Uninfected and unstressed grapevine show healthy green tissue (a). Uninfected and heat-stressed grapevine show a change to a white color of the pith and phloem impairment (b). Infected but unstressed grapevine show black, yellow and brown color tissues close to the site of inoculation (c). Infected and stressed grapevine show white pith and brown/yellow color in primary xylem (d)