Histopathological study of the effect of post leaf fall application of urea on saprotrophic development of the cherry leaf spot pathogen, Blumeriella jaapii

Perpetuation of Cherry Leaf Spot Disease in Ornamental Cherry

“…These observations confirmed previous report by Bengtsson et al. (), in which apothecia and acervuli produced ascospores and conidiospores on leaf debris for early spring infection. Thus, despite the warmer climate in Tennessee, our results were similar to those from fruiting cherry in cooler regions (Bengtsson et al.…”

“…Thus, despite the warmer climate in Tennessee, our results were similar to those from fruiting cherry in cooler regions (Bengtsson et al. ) in that B. jaapii was perpetuated on leaf debris and both ascospores and conidiospores constituted the source of primary inoculum.…”

Some aspects of disease management of cherry leaf spot (Blumeriella jaapii) with special reference to pesticide use

“…This method has also been investigated for the control of apple scab (e. g. MacHardy, 1996;Holb et al, 2006). Bengtsson et al (2006) demonstrated that the use of urea as a post leaf fall application in integrated disease management would seem to be a very promising method for reducing the primary inoculum of the cherry leaf spot pathogen; however, the results of the study show the importance of careful timing of urea application. Thus application must be made when the fungus is in its active saprotrophic growth phase, and there is thus a window for successful control by this method of approximately four weeks after leaf fall.…”

“…urea) are recommended to reduce overwintering inoculum sources of cherry leaf spot (Table 1) (e. g. Holb, 2002;Jenser & Véghelyi, 2003;Holb & Veisz, 2005). Pedersen & Hockenhull (1996), Bengtsson et al (2006) and Green et al (2006) demonstrated that the use of urea applied at leaf fall can be an alternative approach to reduce the amount of primary inoculum produced by the pathogen in the spring. This method has also been investigated for the control of apple scab (e. g. MacHardy, 1996;Holb et al, 2006).…”