Resistance to Didymella applanata in red raspberry and some related species

Abstract

S U M M A R YWhen raspberry canes were inoculated in summer with a mycelial inoculum of Didymella applanata resistant genotypes developed relatively small lesions which produced few fruiting bodies in the following spring. Scores of the frequency of these fruiting bodies provided the best discrimination between genotypes. Very strong resistance was found in R . pileatus, R. occidentalis and R . coreanus and in hybrids of these species with red raspberry. Hybrids with R . crataegfolius were less resistant. Resistance was also found in Malling 1473/35, a derivative of red raspberry cv. Chief, and in red raspberry segregates with gene H which determines cane pubescence. Both the expression of resistance and the ranking of resistance sources for their resistance was similar for D. applanata to that reported for Botrytis cinerea.

Evaluation of Rubus genetic resources on their resistance to cane disease

“…We labeled cultivars harbouring gene H, which determines cane pubescence. Historical reports attributed resistance towards B. cinerea, D. applanata and L. coniothyrium and susceptibility towards Elsinoe veneta and Sphaerotheca macularis to the presence of Gene H (Graham et al 2006;Jennings 1962Jennings , 1982Jennings and Brydon 1989a, b). However, Gene H positive cultivars were not among resistant cultivars in this survey (Table 2).…”

“…Gene H, determining pubescence of raspberry canes is a prominent example for broad-spectrum resistance attributed to a single locus in raspberry. It has been shown to be linked with increased resistance towards Didymella applanata, Leptospaeria coniothyrium and Botrytis cinerea and comes at the cost of enhanced susceptibility towards Elsinoe veneta and Sphaerotheca macularis (Graham et al 2006;Jennings 1962Jennings , 1982Jennings and Brydon 1989a, b). Here, we screened the available genetic resources at two different locations in Saxony (East Germany) based on the severity of cane disease symptoms, without attributing symptoms to individual pathogens aiming at the identification of potential sources for broad-spectrum disease resistance.…”

Further evidence on the effects of gene H, which confers cane hairyness, on resistance to raspberry diseases

“…It has also been possible to test whether the gene affects other resistances. The results for cane resistances to B. cinerea and D. applanata have been described in a different context elsewhere (JEN-NINGS & WILLIAMSON, 1981;JENNINGS, 1982) and new results for cane resistance to cane blight (Leptosphaeria coniothyrium (FUCKEL) SACC.) and fruit resistance to grey mould (B. cinerea) are given here.…”

Functionalized iron oxide/SBA-15 sorbent: investigation of adsorption performance towards glyphosate herbicide

“…Unlike pests and weeds (which, generally, appear over one or two periods), pathogenic fungi may occur several times during the growing season. They also cause serious problems during store and transport of ripe fruit (Jennings 1982;Fox 2006;Faby 2008;O'Neill et al 2012), as they change the taste and the appearance of raspberries, and they may also be a source of mycotoxins (Moss 2008;Mitchell et al 2010). In those cases the protective effect is ensured by deposits of plant protection products Responsible editor: Philippe Garrigues (PPPs) present on the plant surface, mainly on leaves and fruit at a moment of possible infection.…”

“…and Fusarium spp. (Jennings 1982;Fox 2006;Faby 2008). This PPP was applied on June 10, 2013 (PHI: 18 days), June 14 (PHI: 29 days), and July 4, 2014 (PHI: 13 days), at a dose of 0.75 kg of pyrimethanil per 1 ha, in all cases.…”