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Browsing by Author "Huang, Yongju"
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Effects of fungicides on control of Leptosphaeria maculans and L. biglobosa (Phoma stem canker) in oilseed rape
Hood, J. R.; Huang, Yongju; Evans, Neal; Rossall, S.; Ashworth, M.; Fitt, Bruce D.L. (2008-08) -
Effects of host resistance on maturation of pseudothecia of Leptosphaeria maculans and L. biglobosa (cause of Phoma stem canker) in Brassica napus (oilseed rape)
Sidique, Siti Nordahliawate; Huang, Yongju; Hall, Avice; Fitt, Bruce D.L. (2013-08)The stem canker epidemics are initiated in autumn by air-borne ascospores produced in pseudothecia on infected crop debris from previous crops. This study aimed to investigate the effects of cultivar resistance and ... -
Effects of Leptosphaeria maculans race structure and fitness cost of virulence on management of phoma stem canker of oilseed rape
Huang, Yongju; Balesdent, Marie-Helene; Van de Wouw, A. P.; Stonard, Jenna F.; Evans, Neal; West, Jon S.; Rouxel, Thierry; Fitt, Bruce D.L. (2011)Fitness of virulent (avrLm1 and avrLm4) or avirulent (AvrLm1 and AvrLm4) isolates of Leptosphaeria maculans on Brassica napus without the corresponding resistance genes Rlm1 and Rlm4 was investigated in controlled environment ... -
Effects of plant age and inoculum concentration on light leaf spot disease phenotypes on oilseed rape
Sapelli, Laura; Karandeni Dewage, Chinthani Shanika; Ritchie, Faye; Fitt, Bruce; Huang, Yongju (2021-06-16)Light leaf spot is caused by the fungal pathogen Pyrenopeziza brassicae and is the mosteconomically damaging disease of oilseed rape (Brassica napus) in the UK. Current controlrelies on repeated fungicide applications; ... -
Effects of temperature on germination and hyphal growth from ascospores of A-group and B-group Leptosphaeria maculans (phoma stem canker of oilseed rape)
Huang, Yongju; Toscano-Underwood, C.; Fitt, Bruce D.L.; Todd, A. D.; West, Jon S.; Koopmann, B.; Balesdent, Marie-Helene (2001)Ascospores of both A-group and B-group Leptosphaeria maculans germinated at temperatures from 5-20degreesC on distilled water agar or detached oilseed rape leaves. After 2 h of incubation on water agar, some A-group ... -
Effects of temperature on maturation of pseudothecia of Leptosphaeria maculans and L-biglobosa on oilseed rape stem debris
Toscano-Underwood, C.; Huang, Yongju; Fitt, Bruce D.L.; Hall, A. M. (2003-12)Effects of temperature on maturation of pseudothecia of Leptosphaeria maculans and L. biglobosa, closely related species which coexist on UK oilseed rape, were investigated. Stages in pseudothecial maturation on naturally ... -
Effects of temperature on R1m6-mediated resistance to Leptosphaeria maculans in Brassica napus
Huang, Yongju; Liu, R.; Li, Zi-Qin; Evans, Neal; Chevre, Anne-Marie; Delourme, R.; Renard, Michel; Fitt, Bruce D.L. (IOBC, 2006)Near-isogenic lines of Brassica napus lines with/without the resistance gene Rlm6 were used to investigate the effects of temperature on Rlm6-mediated resistance to Leptosphaeria maculans. Leaves were inoculated with ... -
Effects of timing of Leptosphaeria maculans ascospore release and fungicide regime on phoma leaf spot and phoma stem canker development on winter oilseed rape (Brassica napus) in southern England
West, Jon S.; Fitt, Bruce D.L.; Leech, P. K.; Biddulph, J. E.; Huang, Yongju; Balesdent, M. H. (2002-08)At Rothamsted during 1997/98, 1998/99 and 1999/2000 winter oilseed rape growing seasons, numbers of air-borne ascospores of Leptosphaeria maculans were often > 4 m(-3) from autumn (September/October) to spring (April/May), ... -
Efficient qPCR estimation and discrimination of airborne inoculum of Leptosphaeria maculans and L. biglobosa, the causal organisms of phoma leaf spotting and stem canker of oilseed rape : qPCR detection of Leptosphaeria airborne inoculum
Kaczmarek, Joanna; S. West, Jon; King, Kevin M.; Canning, Gail; Latunde-Dada, Akinwunmi O.; Huang, Yongju; Fitt, Bruce; Malgorzata Jedryczka, Malgorzata (2023-12-06)BACKGROUND: Detection of the inoculum of phytopathogens greatly assists in the management of diseases, but is difficult for pathogens with airborne fungal propagules. Here, we present experiments to determine the abundance ... -
Epidemiology and global distribution of A-group and B-group Leptosphaeria maculans on oilseed rape
Huang, Yongju; Fitt, Bruce D.L.; Hu, X. J.; Hall, Avice (2003) -
Evaluation of oilseed rape seed yield losses caused by Leptosphaeria biglobosa in central China
Cai, Xiang; Huang, Yongju; Jiang, Daohong; Fitt, Bruce D.L.; Li, Guoqing; Yang, Long (2017-06-09)Phoma stem canker of oilseed rape (Brassica napus), caused by Leptosphaeria maculans/L. biglobosa is a globally important disease. Severe phoma stem canker symptoms have been observed on winter oilseed rape in China but ... -
Factors affecting canker and light leaf spot severity in oilseed rape
West, Jon S.; Gladders, P.; Booth, E.; Thomas, J.; Jennaway, R.; Werner, P.; Bowman, J.; Nightingale, M.; Padbury, N.; Clarke, M.; Rogers, S. L.; Kenyon, D.; Atkins, Simon D.; Boys, Emily F.; Huang, Yongju; Evans, Neal; Latunde-Dada, A. O.; Li, Q.; Fitt, Bruce D.L. (2008-06) -
Factors affecting co-existence of related pathogen species on arable crops
West, Jon S.; Huang, Yongju; van den Bosch, Frank; Fitt, Bruce D.L. (2005) -
Factors contributing to the holistic control of strawberry powdery mildew
Jin, Xiaolei; Hall, Avice; Fitt, Bruce D.L.; Huang, Yongju (Association of Applied Biologists, 2014-11) -
Fitness cost associated with loss of the AvrLm4 avirulence function in Leptosphaeria maculans (Phoma stem canker of oilseed rape)
Huang, Yongju; Li, Z. Q.; Evans, Neal; Rouxel, T.; Fitt, Bruce D.L.; Balesdent, Marie-Helene (2006-01)Near-isogenic isolates of Leptosphaeria maculans differing at the AvrLm4 avirulence locus (AvrLm4 or avrLm4) were produced in vitro. Methods for inoculation of leaves of oilseed rape with ascospores or conidia were compared. ... -
Genetics studies on resistance (tolerance) to Sclerotinia sclerotiorum in rapeseed (B. napus L.)
Huang, Yongju; Chen, Jun; Li, Yunchang (2000) -
Geographic variation in Leptosphaeria maculans (phoma stem canker of oilseed rape) populations in the UK
Huang, Yongju; Mitrousia, Georgia; Fitt, Bruce D.L. (2013-08)Major resistance (R) gene-mediated resistance against Leptosphaeria maculans is associated with a gene-forgene interaction in which the product of a pathogen effector (Avr) gene is recognised by the product of a host R ... -
Geographic variation in severity of phoma stem canker and Leptosphaeria maculans/L. biglobosa populations on UK winter oilseed rape (Brassica napus)
Stonard, J. F.; Latunde-Dada, A. O.; Huang, Yongju; West, Jon S.; Evans, N.; Fitt, Bruce D.L. (2010-01)Phoma stem canker, caused by Leptosphaeria maculans and L. biglobosa, is the most important disease of oilseed rape in Europe. Differences between L. maculans and L. biglobosa in their life-cycles enable the two species ... -
How interactions between phoma stem canker pathogens are influenced by fungicides
Moloney, Steven J; Huang, Yongju; Hall, Avice; Ashworth, M.; Gladders, Peter; Fitt, Bruce D.L. (2012) -
Identification of environmentally stable QTL for resistance against Leptosphaeria maculans in oilseed rape (Brassica napus)
Huang, Yongju; Jestin, C.; Welham, S.J.; King, Graham; Manzanares-Dauleux, Maria; Fitt, Bruce D.L.; Delourme, Regine (2016-01-31)Phoma stem canker, caused by Leptosphaeria maculans, is a disease of world-wide importance on oilseed rape (Brassica napus). Quantitative trait locus (QTL) mediated resistance against L. maculans in B. napus is considered ...