Effects of fungicide on growth of Leptosphaeria maculans and L. biglobosa in relation to development of phoma stem canker on oilseed rape (Brassica napus)

摘要: Controlled-environment and field experiments were done to investigate effects of the fungicide Punch C (flusilazole plus carbendazim) on growth Leptosphaeria maculans L. biglobosa in oilseed rape. In controlled-environment experiments, for plants inoculated with maculans, treatment decreased lesion size amount DNA leaves; biglobosa, did not affect or pathogen DNA. When release ascospores was monitored using a Burkard spore sampler, timing pattern ascospore differed between four seasons. 2006/2007, majority released whilst 2007/2008 biglobosa; both seasons before ascospores. 2002/2003 2003/2004, severity stem canker cv. Apex, but gave no significant yield response. 2006/2007 2007/2008, phoma leaf spot incidence autumn at harvest, increased yield. Fungicide more Courage, good response, than Canberra. frequency spread into pith tissues (measured by quantitative PCR). These results are used suggest how fungicides interactions might