![]() The relationship between blight-free tuber yield and start of the first attack indicated a yield increase of 287 kg/day ( R 2 = 0.27) for every day’s delay in first attack. The relationship between foliage late blight and tuber blight was weak with the best match found at high disease severity late in the growing season ( r = 0.33 p < 0.001). In 1994, 20–2011, the attacks increased from first symptoms to 65% disease severity in the untreated control within 16–21 days, compared with 35–40 days in 1995, 19. For example, in 2002–20, the first attack occurred 40–55 days after planting (DAP), compared with 95–108 DAP in 19. Differences between years and regions were great in terms of date of the first attack and how the attack developed during the season. The estimated first attack of late blight was earlier in many field trials after 1998. 75% disease severity in the untreated control, in the majority of the field trials. ![]() Late blight reached epidemic proportions, i.e. ![]() A dataset with results from these field trials was used (i) to examine possible changes in the appearance and behaviour of late blight attack over the years, (ii) to investigate the relationship between late blight in foliage and tuber blight, (iii) to investigate the relationship between late blight and tuber yield and (iv) to identify any correlations between different variables in the dataset. During 1983–2012, three field trials per year were performed in each of the three southernmost counties in Sweden to test different fungicide programmes aiming to control late blight, primarily in the very susceptible potato cultivar Bintje.
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