Abstract
A two-year field study was conducted at El-Ismailiya, Egypt, to evaluate the fungicides Bellis and Sulphurs applied as a foliar sprays for controlling powdery mildew on six flax cultivars. Disease severity, straw yield, and seed yield were used as criteria for evaluating the performance of fungicide on the tested cultivars. Analysis of variance (ANOVA) showed that each of the fungicides and cultivar was highly significant source of variation (p = 0.000), in disease severity, strae yield, and seed yieled. ANOVA also showed that fungicide x cultivars interaction was a highly significant source of variation (p = 0.000) in disease severity, while it was insignificant in straw and seed yields. Both fungicides were effective in reducing disease severity; however, sulphur surpassed Bellis in increasing straw yield and seed yield. Therefore, linear regression analysis was used to determine the relationship between agronomic or technological traits and powdery mildew severity (PMS). All traits showed significant negative correlations with PMS after the appliction of fungicides, which suggest that control of late-season powdery mildew could be economically important when PMS on flax cultivars is high.
Highlights
IntroductionFlax (Linum usitatissimum L.) powdery mildew caused by Oidium lini, Skoric, which is identified as a synonym of Podosphaera lini (Preston and Cook 2019; Braun et al, 2019)
All traits showed significant negative correlations with powdery mildew severity (PMS) after the appliction of fungicides, which suggest that control of late-season powdery mildew could be economically important when PMS on flax cultivars is high
Flax (Linum usitatissimum L.) powdery mildew caused by Oidium lini, Skoric, which is identified as a synonym of Podosphaera lini (Preston and Cook 2019; Braun et al, 2019)
Summary
Flax (Linum usitatissimum L.) powdery mildew caused by Oidium lini, Skoric, which is identified as a synonym of Podosphaera lini (Preston and Cook 2019; Braun et al, 2019). Flax is grown for both seeds and fibres in the Nile Delta, in particular, the northern governorates This area is characterized by the prevalence of warm, wet weather during the late period of flax growing season. Such weather favours the epiphytotic spread of the disease when virulent isolate of O. lini occurs Mansour (1998). The present study was conducted in the 2014/2015 and 2015/2016 growing seasons (hereafter referred to as years 2015 and 2016 respectively) to explore the possible effects of six flax cultivars, with varying levels of susceptibility to powdery mildew, on the efficiency of Bellis and Sulphur in controlling the disease under field conditions
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