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• W2066471639 abstract "During annual disease surveys of dill (Anethum graveolens) in September 2001 and May 2002, sporadic symptoms typical of powdery mildew were observed in many fields assessed in the eastern Mediterranean coastal regions of Hatay Province, Turkey. White, epiphytic mycelia and conidia, characteristic of a powdery mildew, were present on leaves, stems and inflorescences. Severely diseased leaves became twisted, and the disease possibly contributed to premature senescence and drying of the plant. Mycelial growth was amphigenous, forming thin, irregular white patches, sometimes effused to cover the whole leaf surface, stem and inflorescences, and had well developed multilobed appressoria. Simple straight conidiophores developed mostly singly from a hyphal cell, arising from the upper part of mother cells. Cylindrical foot cells (30–35 × 7·5–9 µm) were followed by one or two shorter cells (17·5–22·5 × 7·5–9 µm). Cylindrical oval to fusiform conidia (30–38 × 12–15 µm) were produced singly without conspicuous fibrosin bodies. The length to width ratios of conidia ranged from 1·9 to 3. Conidia germinated at the ends by producing four to five germ tubes. Germ tubes formed lobed appressoria. The cleistothecia were found on leaves, stems and inflorescences, and were spherical, gregarious and measured 80–125·5 µm in diameter. Appendages were myceloid with branched tips, brown to black and 88–145 µm in length and 4–7 µm in diameter. Each cleistothecium contained four to six round to ovoid asci (45–62·5 × 25–37·5 µm). The ascus contained three to five ellipsoid to ovoid ascospores (22·5–25 × 10–15 µm). Based on morphological characteristics, the causal agent of dill powdery mildew was identified as Erysiphe heraclei (Shin, 2000). Pathogenicity tests were conducted on 2-month-old glasshouse-grown dill plants, variety Bereketli. These plants were inoculated by shaking fresh conidia from naturally infected plants having abundant sporulation onto the leaves of healthy plants. Inoculated plants were kept in a moist chamber (100% RH) at 22°C for 2 days, then moved into a growth chamber at 22 ± 2°C/16 ± 2°C (day/night temperatures), 75% RH with a 16 h photoperiod. Inoculated plants developed powdery mildew symptoms 12–15 days after inoculation. The symptoms on inoculated plants and the morphological characteristics of the pathogen were similar to those observed on naturally infected plants. No symptoms developed on control plants. This is the first report of powdery mildew on dill in Turkey, and also the first record of E. heraclei in this country. Previous reports list E. heraclei on dill in Iran (Sharifnabi & Nekoei, 1997), India (Upadhyaya & Gupta, 1992) and Taiwan (Tsay, 1990). Erysiphe heraclei was reported on several host plants belonging to the Apiaceae such as parsley, celery, carrot and fennel (Shin, 2000)." @default.
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• W2066471639 date "2003-06-01" @default.
• W2066471639 modified "2023-10-16" @default.
• W2066471639 title "First report of powdery mildew caused by Erysiphe heraclei on dill (Anethum graveolens) in Turkey" @default.
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• W2066471639 doi "https://doi.org/10.1046/j.1365-3059.2003.00845.x" @default.
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