Effect of temperature on infection and development of powdery mildew on cucumber

Trecate, Letizia; Sedláková, B.; Mieslerová, B.; Manstretta, Valentina; Rossi, Vittorio; Lebeda, A.

doi:10.1111/ppa.13038

Cited by 26 publications

(16 citation statements)

References 29 publications

(54 reference statements)

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“…eres growth were modelled using a Bete and a logistic equation, respectively. The approach has been widely described in the literature for other pathosystems, e.g., powdery mildew on cucumber [ 53 ] and maize ear rot [ 54 ], as well as for more complex situations including fungal interactions [ 55 ]. The production of pynidial conidiomata and cirrhi development were well described based on GDD as the independent variable in a logistic equation.…”

Section: Discussionmentioning

confidence: 99%

Ecology of Diaporthe eres, the causal agent of hazelnut defects

et al. 2021

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Diaporthe eres has been recently reported as the causal agent of hazelnut defects, with characteristic brown spots on the kernels surface and internal fruit discoloration. Knowledge regarding the ecology of this fungus is poor but, is critical to support a rationale and effective hazelnut crop protection strategy. Therefore, a study was performed to describe and model the effect of different abiotic factors such as temperature (T, 5–35°C, step 5°C) and water activity (aw 0.83–0.99, step 0.03) regimes on D. eres mycelial growth, pycnidial conidiomata development and asexual spore production during a 60-day incubation period. Alpha conidia germination was tested in the same T range and at different relative humidities (RH = 94, 97 and 100%) over 48 h incubation period. Fungal growth was observed from the first visual observation; regarding pycnidia and cirrhi, their development started after 8 and 19 days of incubation, respectively and increased over time. The optimum T for growth was 20–25°C and for pycnidia and cirrhi development was 30°C; aw ≥ 0.98 was optimal for the tested steps of the fungal cycle. The best condition for conidial germination of D. eres was at 25°C with RH = 100%. Quantitative data obtained were fitted using non- linear regression functions (Bete, logistic and polynomial), which provided a very good fit of the biological process (R2 = 0.793–0.987). These functions could be the basis for the development of a predictive model for the infection of D. eres of hazelnuts.

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Section: Discussionmentioning

confidence: 99%

Ecology of Diaporthe eres, the causal agent of hazelnut defects

et al. 2021

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“…Among these diseases, powdery mildew, caused by the fungus Podosphaera xanthii (Castagne) U. Braun & Shishkoff (Syn. Sphaerotheca fuliginea), represents a challenge for both growers and researchers [9,10]. This pathogen infects the shoot system and causes a severe reduction in crop productivity [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effective Management of Cucumber Powdery Mildew with Essential Oils

et al. 2021

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This research evaluated the efficacy of essential oils in the management of cucumber powdery mildew. Essential oils of lemongrass, lemon, thyme, peppermint, abundance blend, purification blend, and thieves blend were tested in vitro and under greenhouse conditions in two separate experiments. The effects of essential oils were tested against powdery mildew disease at concentrations of 1.0–2.5 mL/L, and the consequent impact of the oils on plant growth was evaluated. Powdery mildew fungus, Podosphaera xanthii, was identified using sequencing of the ITS region. The essential oils significantly reduced disease incidence up to 77.3% compared with the positive control (p < 0.5). Moreover, the essential oils increased the plant length (up to 187 cm), leaf area (up to 27.5 cm2), fresh weight (up to 123 g), dry weight (up to 22.5 g), number of flowers (16.3), and metabolite content compared with the positive control (p < 0.5). Cell membrane injury decreased significantly in the oil-treated pants (p < 0.5), indicating the protective effect of essential oils. This study recommends the application of essential oils in an appropriate dose (2.5 mL/L) to protect cucumber plants against powdery mildew. Overdose of the oils (more than 2.5 mL/L) should be avoided due to adverse effects.

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“…Temperature significantly affected conidial germination and infection, as observed on other powdery mildew pathogens such as O. neolycopersici, P. xanthii, and G. orontii (Mieslerová and Lebeda, 2010;Trecate et al, 2019). In this study, the germination percentage was lower and more time was needed to germinate at 10 and 35°C than at the other tested temperatures.…”

Section: Discussionmentioning

confidence: 49%

“…neolycopersici, Podosphaera xanthii, and Golovinomyces orontii, a conidium can produce more than one germ tube during germination, and the formation of the secondary germ tube is used as the indicator of successful infection (Mieslerová and Lebeda, 2010;Trecate et al, 2019). However, for rubber tree powdery mildew, a conidium first produces a single germ tube, followed by formation of an appressorium from the germ tube, and finally a hypha from the appressorium or germ tube directly (Figure 1).…”

Section: Effect Of Temperature and Leaf Age On Conidial Germinationmentioning

confidence: 99%

Effects of temperature and leaf age on conidial germination and disease development of powdery mildew on rubber tree

Cao

Che

et al. 2020

Plant Pathology

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Powdery mildew is an important disease of rubber trees worldwide. To assess the effects of temperature and leaf age on conidial germination and disease development, conidia were inoculated onto rubber tree seedlings with leaves at three phenological stages (copper bronze, colour‐changing, and light green) and then incubated at six constant temperatures (10, 15, 20, 25, 30, and 35°C). Leaf age did not affect conidial germination (p = .296) whilst temperature did (p < .0001), although conidia were able to germinate at all tested temperatures. The estimated optimal temperature for conidial germination was 23.2°C. Leaf age, temperature, and their interactions had significant effects on conidial infection and hypha number (p < .0001). At 10 and 35°C, more than 2 and 4 days were needed for infection to complete, respectively, compared to <2, 1, 0.5, and 0.5 days for 15, 20, 25, and 35°C, respectively. Sporulation and mildew symptoms were only observed on those inoculated leaves of all stages at 20 and 25°C, and at the copper bronze stage only at 15°C. The latent period on the copper bronze leaves at 15°C was longer (9 days) than at 20 and 25°C (4 days). The latent period at 20 and 25°C increased from 4 to 7 days as the leaf development stage increased from copper bronze to light green. Therefore, temperature affected germination and postgermination growth of rubber tree powdery mildew, whereas leaf age primarily affected postgermination growth of the pathogen.

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Effect of temperature on infection and development of powdery mildew on cucumber

Cited by 26 publications

References 29 publications

Ecology of Diaporthe eres, the causal agent of hazelnut defects

Ecology of Diaporthe eres, the causal agent of hazelnut defects

Effective Management of Cucumber Powdery Mildew with Essential Oils

Effects of temperature and leaf age on conidial germination and disease development of powdery mildew on rubber tree

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