Influence of Temperature and Moisture on Germination and Germ Tube Elongation of<i>Cercospora arachidicola</i>

Alderman, S. C.

doi:10.1094/phyto-76-715

Cited by 33 publications

(25 citation statements)

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“…However, after 48 hours of incubation in aqueous suspension at temperatures 15-35 °C no significant difference was found in conidia germination. Alderman and Beute (1986) reported optimal conditions for conidia germination and germ tube elongation at 19-25 °C, which was over the optimum found in this experiment. Germination was low between 28 °C and 32 °C, thus agreeing with the lowest germination at 32 °C in this study.…”

Section: Conidia Germination In C Coffeicolamentioning

confidence: 46%

Temperature and light intensity interaction on Cercospora coffeicola sporulation and conidia germination

et al. 2016

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Difficulty in obtaining abundant sporulation in culture of many species of Cercospora may be the limiting factor for studies of biology, systematics, and inoculation of the genus. Therefore, it is necessary to understand the nutritional and environmental requirements that influence mycelial growth, sporulation and germination. As it is difficult to obtain conidia of Cercospora coffeicola in vitro, different temperatures (17, 22, 27, and 32 °C) and light intensities (80, 160, 240, and 320 μmol m -2 s -1 ) were evaluated to optimize pathogen sporulation and assess favorable conditions for spore germination, aiming for a strategy of disease control. The dark treatment (0 μmol m -2 s -1 ) was added for sporulation. A significant interaction was found between temperature and light intensity for both variables. The highest sporulation rate of C. coffeicola occurred at a light intensity of 240 μmol m -2 s -1 and air temperature of 22 °C, reaching 5.9x10 6 con mL -1 . Germination was higher at temperature 17 °C and light intensity of 320 μmol m -2 s -1 , reaching 52%. Interaction between light intensity and temperature proved to influence the processes of sporulation and germination of C. coffeicola.Index terms: Environmental variables; Cercospora leaf spot; Coffea arabica. RESUMOObter abundante esporulação em meio de cultura, para muitas espécies de Cercospora, pode ser o fator limitante em estudos de biologia, sistemática e inoculação das espécies do gênero. Por isso, faz-se necessário o entendimento dos requerimentos nutricionais e ambientais, os quais influenciam o crescimento micelial, a esporulação e a germinação Em razão da dificuldade de obter conídios de Cercospora coffeicola in vitro, objetivou-se avaliar diferentes condições de temperatura (17, 22, 27 e 32 °C) e intensidade luminosa (80, 160, 240 e 320 µmol m -2 s -1 ), com o intuito de otimizar a esporulação do patógeno e avaliar as condições favoráveis à germinação dos conídios, visando a táticas de controle da doença. Para a esporulação, adicionou-se o tratamento escuro (0 µmol m -2 s -1 ). Observou-se interação significativa entre temperatura e intensidade luminosa para ambas as variáveis testadas. A maior esporulação de C. coffeicola foi observada na intensidade de 240 µmol m -2 s -1 e na temperatura de 22 °C, atingindo 5,9x10 6 con mL -1 . Com relação à germinação, esta foi maior na temperatura de 17 °C e na intensidade luminosa de 320 µmol m -2 s -1 , atingindo 52%. A interação entre intensidade luminosa e temperatura do ar, influenciou os processos de esporulação e germinação de C. coffeicola.

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Section: Conidia Germination In C Coffeicolamentioning

confidence: 46%

Temperature and light intensity interaction on Cercospora coffeicola sporulation and conidia germination

et al. 2016

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“…The effect of temperature and duration of wetness on infection of three peanut cultivars by Cercospora arachidicola was reported (Wu et al, 1999). Alderman and Beute (Alderman and Beute, 1986) reported that conidia of Cercospora require a saturated atmosphere to germinate at optimum temperatures of 16 to 25 ºC. Germ tubes elongated at a relative humidity as low as 94.5%.…”

Section: Resultsmentioning

confidence: 97%

Effect of Various Factors on the Development of Leaf Spot Disease in Mulberry

Ghosh

Neela

Mahal

et al. 2012

J. Environ. Sci. & Natural Resources

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Effect of various factors such as temperature, relative humidity, balanced fertilizer and plant spacing on the development of leaf spot disease in mulberry caused by Cercospora moricola was studied. High disease development was recorded in the month of August and September when outdoor temperature and relative humidity were 25-30 ºC and above 80%, respectively. Application of balanced fertilizer and plant spacing on this disease development was also studied and showed a distinct effect on severity of this disease. A balanced dose application of NPK fertilizer decreased disease severity to 6-8%. Balanced fertilizer application in the soil resulted lower infection by leaf pathogen in comparison with imbalanced fertilizer application in the soil. Disease development was also found to be high at close plant spacing (60 × 60) cm than distance spacing (90 × 90) cm.

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“…Monitoring environmental conditions such as rainfall, relative humidity, leaf surface wetness, and temperature to optimize pesticide applications is critical for reducing infection initiation and disease development (Alderman and Beute, 1986;Boyle, 1965, 1966;Shew et al, 1988;Wu et al, 1999). Although chemical pesticides are effective tools for managing diseases and pests, they can be inefficient methods for managing pests due to unintended negative impacts on the ecosystems.…”

Section: Critical Weather Variables For Pest Forecastingmentioning

confidence: 99%

“…Therefore, timely and effective management of the disease rely on good monitoring of environmental conditions, i.e. rainfall, relative humidity, leaf wetness, and temperature, which are required for infection to occur (Alderman and Beute, 1986;Boyle, 1965, 1966;Shew et al, 1988;Wu et al, 1999).…”

Section: Case Study 1: Wrf Model and Early Leaf Spot In Peanutmentioning

confidence: 99%