Aggressiveness of Leveillula taurica on pepper

International audienceThe aggressiveness of several isolates of L. taurica from different locations in France, Sudan and Italy, on pepper (Capsicum annuum) was investigated. A susceptible line (Vania) and a partially resistant line (PM687) were used in the study. Evaluations of disease severity were carried out 5 times a week, from 7 days after inoculation until 49 days after inoculation. All isolates of L. taurica were virulent to the susceptible line, wiith mild symptoms observed after 14 days. Only weak symptoms were observed on the partially resistant line for 4 of the 6 isolates, and no symptoms were observed for the other 2 isolates. The most aggressive and least aggressive isolates were both obtained from Sudan. It is suggested that levels of aggressiveness can be determined on the pepper line Vania, and that aggressiveness may not be related to the geographic origin of the isolate

Aggressiveness of Leveillula taurica on pepper

International audienceThe aggressiveness of several isolates of L. taurica from different locations in France, Sudan and Italy, on pepper (Capsicum annuum) was investigated. A susceptible line (Vania) and a partially resistant line (PM687) were used in the study. Evaluations of disease severity were carried out 5 times a week, from 7 days after inoculation until 49 days after inoculation. All isolates of L. taurica were virulent to the susceptible line, wiith mild symptoms observed after 14 days. Only weak symptoms were observed on the partially resistant line for 4 of the 6 isolates, and no symptoms were observed for the other 2 isolates. The most aggressive and least aggressive isolates were both obtained from Sudan. It is suggested that levels of aggressiveness can be determined on the pepper line Vania, and that aggressiveness may not be related to the geographic origin of the isolate

Aggressiveness of Leveillula taurica on peppers.

International audienc

Aggressiveness of Leveillula taurica on peppers.

International audienc

Effect of temperature on germination and germ tube elongation of Leveillula taurica.

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Effect of temperature on germination and germ tube elongation of Leveillula taurica.

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Epidémiologie et contrôle de l'oïdium du piment

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Inoculum production and long-term conservation methods for cucurbits and tomato powdery mildews

International audienceThe behaviour of cucurbit powdery mildews (Podosphaera xanthii and Golovinomyces cichoracearum) and tomato powdery mildew (Oidium neolycopersici) infesting detached cotyledons of Lagenaria leucantha cv. 'Minibottle' was studied in order to develop an easy culture method for pure inoculum production, High spore production was found with a combination of mannitol (0.1 m), sucrose (0.02 m) and agar (8 g l(-1)) in the cotyledon survival medium. Sporulation on cotyledons and viability of conidia were affected by the age of culture for the three species of powdery mildew tested. The age of cotyledons had also an impact of the spore production. This method was used to produce large amounts of inoculum for P. xanthii, G. cichoracearum and O. neolycopersici and enable the development of other species of powdery mildew like Leveillula taurica. Freezing conidia in liquid nitrogen enabled the long-term conservation of P. xanthii without any loss of virulence. The same method was unsuccessful with G. cichotacearum, and L. taurica and partly successful with O. neolycopersici

An artificial inoculation method to test the resistance of pepper to <em>Leveillula taurica</em> on detached organs

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