Final diagnosis


Internal powdery mildew of cucurbitaceae

Piment-Plante
Chlorotic, sometimes angular spots have formed on these pepper leaves. <b><i>Leveillula taurica</i></b> (internal powdery mildew, powdery mildew)
Powdery mildew spots on pepper leaves. Note which are chlorotic, with diffuse to vein-delimited outlines. <b><i>Leveillula taurica</i></b> (internal powdery mildew, powdery mildew)
Appearance of powdery mildew spots on the underside of a pepper leaf. Locally, their delimitation by the ribs can be clearly distinguished. <b><i>Leveillula taurica</i></b> (internal powdery mildew, powdery mildew)
Discreet spots of powdery mildew on pepper leaves. <b><i>Leveillula taurica</i></b> (internal powdery mildew, powdery mildew)
Detail of spots visible under the blade of a pepper leaf. Note the presence of a discreet white to greyish down. <b><i>Leveillula taurica</i></b> (internal powdery mildew, powdery mildew)
Under this pepper leaf, many powdery white spots of powdery mildew have coalesced. <b><i>Leveillula taurica</i></b> (internal powdery mildew, powdery mildew)
Under the blade of this pepper leaf, <b><i>Leveillula taurica</i></b> has sporulated enormously. (internal powdery mildew, powdery mildew)
A few bright yellow spots, sometimes angular, dot this tomato leaflet. <b><i>Leveillula taurica</i></b> (internal powdery mildew, powdery mildew)
Leveillula11
On this tomato leaflet, many spots have finally turned brown and have gradually become necrotic in their center. <b><i>Leveillula taurica</i></b> (internal powdery mildew, powdery mildew)
On the underside of the blade of this tomato leaf, the spots are rather yellowish and sometimes have a light brown stippling giving them a dull appearance. <b><i>Leveillula taurica</i></b> (internal powdery mildew, powdery mildew)
Leveillula11
Numerous chlorotic and vein-delimited broods the underside of this tomato leaflet. <b><i>Leveillula taurica</i></b> discreetly sporulated in places. (internal powdery mildew, powdery mildew)
Leveillula15
Microscopie1.jpg
Heavy sporulation of <b><i>Leveillula taurica</i></b> on the underside of a pepper leaf. (internal powdery mildew, powdery mildew)
Conidiophores and conidia of <b><i>Leveillula taurica</i></b> observed under binocular microscope. Oidium (powdery mildew)
Conidiophores sometimes bearing pointed conidia of <b><i>Leveillula taurica</i></b>. (internal powdery mildew, powdery mildew)
Detail of a characteristic conidium of <b><i>Leveillula taurica</i></b> (internal powdery mildew)
Appearance of various conidia of <b><i>Leveillula taurica</i></b> observed under a light microscope. The first conidia formed are more or less lanceolate and pointed at their end. The seconds are more or less ellipsoidal to cylindrical. Their measurements are variable: 30-80 x 12-22 µm. (oidium, powdery mildew)