Final diagnosis


Botrytis cinerea (gray mold)

Lettuce starting to wilt. <b> <i> Botrytis cinerea </i> </b> ("gray mold")
Once the collar is girdled, the salad suddenly wilts. <b> <i> Botrytis cinerea </i> </b> ("gray mold")
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A necrotic condition, beige to light brown, developed on a young leaf in contact with the soil. Subsequently, she gained several leaves and the crown of this young lettuce. A gray mold is visible on certain portions of damaged tissue. <b> <i> Botrytis cinerea </i> </b> ("gray mold")
<i><b>Botrytis cinerea</b></i> (gray mold) 7
<i><b>Botrytis cinerea</b></i> (Gray mold) 11
Eventually, whatever leaves are attacked, the salad can rot completely and be completely covered by gray mold. <b> <i> Botrytis cinerea </i> </b> ("gray mold")
<i><b>Botrytis cinerea</b></i> (grey mold)
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A moist, beige to brownish lesion gradually develops on the leaf blade of this lettuce. <b> <i> Botrytis cinerea </i> </b> (gray mold)
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Large wet spots beginning to necrosis spread over two leaves. We can clearly distinguish the concentric "patterns". <b> <i> Botrytis cinerea </i> </b> ("<i> Botrytis </i> leaf spot")
Subsequently, the stain takes on a beige to light brown tint. It should be noted that, in this case, it started at the periphery of the limbus. <b> <i> Botrytis cinerea </i> </b> ("gray mold")
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<b> <i> Botrytis cinerea </i> </b> ("gray mold") can also be found in the heart of salads; the altered tissues, initially damp and brown, gradually become covered with the famous gray mold. The leaves may turn yellow due to the alteration of the petioles.
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Wet rot invading the head of a lettuce; a gray mold partially covers it. <b> <i> Botrytis cinerea </i> </b> ("gray mold")
The crown of this lettuce is completely destroyed by a wet rot that started from several leaves in contact with the ground. <b> <i> Botrytis cinerea </i> </b> ("gray mold")
Black sclerotia, more or less round, are more rarely associated with <b> <i> Botrytis cinerea </i> </b> ("gray mold") attacks.
After having attacked the lower leaves, <b> <i> Botrytis cinerea </i> </b> ("gray mold") gains the interior of the taproot, at the level of the collar; all the tissues are degraded, even the vessels.
<i> <b> Botrytis cinerea </b> </i> ("gray mold") produces an abundant and typical gray mold on affected tissue.
<i><b>Botrytis cinerea</b></i> (Gray mold) 8
On this parchinoid spot, we can clearly see the conidiophores and conidia constituting the gray mold of <i> <b> Botrytis cinerea </b> </i> (gray mold)
This gray mold consists of many conidiophores that can be distinguished very well with a binocular magnifying glass. <b> <i> Botrytis cinerea </i> </b> ("gray mold")
<i> <b> Botrytis cinerea </b> </i> ("gray mold") produces strong, long conidiophores, irregularly branched, gradually melanating at the base.
The conidiophores are branched and carry numerous conidia. <b> <i> Botrytis cinerea </i> </b> ("gray mold")
Conidia form at the end of the conidiophores where a bulb-shaped bulge is observed. They are carried by a sterigma, have an ovoid to elliptical shape and a hyaline to slightly pigmented coloration (6-18 x 4-11 µm). <b> <i> Botrytis cinerea </i> </b> ("gray mold")
The rot is now widespread on other leaves; it completely damaged the collar. There is a gray mold as well as a few small black sclerotia on the tissues. Portions of the leaf sometimes react to infection and take on a reddish tinge, especially at the taproot. <b> <i> Botrytis cinerea </i> </b> ("gray mold")