humus wrote:Ahmed wrote:Natural causes cannot be ruled out, because viral infections can lead to deformation of plant organs.
I don't know anything about it but I will dig this track.
Examples:
Peas: the common pea mosaic, caused by the Pea Enation Mosaic Virus (PEMV); deformation of stems, leaves and pods
http://www.unilet.fr/cultures/pois/Virose.php
More generally:
Damage caused by plant viruses
In a plant, phyto-viruses infect the tissues of the roots or stems as well as those of the leaves. They cause a generalized disease of the plant, which then tends to wither away.
Note: only meristematic tissues are free from it. These are tissues made up of dividing / multiplying cells ensuring the growth of plants in length and thickness.
Damage to the foliage: most often, the foliage takes on a "mosaic" appearance, ie the leaves (especially the youngest) take on an irregular color. On the other hand, the leaves can become deformed: reduced size, embossed or elongated appearance, appearance of blisters ... Finally, they can necrode more or less completely, yellowing and then drying.
Damage to flowering and fruiting: many flowers die off and abort. Fruits or vegetables are absent or less numerous. Those that persist are smaller and necrotic, ripen more slowly and appear unappetizing.
Damage to the stems: the growth of the stems slows down and necrosis also appears. The plants wither away.
1 Recognize plant viruses
The signs of plant virosis vary greatly depending on the infected species, the state of cultivation and the climate, you will diagnose it mainly by observing the mosaic of the foliage: irregular coloring or even discoloration of the young leaves especially. This characteristic sign is more or less associated with deformations, necrosis as well as yellowing of older leaves and then drying out.
https://jardinage.ooreka.fr/fiche/voir/ ... -vegetales