Final diagnosis


Aphids

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High concentration of <b> aphids </b> at different stages of development under the blade of this zucchini leaf.
Fumagine
The strong presence of aphids is at the origin of the development of <b> sooty mold </b> on the stem and young fruits of this zucchini plant. Note that the fruits are affected by <b> Zucchini yellow mosaic virus </b> (<i> Zucchini yellow mosaic virus </i>, ZYMV). This is not surprising because this virus is transmitted by aphids.
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Cotton aphid : <i><b>Aphis gossypii</b></i>.
Green peach aphid :<b> <i>Myzus persicae</i></b>
Green potato aphid: <i><b>Macrosiphum euphorbiae</b></i>.
Foxglove and potato striped aphid : <b><i>Aulacortum solani</i></b>.