Relevant Data About Sooty Mold
Sooty mold is a fungus that feeds on the sweet and sticky substance, "honeydew", secreted by Aphids. It is therefore closely linked with the presence of Aphids, especially bean aphids, that secrete honeydew in great quantities.
Harm Caused by Sooty mold
Black spots spread on the leaves and prevent the leaves from capturing the sun and inhibit therefore the growth of the plant.
- Take measures for Aphids control on time to prevent sooty mold spreading. If Aphids invasion has already taken place, using the help of Lacewings will be particularly relevant, since their larvae feed on Aphids and imagines on both.
- If possible, wash the leaves by hand, taking care of not harming Aphids predators like Ladybirds, Lacewings, hoverflies (see Hoverfly and their lavae which are very likely to be present. Don't use a pressure waterjet if you notice the presence of those useful animals.
- You can use Wormwood tea to wash gently the leaves: the bitter taste of wormwood will keep further Aphids away.
- Horsetail Concentrate to strengthen the plant's immune system. You can e.g. use this product to wash gently the leaves.
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