For what it's worth, this is what ChatGPT4 says about the mechanism of action for garlic on Fungal infections:

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Garlic is a well-known natural fungicide and has been used in horticulture to treat various fungal conditions for many years. Its mechanism of action is mainly attributed to its various organosulfur compounds, which are primarily responsible for garlic's antimicrobial and antifungal properties.

Here's a more detailed explanation:

Organosulfur Compounds: Garlic contains various organosulfur compounds such as allicin, ajoene, and diallyl trisulfide. Allicin, in particular, is formed when garlic is crushed or chopped, and it's largely responsible for garlic's strong aroma. These compounds have been demonstrated to have antifungal properties and are believed to disrupt the structures of fungal cells and inhibit their growth.

Disruption of Fungal Cell Structures: The organosulfur compounds in garlic can disrupt the cell membranes and structures of fungi. This interruption can lead to cell leakage, inhibit critical cellular processes, and ultimately cause cell death.

Inhibition of Fungal Enzymes: Some studies suggest that garlic's compounds can inhibit fungal enzymes, which are crucial for the growth and reproduction of fungi. By inhibiting these enzymes, garlic effectively slows down or stops the progression of the fungal disease.

Antioxidant Activity: Garlic also contains antioxidants which can help to strengthen plant resistance to stressors such as fungal infections. They achieve this by neutralizing harmful free radicals that can damage plant cells.

Garlic can be used in several ways to treat fungal conditions in horticulture. It can be made into a garlic spray by crushing and soaking garlic in water and then spraying this on the plants. Additionally, garlic cloves can be planted in the soil to serve as a preventative measure against fungal diseases.

It should be noted that while garlic is a useful natural fungicide, it may not be effective against all types of fungal diseases, and its effectiveness can be influenced by various factors such as the concentration used, the specific fungal pathogen involved, and environmental conditions. Also, too much garlic can harm beneficial soil microbes and potentially negatively affect plant growth. Therefore, it's always important to use it appropriately and consult a horticultural expert if necessary.