The Hemileia Vastatrix, leaf rust fungus, can easily wipe out a plantation, and has destroyed the whole know world's crops in the past. This is a serious disease. A note from one who is not a botanist. Plants do not take their nutrients from the soil. No plant takes it's nutrients from the soil.
Plants get their nutrients from the fungus in the soil.
Thus, although the plant looks as though it is getting it's nutrients from fertilization, it actually is not. The fungus is getting it's food from fertilization and the plant is getting it's food from the fungus. Use the back arrow, or back function of your browser to go back a page.