"Oïdium" is a French equivalent of "powdery mildew" (Erysiphelas order).
The French word is a masculine noun. Its singular definite article is "l"* ("the"). Its singular indefinite article is "un" ("a, one").
The pronunciation is "loh-ee-dyoom."
*The masculine singular definite article actually is "le." But the vowel "e" drops before a noun that begins with a vowel. The temporary nature of that drop is indicated by an apostrophe.
"Echte meeldauw" is a Dutch equivalent of "powdery mildew" (Erysiphelas order).
"Echter Mehltau" is a German equivalent of "powdery mildew" (Erysiphales order).
Powdery mildew
Pythium Downy mildew Powdery mildew Rust Phytophthora
Spraying powdery mildew with baking soda added to water does not work. Spray with "Garden Sulphur" or "Garden Copper", both in powder forms, as per package directions every 7 - 10 days. This is also effective for powdery mildew on roses.
M. Ahmedullah has written: 'Powdery mildew of grapes in Washington' -- subject(s): Downy mildew diseases, Mildew
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"Oídio" is a Portuguese equivalent of "powdery mildew" (Erysiphelas order).The Portuguese word is a masculine noun. Its singular definite article is "o" ("the"). Its singular indefinite article is "um" ("a, one").The pronunciation is "oo-EE-djyoo."
Any food that has been modified by biotechnology. For example, many foods are treated for powdery mildew with a product called "Serenade" which contains a living culture of bacteria subtilis....these bacteria make it impossible for the powdery mildew to survive on the host plant.
"Powdery mildew" is an English equivalent of "Echte meeldauw" (Erysiphelas order).
"Powdery mildew" is an English equivalent of "Echter Mehltau" (Erysiphales order).
It sounds like your petunias have a fungal infection called powdery mildew. It is spread by pathogens on the wind but rarely leads to death. The best thing to is to remove the infected parts and water the plants all over to wash of the spores. The only preventative care is to maintain a healthy plant that can resist infection. But before you take action, I suggest you do some research into powdery mildew on petunias to double check what it is.