What is Phytophthora infestans and why is it dangerous?

[Admin]

What is Phytophthora infestans and why is it dangerous?​

Phytophthora infestans was the infective agent of the potato blight that caused the Great Irish Famine (1845–1849), and still remains the most destructive pathogen of solanaceous crops, including tomato and potato. The soya bean root and stem rot agent, Phytophthora sojae, has also caused longstanding problems for…

How do you identify Phytophthora infestans on potatoes?​

People can observe Phytophthora infestans produce sporangia and sporangiophores on the surface of potato stems and leaves. These sporangia and sporangiophores always appear on the lower surface of the foliage.
How can you tell the difference between tuber blight and Phytophthora infestation?
People can observe Phytophthora infestans produce sporangia and sporangiophores on the surface of potato stems and leaves. These sporangia and sporangiophores always appear on the lower surface of the foliage. As for tuber blight, the white mycelium often shows on the tubers’ surface.
What was the effect of Phytophthora infestans in Ireland in 1845?
The effect of Phytophthora infestans in Ireland in 1845–52 was one of the factors which caused over one million to starve to death and forced another two million to emigrate from affected countries. Most commonly referenced is the Great Irish Famine, during the late 1840s.

Is Phytophthora infestans A1 x a2 heterothallic?​

Phytophthora infestans (A1 x A2) heterothallic sexual phase: (a–d) smooth-walled oogonia with amphigynous antheridia and plerotic oospores; photos by Gloria Abad USDA-APHIS-PPQ.

What are the symptoms of phytophthous disease?​

The area between the bark (phloem) and inner wood (xylem) is highly discolored where the Phytophthora organism has been actively colonizing the root or root crown. Many times the cambium has a dull red to reddish brown color.
What plants does Phytophthora cinnamomi infect?
Phytophthora cinnamomi, though, infects thousands of species ranging from club mosses, ferns, cycads, conifers, grasses, lilies, to members of many dicotyledonous families. Many species of Phytophthora are plant pathogens of considerable economic importance.