Pustula tragopogonis

A plant disease caused by the oomycete Albugo tragopogonis''

Pustula tragopogonis

Albugo tragopogonis on a leaf

Pustula tragopogonis, also known as Albugo tragopogonis, is a plant pathogen that causes white rust disease in plants, particularly affecting species within the family Asteraceae. This disease is characterized by the formation of pustules on the leaves and stems of the host plant.

Pathogen

Albugo tragopogonis is an oomycete, a group of fungus-like organisms that are more closely related to algae. Oomycetes are known for causing various plant diseases, including the infamous Phytophthora infestans, which led to the Irish Potato Famine. Albugo tragopogonis specifically targets plants in the genus Tragopogon and other related genera.

Symptoms

The primary symptom of infection by Pustula tragopogonis is the appearance of white pustules on the undersides of leaves. These pustules are filled with sporangia, which are asexual spores that can spread the disease to other plants. Infected plants may also exhibit chlorosis, or yellowing of the leaves, and stunted growth.

Life Cycle

The life cycle of Albugo tragopogonis involves both asexual and sexual reproduction. During the asexual phase, sporangia are produced in the pustules and dispersed by wind or water to new host plants. Under favorable conditions, these sporangia germinate and infect the plant tissue. The sexual phase involves the formation of oospores, which can survive in the soil and serve as a source of inoculum for future infections.

Management

Managing white rust caused by Pustula tragopogonis involves cultural practices, chemical control, and the use of resistant plant varieties. Cultural practices include crop rotation and the removal of infected plant debris to reduce the inoculum in the field. Fungicides may be used to protect plants from infection, although their effectiveness can vary. Breeding and planting resistant varieties is a sustainable approach to managing this disease.

Related pages

• Oomycete
• Plant pathology
• Asteraceae
• Phytophthora infestans