Phytophthora citrophthora

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Phytophthora citrophthora
Author: JKI Institute for Microbiology
Source: Open Media

Phytophthora citrophthora (R.E. Sm. & E.H. Sm.) Leonian 1925 - (citrus gummosis)

The oomycete is widespread, especially in warmer regions and causes brown rot, gummosis and root rot on citrus. The pathogen is often soil-borne and symptoms start with foot rot near the soil and gum oozing from the trunk. Leaves and fruits may also become infected. The pathogen infects many other crops, e.g. peach or cacao. It might spread through contaminated irrigation water, rain splashes or infected seeds.

For control, proper drainage, resistant cultivars and fungicides are recommended. Sporangia are egg-shaped, lemon-shaped or pear-shaped, mono- and occasionally bipapillate and 40-60 x 25-35 µm large. Chlamydospores are spherical around 30 µm in diameter. Only mating type A1 is known.

Vernacular names
• Deutsch: Gummose der Zitrusarten
Braunfäule des Zitrus
• English: gummosis of citrus
citrus brown rot
root rot of citrus
• Español: gomosis de los agrios
• Français: gommose des citrus