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Austropuccinia is a monotypic genus of rust (a type of plant pathogen) native to South America with the only species Austropuccinia psidii, commonly known as myrtle rust, guava rust, or ʻōhiʻa rust. It affects plants in the family Myrtaceae. It is a member of the fungal complex called the guava rust (Puccinia psidii) group. [3]
Pink rot Trichothecium roseum. Cephalothecium roseum; Powdery mildew Oidium spp. Rhizoctonia seed and root rot Rhizoctonia solani; Thanatephorus cucumeris [teleomorph] Root and bark rot Fusarium spp. Root rot Pythium spp. Rosellinia root rot Rosellinia bunodes; Rusty blight Colletotrichum gloeosporioides. Colletotrichum nigrum; Scab (fruit ...
Pseudocercospora purpurea is a fungal plant pathogen that causes a leaf spot on the avocado. Species Cercospora purpurea was originally found on the leaves of Persea species in Georgia, USA in 1878. [2] before the species was transferred to the Pseudocercospora genus in 1976. [1] It is also found in New Zealand and Australia, [3] [4] and Tolima ...
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Theses leaf spots are an orange-brown rust in color and usually occur entirely on the upper leaf surface, although leaf spots on the undersides of infected leaves have been reported. The spots are fuzzy in texture and approximately 2 cm (0.8 in) in diameter. [ 2 ]
On the apple tree, the infections occur on leaves, fruit and young twigs. [4] The brightly colored spots produced on the leaves make it easy to identify. Small, yellow-orange spots appear on the upper surfaces of the leaves, anytime from April to June. [5] These spots gradually enlarge and turn orange or red and may show concentric rings of color.
Field and laboratory observations have since confirmed that the redbay ambrosia beetle will infest avocado trees, although there may be some variation in how susceptible different avocado cultivars are to the laurel wilt fungus. [11] In 2011, laurel wilt-infected trees were detected in Miami-Dade County, near areas of commercial avocado groves. [6]
Phytophthora cinnamomi is the leading cause of damage to avocado trees, and is commonly known as "root rot" amongst avocado farmers. Since the 1940s various breeds of root rot-resistant avocados have been developed to minimize tree damage. Damaged trees generally die or become unproductive within three to five years.
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