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Most commonly, economically detrimental infections occur in guava. [2] Guava is considered to be a susceptible host, and the leaf spot symptoms can grow to be severe enough to reduce plant vigor and cause defoliation. In guava, Cephaleuros virescens can cause fruit spots as well, leading to a reduction in crop yield. [citation needed]
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]
The alga is parasitic on some important economic plants of the tropics and subtropics such as tea, coffee, mango and guava causing damage limited to the area of algal growth on leaves (algal leaf spot), or killing new shoots, or disfiguring fruit. [3] Spores germinate on plants in the rainy season. [4]
The common guava Psidium guajava (lemon guava, apple guava) is a small tree in the myrtle family , native to Mexico, Central America, the Caribbean and northern South America. [2] The name guava is also given to some other species in the genus Psidium such as strawberry guava (Psidium cattleyanum) and to the pineapple guava, Feijoa sellowiana.
Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales . Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive.
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Purple leaf sheath Hemiparasitic bacteria and fungi Pyrenochaeta stalk rot and root rot Phoma terrestris = Pyrenochaeta terrestris: Pythium root rot Pythium spp. Pythium arrhenomanes Pythium graminicola. Pythium stalk rot Pythium aphanidermatum = Pythium butleri: Red kernel disease. Ear mold, leaf and seed rot Epicoccum nigrum: Rhizoctonia ear ...
A new species of Pestalotiopsis from leaf spots on Licuala grandis from Hainan, China was found in 2013. [19] Neopestalotiopsis and Pestalotiopsis species were noted as causal agents of guava scab in Colombia. [20] In 2018, the first report of leaf spot disease of elephant apple (Dillenia indica) caused by Pestalotiopsis sp. occurred in India. [21]