Abstract
Royal palm (Roystonea regia) belongs to family Roystoneae. It is an attractive ornamental plant present all around the tropical and sub-tropical regions. Where it provides nutrition and shelter to several birds, bats, and frogs. Its seed is consumed by livestock for oil and feed purpose, and the trunk is used in construction of huts, simple shelters, bridges. The palm is susceptible to several diseases that can be avoided or minimized by adopting various cultural practices. Fusarium wilt is one of the most severe disease of this palm. Necrosis from one side of the pinnae followed by brown stri** around the rachis and dieback from leaf tip is the characteristic symptom of this disease. Application of bio-fungicides at seedling stage may help in preventing the disease. Premature drop** of fruit following foliar necrosis is the initial symptom of lethal yellowing caused by phytoplasmas. Injection of OTC antibiotic in the palm tree trunk reduces the disease severity. Helmintosporium, Pestalotiopsis, Cylindrocladium or Cercospora may cause leaf spot disease in palms that can be managed by avoiding overhead irrigation and several other cultural practices. False smuts (Graphiola leaf spots, due to Graphiola spp.) appear as sorus initially turn black producing yellowish spores and small emerging fibres. Cultural practices help to reduce the disease as no fungicide is yet recommended for its management. Ganoderma rot due to the fungus Ganoderma zonatum shows severe wilting and logging of lower leaves. Discarding the conk may be required to supress the disease dissemination. Phytophtora spp., Pythium spp. or Thielaviopsis spp. maybe involved in bud rot disease of the palm and can be managed by avoiding overhead irrigation and applying copper-based fungicides.
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Bajwa, R.T., Shakeel, Q., Raheel, M., Rashid, I. (2020). Fungal Diseases of Royal Palm (Roystonea regia). In: Ul Haq, I., Ijaz, S. (eds) Etiology and Integrated Management of Economically Important Fungal Diseases of Ornamental Palms. Sustainability in Plant and Crop Protection, vol 16. Springer, Cham. https://doi.org/10.1007/978-3-030-56330-1_13
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