Crown symptoms
These are some of the symptoms you might see on the crown of the coconut. Click on the possible causes of the symptoms to find out more.
Symptom |
Possible cause |
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Coconut palms with dropping fronds or spear leaf only (© Luigi Guarino, Global Crop Diversity Trust) |
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Outer parts of the frond turning yellow and curling over. The older fronds may have turned brown and be drooped towards the stem (© Northern Australia Quarantine Strategy, Department of Agriculture and Water Resources, Australia) |
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Yellowed and broken mid-section with new green fronds emerging from the top of the crown (© Jean-Pierre Labouisse, CIRAD) |
Coconut foliar decay | |
Malayan dwarf seedling showing yellowed mid-section and dropping fronds (© John Randles, Waite Agricultural Research Institute) |
Coconut foliar decay | |
Malayan Dwarf seedling with burnt-looking leaflet damage (© PestNet) |
Additional symptoms of coconut hispine beetle include:
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Few to many fronds showing wedge or v-shapes (© Pacific Biosecurity) |
Coconut rhinoceros beetle -Orcytes Additional symptoms of coconut rhinoceros beetle include:
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Coconut palms showing defoliated crowns (© Richard Markham, ACIAR) |
Additional symptoms of coconut sexava treehopper include:
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A coconut plantation showing many yellowed palms. The top of the palm may still show green fronds (© Merle Shepard and Gerald Carner, Clemson University) |
This symptom may be confused with lethal yellowing |
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Crown of a palm showing wilted fronds and dead lower leaves (© Monica Elliott, USDA APHIS ITP, Bugwood.org) |
Ganoderma butt rot | |
Dead coconut palms with yellow fronds at the top and dead brown fronds hanging down (L) and without the crown (R) (© Nigel A. Harrison, University of Florida) |
Additional symptoms of lethal yellowing include:
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Red-greyish brown leaves showing throughout green healthy leaves (Malayan Dwarf variety) (© Nigel A. Harrison, University of Florida) |
Additional symptoms of lethal yellowing include:
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Lower third of a coconut palm with most of the leaflets yellowed and dead (browning at the frond tips) (© Jorge Peña, University of Florida) |
Red palm mite | |
Coconut palm with bronzed, dead fronds and broken fronds hanging down towards the ground (© Monica L. Elliott, University of Florida) |
Red ring nematode | |
Coconut palm with a thin and battered crown (© George Wall, formerly CALS/AES University of Guam) |
Tinangaja - also look for a tapered trunk |