Bud rot (coconut)
The growing bud rots at the heart of the crown — the spindle leaf withers and pulls out with a foul smell, and a killed bud kills the palm.
- Pathogen
- Phytophthora palmivora (fungus-like)
- Spreads by
- Rain-splashed spores in wet weather
- Favoured by
- Wet, humid monsoon; young palms
- Main risk
- Bud killed → whole palm dies
Overview
Bud rot is a serious disease of coconut (and other palms) caused mainly by the fungus-like organism Phytophthora palmivora. It attacks the tender growing bud (the central spindle/heart) at the top of the crown. The first sign is the youngest, central spindle leaf turning pale and withering; the affected bud tissue rots into a soft, slimy mass with a characteristic foul smell, and the spindle leaf can be pulled out easily.
Because the bud is the single growing point of the palm, once it is fully rotted the crown collapses and the whole palm dies — unlike a leaf disease, there is no recovery. Younger palms are especially vulnerable. It is favoured by wet, humid, monsoon weather with continuous rain and high humidity. Because it can be fatal, management is about early detection and prompt action: cleaning out the rotted tissue, applying copper paste/fungicide to the wound and bud, and prophylactic crown sprays of neighbouring palms before and during the wet season.
How to identify it
- The youngest, central spindle leaf turning pale and withering at the top of the crown.
- The affected bud rotting into a soft, slimy mass with a characteristic foul smell.
- The spindle leaf pulling out easily from the rotted bud.
- If the bud is fully killed, the crown collapses and the whole palm dies — no recovery.
What causes it and when
- Mainly Phytophthora palmivora, spread by rain-splashed spores in wet, humid weather.
- Favoured by the wet, humid monsoon with continuous rain and high humidity.
- Younger palms are especially vulnerable, and crown injuries and standing water worsen it.
- Attacks the single growing bud, so unlike a leaf disease it can be fatal to the palm.
Cultural & organic control
- Inspect palms in and after the wet season and act at the very first sign — early detection is decisive.
- On an early-affected palm, clean out all the rotted tissue from the bud down to healthy tissue.
- Provide good drainage and crown hygiene, and remove and burn severely affected/dead crowns to cut the spore source.
- Avoid crown injuries and keep the palm vigorous with balanced nutrition.
Chemical control
- After cleaning the wound on an early-affected palm, apply a copper paste (e.g. Bordeaux paste) / recommended fungicide and protect the exposed bud from rain.
- As prophylaxis, give crown/spindle sprays of a CIB&RC-registered copper-based (Bordeaux mixture) or recommended fungicide to neighbouring palms before and during the wet season.
- Repeat prophylactic sprays through prolonged wet spells as recommended.
- Confirm the current copper-paste and prophylactic-spray schedule for your area with your local KVK.
Prevent it coming back
- Make wet-season inspection and prompt action on the first affected palm the routine.
- Give prophylactic crown sprays to surrounding palms before/during the monsoon, especially near an outbreak.
- Keep drainage, crown hygiene and palm vigour up, and remove dead crowns that harbour the pathogen.
Crops most at risk
Where this problem is called out in our crop guides — open a crop for the full package of practices.
Frequently asked questions
The central spindle leaf of my coconut is withering and the bud smells foul. What is it?
A pale, withering central spindle leaf that pulls out easily, with a soft, slimy, foul-smelling rot at the bud, is bud rot (Phytophthora) — a potentially fatal disease because the bud is the palm’s only growing point. Act at once on an early-affected palm: clean out the rotted tissue to healthy tissue, apply copper (Bordeaux) paste and protect it from rain, and give prophylactic crown sprays to neighbouring palms in the wet season.
Why is bud rot fatal when many leaf diseases are not?
Because a palm has a single growing point — the central bud at the top of the crown — and bud rot destroys exactly that. A leaf disease damages leaves the palm can replace, but once the bud is fully rotted there is no new growth possible and the crown collapses and the palm dies. That is why bud rot demands early detection and immediate action, and why prophylactic protection of the bud in the wet season matters so much.
How do I protect my other palms once one has bud rot?
Treat the outbreak as a wet-season emergency. Clean and treat (or remove and burn) the affected palm to cut the spore source, then give prophylactic crown/spindle sprays of a copper-based fungicide (Bordeaux mixture) to the surrounding palms before and during the rains, repeating through prolonged wet spells. Keep drainage and crown hygiene good and the palms vigorous. Confirm the copper schedule with your KVK.
Symptoms and control measures follow ICAR, KVK and state agricultural-university package-of-practices; any named chemical is a registered use. Always read the product label and confirm the dose for your crop and zone. editorial policy.