Palm Oil at a Crossroads: The Rising Threat of Ganoderma in Southeast Asia

According to REUTERS

Introduction: A Fungal Threat Beneath the Soil

Beneath the sprawling, humid plantations of Southeast Asia, a quiet but devastating crisis is taking root—literally. Ganoderma boninense, a soil-borne fungus responsible for basal stem rot (BSR) in oil palm trees, is now appearing earlier than ever in the planting cycle. Once a disease mostly afflicting mature trees near the end of their productive lifespan, Ganoderma is now striking younger plantations during their second planting cycle, long before they reach peak yield.

This shift in disease pattern has sent ripples through the palm oil industry, particularly in Malaysia and Indonesia, which together produce over 80% of the world’s supply. While headlines often focus on labor shortages, price fluctuations, and environmental deforestation, Ganoderma is emerging as a slower, more insidious threat—one that may reshape the industry’s future if left unchecked.

Section 1: Early Arrival, Heavy Losses

The traditional understanding of Ganoderma’s lifecycle suggested that the disease would emerge only after three generations of planting on the same land. But in recent years, researchers and plantation managers have noticed a troubling trend: the disease is now appearing during second-cycle plantings, and in some cases, even earlier. The Malaysian Palm Oil Board (MPOB) recently conducted a large-scale survey over 1.46 million hectares of plantations and found that nearly 13.7%—approximately 199,644 hectares—showed signs of Ganoderma infection.

In terms of economic output, the impact is severe. According to plant pathologists, a 1% increase in Ganoderma infection can reduce yield by 0.5% to 0.8% per hectare. When scaled over a 25-year planting cycle, this results in a 15–20% drop in overall productivity. In high-infection zones, yields can drop by as much as 60%, depending on tree density and infection severity.

Section 2: No Cure, No Warning

The most alarming aspect of Ganoderma is the lack of a cure. Once an oil palm is infected, it enters a state of irreversible decline. The infected tree begins to rot from the base of the stem upward, eventually collapsing under its own weight. By the time symptoms become visible—such as yellowing leaves or wilting fronds—the fungus has already entrenched itself deeply within the plant’s structure.

Detection technologies are limited, particularly for smallholders who lack access to modern diagnostic tools. A promising recent development is the use of recombinase polymerase amplification-lateral flow assay (RPA-LFA) methods, which can detect Ganoderma DNA in asymptomatic trees. However, such techniques remain costly and logistically challenging to scale, especially in remote or under-resourced regions.

Section 3: The Zero-Burning Dilemma

Historically, one of the most effective ways to combat Ganoderma was controlled burning of infected plant material. This practice helped to destroy fungal spores in the soil before replanting. But in recent years, zero-burning regulations—enacted to prevent cross-border haze and air pollution—have prohibited this approach.

These policies, while environmentally driven and well-intentioned, have created a paradox. Without the option to sterilize soil through burning, infected wood and stumps remain in the field, providing a haven for Ganoderma to spread to newly planted palms. Thus, efforts to protect the environment from haze may inadvertently be accelerating the spread of a deadly plant pathogen.

Section 4: Smallholders on the Edge

In Malaysia, approximately 40% of oil palm plantations are operated by smallholders—farmers who often manage under 100 hectares of land. These growers are especially vulnerable to Ganoderma’s impact. Unlike large agribusinesses, they lack the capital for disease monitoring, early intervention, or replanting efforts.

One smallholder in Selangor reported that two acres of his 50-acre plantation had become infected. With no government compensation available and little access to scientific advice, he was forced to let the trees die slowly, unable to afford immediate removal and replacement. This situation is common, especially in states like Johor, Sabah, Sarawak, Perak, and Negeri Sembilan, where the infection rate is highest.

Section 5: The Industry’s Quiet Alarm

Despite the scale of the issue, major players have largely refrained from sounding loud public alarms. Companies like Kuala Lumpur Kepong Berhad, with nearly 300,000 hectares under cultivation, acknowledge the presence of Ganoderma but are tight-lipped about its operational impact. Others, like FGV Holdings, reported a 1% infection rate but downplayed its effect on productivity.

Some industry veterans, like M.R. Chandran, a former advisor to the Roundtable on Sustainable Palm Oil (RSPO), argue that Ganoderma is the second-biggest challenge facing the industry—behind only labor shortages. Still, many investors and policymakers seem unaware of the full scale of the problem.

Section 6: Scientific Complexity and Mycology

Ganoderma is not a single species but a genus of fungi with multiple pathogenic strains affecting oil palms. The most dangerous in Southeast Asia is G. boninense, though other species like G. zonatum and G. miniatocinctum are also present. These fungi are classified as basidiomycetes, a group of fungi known for their wood-decaying properties.

The complexity of their lifecycle—spore dispersal, soil survival, infection through root wounds—makes them difficult to eradicate. Scientists are investigating biological controls, such as Trichoderma spp. and endophytic bacteria, but results remain inconsistent. Genetic research into disease-resistant oil palm hybrids offers promise, but commercial availability is years away.

Section 7: A Threat to Global Supply Chains

Palm oil is a foundational ingredient in global supply chains. From cooking oils to shampoos, detergents to baked goods, it touches billions of lives daily. As Ganoderma continues to erode yields in key producing countries, ripple effects are inevitable: price volatility, supply shortages, and increased pressure on alternative oil crops like soybean, rapeseed, and sunflower.

Moreover, the situation could disrupt progress on sustainability goals. With pressure mounting to avoid expanding into forested land, replanting on existing plantations is vital. But if those plantations are riddled with Ganoderma and replanting fails, producers may be tempted to clear new land—potentially reversing years of environmental progress.

Section 8: A Tipping Point—and a Choice

We are now at a tipping point. The fungus does not spread overnight, but it spreads with certainty. Every year without decisive action means more infected trees, more lost income, and more pressure on an already fragile industry.

Addressing the Ganoderma crisis requires:

• Policy Reform: A nuanced approach to zero-burning that balances environmental protection with disease management.
• Scientific Investment: Funding for early detection tools and resistant palm varieties.
• Smallholder Support: Subsidies, training, and technical resources to help rural farmers respond effectively.
• Transparency: Industry-wide cooperation and data sharing to map and respond to infection patterns.
• Public Awareness: Education campaigns to inform consumers and stakeholders about the challenges behind the palm oil they use every day.

Conclusion: Digging Deeper

Ganoderma boninense is not just a fungus. It is a mirror reflecting the vulnerabilities of modern agriculture—its overreliance on monocultures, its regulatory blind spots, and its unequal resource distribution.

If left unaddressed, this crisis could reshape not only the economics of palm oil but also the geopolitical stability of regions dependent on its export. Yet within this challenge lies an opportunity: to act early, to think holistically, and to build resilience from the ground up.

The future of palm oil—and of the communities who grow it—may very well depend on how deeply we’re willing to dig into the soil and confront what’s growing beneath.

References

Malaysian Palm Oil Board (MPOB). 2023. Ganoderma survey findings.

RSPO Smallholder Programme.

According to REUTERS

Frequently Asked Questions

What is Ganoderma basal stem rot and why is it so dangerous?

Ganoderma basal stem rot (BSR) is caused primarily by Ganoderma boninense (and related Ganoderma species in some regions) and is the most economically important disease of oil palm (Elaeis guineensis) globally, with particularly severe impact in Malaysia and Indonesia—which together produce approximately 85% of the world’s palm oil. The disease mechanism: Ganoderma infects oil palm through the roots and lower stem (bole); once established, it causes white rot decay of the vascular tissue and structural wood of the lower palm, progressively destroying the palm’s ability to transport water and nutrients while structurally weakening the trunk. Infected palms show symptoms of nutrient deficiency and water stress (yellowing and wilting fronds) followed by bole rot, crown wilt, and death; the progression from first visible symptoms to palm death takes 1–4 years. Economic significance: in severely affected estates in Malaysia, BSR affects 30–80% of palms in advanced rounds of cultivation (third or later planting cycle); dead palm replacement represents enormous lost revenue; a palm killed at 10 years old has lost approximately two-thirds of its productive life. The disease worsens with each replanting cycle because infected root material from previous crops serves as inoculum for new plantings.

How does Ganoderma spread between oil palm trees?

Ganoderma spread in oil palm plantations occurs through two primary pathways: root contact spread and spore-based spread. Root contact spread is the more important pathway: Ganoderma mycelium grows through the soil along dead and living roots; when the mycelium of an infected root contacts a healthy root of an adjacent palm, it penetrates the healthy root and initiates a new infection; this creates the characteristic ‘foci’ or clusters of diseased palms in plantation settings, where BSR spreads progressively from a single infected palm to all surrounding palms in a radial pattern over years. Spore-based spread: Ganoderma produces large conk-like fruiting bodies (basidiocarps) on the base of infected palms; these release millions of white basidiospores that are dispersed by air and by insects; spores infect through wounds (including pruning cuts) and possibly through intact fine roots; spore spread is responsible for new infection foci forming in previously uninfected areas. Replanting hazard: the old root systems of infected palms persist in the soil for years after replanting; intact Ganoderma mycelium in these old roots remains viable and infects roots of newly planted palms; the severity of BSR consistently increases with each successive planting cycle on the same land because inoculum accumulates.

Is there any treatment for Ganoderma infection in oil palm?

Despite decades of research, no reliably curative treatment for established Ganoderma BSR infection in oil palm exists; management focuses on early detection, prevention, and containment rather than cure. Attempted curative treatments: fungicide injections (hexaconazole, fosetyl-Al, and other systemic fungicides have been injected into infected palms); results have been inconsistent—some studies show slowed disease progression; none have achieved reliable elimination of established infection. Surgical removal: physical removal of infected and decayed bole tissue (exposed through surgical trenching) followed by wound treatment with fungicide paste; this approach can temporarily slow progression but does not eliminate the root-system infection. Trunk injection of chemical agents: various approaches including phosphite, hexaconazole, and novel compounds have been trialled. Biocontrol agents: Trichoderma species applied to root zones before or at replanting has shown variable efficacy in field trials; Pseudomonas fluorescens and Bacillus species have also been investigated. Current state: the most effective strategy is prevention—using clean planting material, destroying infected stumps before replanting, applying biological control agents preventively, and maintaining palm health to maximise natural resistance; treatment of established infection is palliative rather than curative.

How is Ganoderma infection detected early in plantations?

Early detection of Ganoderma infection—before visible symptoms appear—is a major research priority because intervention before bole rot is established offers the best management opportunity. Symptom-based detection limitations: by the time yellowing fronds and other visible symptoms appear, the palm has typically had an established infection for 1–3 years; significant bole rot may already be present; this is why symptom-based scouting detects disease at a stage when management options are most limited. Molecular diagnostics: quantitative PCR (qPCR) and LAMP (Loop-mediated Isothermal Amplification) assays for Ganoderma DNA in root samples, soil samples, and even in palm vascular sap are under development; early-stage research shows these methods can detect Ganoderma before visible symptoms; soil assays can map the distribution of Ganoderma inoculum in plantation soil before replanting, potentially guiding preventive treatment. Remote sensing: thermal infrared imaging can detect thermal signatures of water stress in palms before visible symptoms; multispectral and hyperspectral satellite imagery can detect canopy reflectance changes before overt yellowing; UAV (drone) surveillance platforms enable high-resolution canopy monitoring at estate scale. Portable diagnostic devices: handheld PCR devices and lateral flow assay formats for Ganoderma antigens are being developed for estate-level use without laboratory infrastructure.

What are the sustainable alternatives to palm oil if Ganoderma devastates production?

Palm oil is extraordinarily productive—per hectare, oil palm yields 4–10 times more oil than competing oilseed crops (soybean, rapeseed, sunflower)—meaning that substituting palm oil with alternative oils while meeting global vegetable oil demand would require vastly more agricultural land. This makes the Ganoderma threat not merely an industry problem but a global food and sustainability concern. Alternative oilseeds: soybean oil—the closest in global production scale; yields approximately 0.4–0.5 tonnes of oil per hectare versus 3–5 tonnes for palm; replacing all palm oil with soybean would require approximately 6–10× more agricultural land. Rapeseed/canola—0.8–1.2 tonnes oil per hectare; similarly land-intensive as a substitute. Sunflower—0.6–0.8 tonnes oil per hectare. Novel alternatives under research: high-oleic algae oil production in closed photobioreactors—potentially high per-hectare equivalent yield without agricultural land use; yeast-based single-cell oil production from agricultural waste substrates; Cuphea and other high-lauric acid oilseed crops that partially substitute for palm’s lauric oil fraction. Biotechnological solutions to Ganoderma: breeding BSR-resistant or tolerant oil palm varieties is an active research priority; some wild Elaeis species show reduced susceptibility to Ganoderma and are being used in breeding programmes; the long generation time of oil palm (5+ years to first fruit) makes conventional breeding slow. Industry response: the oil palm industry is investing heavily in Ganoderma research (MPOB, Sime Darby, IOI Corporation) because the alternative—major production losses without cure—is existentially threatening.