Mango malformation
Bunched rosette shoots (vegetative) or compact, over-branched, greenish flower panicles that set little fruit (floral) — a Fusarium-linked mango disorder.
- Pathogen
- Fungus (Fusarium mangiferae)
- Spreads by
- Infected scions/planting material
- Favoured by
- Infected material; susceptible varieties
- Main risk
- Deformed panicles set little/no fruit
Overview
Mango malformation is an important and long-recognised disorder of mango, linked to the fungus Fusarium mangiferae (with a possible role of mites and hormonal imbalance). It comes in two forms. Vegetative malformation, seen mostly on young plants and nursery stock, produces a bunched rosette of short, swollen, stunted shoots with small, narrow leaves crowded at the tip. Floral malformation, the more economically damaging form, turns the flower panicle into a compact, highly-branched, thickened, greenish head with many small, mostly sterile flowers.
The malformed floral panicles set little or no fruit and remain on the tree, so a heavily affected tree flowers profusely but yields very poorly. The disorder is spread mainly through infected planting material (scions/grafts) and is more of a chronic, tree-level problem than a fast epidemic. Because there is no simple cure, management centres on using clean, disease-free planting material, pruning out and destroying malformed shoots and panicles well below the affected part, and keeping trees healthy.
How to identify it
- Vegetative: a bunched rosette of short, swollen, stunted shoots with small, narrow leaves crowded at the tip (often on young/nursery plants).
- Floral: compact, highly-branched, thickened, greenish flower panicles with many small, mostly sterile flowers.
- Malformed panicles that set little or no fruit and persist on the tree.
- A tree that flowers profusely but yields very poorly where floral malformation is heavy.
What causes it and when
- Linked to the fungus Fusarium mangiferae, with a possible contributory role of mites and hormonal imbalance.
- Spread mainly through infected planting material — scions and grafts taken from affected trees.
- More of a chronic, tree-level disorder than a fast-spreading epidemic.
- Worse on susceptible varieties and where infected planting material was used.
Cultural & organic control
- Propagate only from healthy, malformation-free mother trees, and plant clean, disease-free nursery stock.
- Prune out and destroy malformed shoots and panicles well below the affected part, as they appear.
- Remove malformed panicles early so the tree does not waste resources on them.
- Keep trees healthy and vigorous, and manage mites where they contribute.
Chemical control
- There is no simple curative spray for malformation — management is mainly clean material, pruning and sanitation.
- Where recommended, deblossoming/pruning combined with recommended sprays (and mite management) can reduce it.
- Focus on clean planting material and removing malformed tissue rather than chasing a chemical cure.
- Confirm the current management package and variety advice for your area with your local KVK.
Prevent it coming back
- Propagate only from healthy mother trees and plant clean, disease-free nursery stock.
- Keep pruning out and destroying malformed shoots and panicles each season, well below the affected part.
- Keep trees vigorous, manage mites, and avoid taking scions from affected trees.
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
My mango flowers into compact green over-branched heads that set no fruit. What is it?
A compact, highly-branched, thickened, greenish flower panicle with many small, mostly sterile flowers that sets little or no fruit is floral mango malformation, linked to the fungus Fusarium mangiferae. Bunched rosettes of stunted shoots are the vegetative form. There is no simple cure — prune out and destroy malformed shoots and panicles well below the affected part as they appear, propagate only from healthy trees, and keep the tree vigorous.
Why does a malformation-affected tree flower a lot but yield little?
Because floral malformation turns the flower panicles into compact, over-branched heads full of small, mostly sterile flowers that cannot set fruit, even though the tree looks like it is flowering heavily. The tree pours resources into these malformed panicles, which persist without fruiting, so profuse flowering translates into very poor yield. Removing the malformed panicles early and using clean planting material are the main ways to protect what productive flowering remains.
How does mango malformation spread to new trees?
Mainly through infected planting material — scions and grafts taken from affected mother trees carry the disorder into the new plants, which is why it often shows up as vegetative malformation in nursery stock. It is more a chronic, propagation-borne problem than a fast airborne epidemic. So the key preventive step is to propagate only from healthy, malformation-free mother trees and plant clean, disease-free nursery stock, alongside pruning out malformed tissue on existing trees.
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.