Common Mango Pests and Diseases: Identification and Management

Mango (Mangifera indica L.) is grown in over 120 countries, with global production exceeding 55 million tonnes annually. Despite its commercial importance, mango orchards face persistent threats from insect pests and fungal diseases that can sharply cut yields and downgrade fruit quality. About 400 species of insect pests are known to infest mango worldwide, while fungal diseases regularly devastate inflorescences and marketable fruit. Knowing how to identify the most damaging culprits – and when and how to act against them – is the foundation of productive mango farming.

Key insect pests of mango
Mango hopper
Mango mealy bug
Major fungal diseases of mango
Powdery mildew
Anthracnose
Management strategies
Cultural and orchard management practices
Biological control
Chemical control
Monitoring and record keeping

Key insect pests of mango

Several insect pests consistently rank as the most destructive threats to mango orchards. The two that cause the greatest economic damage across tropical and subtropical growing regions are the mango hopper and the mango mealy bug.

Mango hopper

Out of 18 known species of mango hopper, three – Amritodus atkinsoni, Idioscopus clypealis, and Idioscopus niveosparsus – are of global economic importance, attacking trees mainly during flowering and early fruiting. They are small, wedge-shaped insects; adults are golden or dark brown and measure 3.5-5 mm in length, while nymphs are pale yellow with red eyes.

Both nymphs and adults suck phloem sap from twigs, inflorescences, tender leaves, and young fruits. Infested flowers shrivel, turn brown, and drop before they can set fruit. As they feed, hoppers secrete a sticky honeydew that coats leaves and branches, creating ideal conditions for sooty mold – a secondary fungal growth that blocks sunlight and reduces photosynthesis, further stressing the tree. Crop losses from mango hoppers can reach up to 50% in severely infested orchards.

Hoppers thrive in warm, humid conditions (25-30°C, humidity above 70%) and multiply rapidly in neglected, densely planted, or shaded orchards. In north India, two distinct generations occur per year, with peak activity during the flowering season in February-March.

Mango mealy bug

The mango mealy bug (Drosicha mangiferae) is ranked second only to the mango hopper in terms of damage to mango orchards. Both nymphs and adult females suck sap from tender leaves, shoots, and inflorescences, causing the infested parts to dry up, affecting fruit set and leading to premature fruit drop. The insects are covered in a white, waxy powder that makes contact pesticides less effective.

Mealybug females lay eggs in the soil near tree trunks, where they remain dormant for six to seven months before nymphs hatch and begin climbing the tree. Like hoppers, mealy bugs produce honeydew that encourages sooty mold. Heavy infestations cause leaf yellowing, stunted growth, and significant fruit drop.

Major fungal diseases of mango

Fungal diseases cause some of the most widespread and economically significant damage in mango orchards. Powdery mildew and anthracnose are the two diseases growers encounter most frequently and must manage most aggressively.

Powdery mildew

Powdery mildew is caused by the fungus Oidium mangiferae and is one of the most damaging diseases at the flowering stage. Airborne spores land on susceptible tissues, germinate, and produce fungal mycelium that ramifies over the host surface, eventually killing host cells – the abundant fungal growth on the surface is what creates the characteristic “powdery” appearance.

The disease looks like white powder on leaves, flowers, and fruit, and it thrives in dry conditions combined with high humidity during early morning and evening hours. Severe infections cause premature dropping of flowers and small fruits and can distort young leaves. Powdery mildew caused by Oidium mangiferae is regarded as the most important mango disease, with crop losses ranging from 30 to 90% when left uncontrolled.

Anthracnose

Anthracnose, caused by the fungus Colletotrichum gloeosporioides, is the most common pre- and post-harvest disease of mango, causing economic losses of 30-60% in tropical and subtropical production systems. It affects leaves, twigs, inflorescences, and fruits at every growth stage.

The disease is capable of causing latent infections – the fungus can infect green fruit and remain dormant inside, emerging as the fruit reaches full ripeness as dark, sunken, grey-black patches on the skin. On leaves, it appears as irregular dark brown to black necrotic spots. Rain and wind are the main forces that spread fungal spores, and wet weather during flowering and fruit set dramatically amplifies disease severity and fruit drop.

Management strategies

Effective management of mango pests and diseases depends on combining cultural practices, biological controls, and targeted chemical applications under an Integrated Pest Management (IPM) framework. IPM emphasizes prevention, regular monitoring, and decision-making based on pest thresholds rather than calendar-based pesticide spraying.

Cultural and orchard management practices

Good orchard hygiene is the first line of defense. Pruning branches that cross or crowd the canopy improves airflow, reduces humidity, and lowers conditions favorable for fungal disease. Removing and destroying infected plant debris, fallen leaves, and fruit reduces the source of disease inoculum for both anthracnose and powdery mildew. For mealy bug, ploughing and periodic flooding of the orchard soil during October-November can destroy mealybug eggs before nymphs hatch and begin climbing the tree.

A proven mechanical barrier against mealy bugs is wrapping tree trunks with a 30 cm wide polythene band at about 30 cm above ground level and applying grease at the lower edge. This prevents nymphs from climbing to the canopy. For hoppers, maintaining wide spacing between trees, avoiding dense plantings, and choosing tolerant or resistant varieties – such as Totapuri and Mallika – can significantly reduce infestation pressure.

Biological control

Natural enemies play a useful role in suppressing pest populations without the side effects of pesticide overuse. Biological control agents for mango hoppers include the predators Mallada boninensis and Chrysopa lacciperda, and the egg parasite Polynema sp., all of which can help keep hopper populations below damaging levels. For mealy bugs, soil application of the entomopathogenic fungus Beauveria bassiana reduces nymph populations effectively. For fungal diseases, biofungicides containing beneficial microorganisms such as Bacillus subtilis or Trichoderma spp. can suppress fungal pathogens as part of an integrated disease management strategy.

Chemical control

When pest or disease pressure exceeds manageable levels, targeted chemical applications are necessary. Timing is critical – both for effectiveness and to minimize harm to pollinators and natural enemies.

For mango hopper: Imidacloprid has shown the highest efficacy in reducing hopper populations, achieving over 88% reduction overall, while also being moderately less toxic to natural enemies compared to older insecticides like endosulfan. Neem oil (azadirachtin-based) achieves 56-60% reduction while preserving natural enemy populations, making it suitable for eco-friendly or organic programs. A rational rotation of insecticides is recommended to prevent the development of field resistance.

For mango mealy bug: A combination of cultural and chemical methods is most effective. Integrating cultural, mechanical, and chemical methods achieved a 98.46% reduction in mealybug populations compared to individual approaches. Imidacloprid and chlorpyriphos are commonly used insecticides, while neem-based formulations serve as organic alternatives.

For powdery mildew: Fungicides are very effective if applied at the first sign of the disease, with chemical sprays typically needed only during flowering and fruit set stages. Sulfur-based fungicides and strobilurin fungicides (azoxystrobin, trifloxystrobin) are effective options.

For anthracnose: Copper fungicides should be sprayed regularly from when flowers begin to form in order to limit the prevalence of infection in developing fruit. Systemic fungicides containing propiconazole or tebuconazole provide better tissue penetration and longer-lasting protection for severe or persistent infections.

Monitoring and record keeping

Early detection is the cornerstone of any successful management program. Orchards should be inspected at least twice a week during the flowering and fruiting seasons – the periods of highest risk. Pay close attention to new growth, flower panicles, and developing fruits. Maintaining permanent records of pest and disease occurrences, weather conditions, and treatment applications provides essential data for making better management decisions in subsequent seasons – and is increasingly required for export certification and food safety standards.

The fundamental principle of IPM is to use economic thresholds to guide decisions, deploying a mix of biological, physical, and chemical controls rather than defaulting to scheduled pesticide sprays. This approach protects orchard biodiversity, reduces the risk of pesticide resistance, and keeps chemical residues in fruit within safe limits.

What do you think? Given that over-reliance on chemical insecticides can harm natural enemies and trigger pest resurgence, how feasible is it for smallholder mango farmers to transition to IPM-based management in their specific growing conditions? And with latent anthracnose infections capable of lying dormant in green fruit and activating only at ripening, how should post-harvest protocols be adjusted to minimize marketable fruit losses?

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Table of Contents

Key insect pests of mango 🔗

Mango hopper 🔗

Mango mealy bug 🔗

Major fungal diseases of mango 🔗

Powdery mildew 🔗

Anthracnose 🔗

Management strategies 🔗

Cultural and orchard management practices 🔗

Biological control 🔗

Chemical control 🔗

Monitoring and record keeping 🔗