Metarhizium Anisopliae for White Grub Control: Complete Guide for Farmers

White grubs are one of the most destructive soil pests, damaging roots and causing severe crop losses in sugarcane, groundnut, vegetables, and fruit crops. A highly effective and eco-friendly solution is Metarhizium anisopliae, a biological control agent that naturally infects and kills soil-dwelling insects.

🌱 What is Metarhizium anisopliae?

Metarhizium anisopliae is a green-spore entomopathogenic fungus found in soil. It infects insects like white grubs and kills them by penetrating their body and multiplying inside.

It is widely used as a biopesticide in organic and sustainable agriculture.

🐛 What Are White Grubs?

White grubs are the larval stage of beetles (commonly Holotrichia species) that feed on plant roots.

Damage symptoms:

  • Wilting of plants
  • Yellowing leaves
  • Root damage
  • Poor crop growth
  • Patchy field appearance

🔬 How Metarhizium Anisopliae Works

Step-by-Step Mode of Action:

  1. Spore Contact
    Fungal spores come in contact with the grub’s body
  2. Penetration
    Spores germinate and penetrate the insect cuticle
  3. Internal Growth
    Fungus multiplies inside the insect body
  4. Toxin Production
    Produces toxins that kill the grub
  5. Death & Spread
    Dead grub turns green due to fungal growth, spreading infection

👉 Death occurs within 4–10 days

🎯 Target Pests

Metarhizium anisopliae controls:

  • White grubs
  • Termites
  • Root grubs
  • Soil beetle larvae

🌾 Crops Affected by White Grubs

  • Sugarcane
  • Groundnut
  • Maize
  • Vegetables
  • Fruit crops (pomegranate, mango)

🌿 Benefits of Metarhizium Anisopliae

  • Eco-friendly and safe
  • Controls soil pests effectively
  • Long-lasting action in soil
  • Reduces chemical pesticide use
  • Improves soil biological activity
  • No resistance development

⚙️ Application Methods

1. Soil Application (Best Method)

  • Mix with compost or FYM
  • Broadcast in field before irrigation

2. Root Zone Application

  • Apply near plant roots

3. Drip Irrigation

  • Use liquid formulation through drip

📊 Dosage (General Guide)

  • Powder: 2–5 kg per acre
  • Liquid: 1–2 liters per acre

👉 Mix with 50–100 kg compost for better results

⏱️ Best Time to Apply

  • At the start of infestation
  • During soil moisture conditions
  • Early crop stage

⚠️ Best Conditions for Effectiveness

  • Moist soil
  • Temperature: 20–30°C
  • Avoid direct sunlight
  • High organic matter improves results

🚫 Common Mistakes to Avoid

  • Applying in dry soil
  • Mixing with chemical pesticides
  • Using low-quality products
  • Incorrect dosage

🔄 Compatible with Other Bio Inputs

Works well with:

  • Beauveria bassiana
  • Trichoderma

👉 Integrated Pest Management (IPM)

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