Cassava Mealybugs : Identification, Damage, and Control Methods

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Introduction to Cassava Mealybugs

Cassava mealybugs are serious agricultural pests that attack cassava plants and reduce yield significantly. They are small, soft-bodied insects covered with white waxy powder and they usually cluster on cassava stems, leaves, and growing points. Cassava mealybugs are one of the most destructive pests of cassava in Africa.

The most common species is Phenacoccus manihoti, which caused major cassava crop losses in Africa in the past before biological control methods were introduced.

What Are Cassava Mealybugs?

Cassava mealybugs are sap-sucking insects that belong to the insect family Pseudococcidae. They feed on cassava plants by piercing plant tissues and sucking plant sap, which weakens the plant and reduces growth. see also piercing and sucking insect pest

Scientific Classification

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Class: Insecta
  • Order: Hemiptera
  • Family: Pseudococcidae
  • Scientific name: Phenacoccus manihoti

60. DISEASES AND PESTS OF CROPS
61. MAIZE SMUT
62. RICE BLAST economic
63. MAIZE RUST
64. LEAF SPOT OF GROUNDNUT
65. COW-PEA MOSAIC
66. COCOA BLACK POD DISEASE

Identification of Cassava Mealybugs

Farmers can identify cassava mealybug infestation using the following signs:

  • White cotton-like substances on cassava stems and leaves
  • Leaves become yellow and curl
  • Stunted plant growth
  • Shortened internodes
  • Distorted shoots
  • Presence of ants around cassava plants
  • Sticky honeydew on leaves
  • Sooty mold growing on leaves

Damage Caused by Cassava Mealybugs

Cassava mealybugs damage cassava plants in several ways:

1. Sap Loss

They suck plant sap which reduces nutrients available for plant growth.

2. Leaf Curling

Leaves curl and deform, reducing photosynthesis.

3. Stunted Growth

The plant becomes small and weak.

4. Reduced Yield

Root tubers become small, leading to low cassava production.

5. Sooty Mold Growth

They produce honeydew which encourages black sooty mold fungus.

Life Cycle of Cassava Mealybugs

The cassava mealybug life cycle includes:

  1. Egg stage
  2. Nymph stage
  3. Adult stage

Female mealybugs lay eggs in cotton-like sacs. The eggs hatch into nymphs which begin feeding immediately. The life cycle takes about 3–4 weeks depending on temperature.

Control of Cassava Mealybugs

1. Biological Control

This is the most effective method. A parasitic wasp called Anagyrus lopezi is used to control cassava mealybugs. The wasp lays eggs inside the mealybug and kills it.

2. Cultural Control

  • Use healthy cassava cuttings
  • Destroy infected plants
  • Control ants around cassava farms
  • Practice crop rotation
  • Plant resistant cassava varieties

3. Chemical Control

Insecticides can be used but are not always recommended because mealybugs are protected by wax coating.

Examples include:

  • Dimethoate
  • Malathion
  • Imidacloprid

Prevention of Cassava Mealybug Infestation

Farmers can prevent infestation by:

  • Planting clean cassava stems
  • Regular farm inspection
  • Early removal of infected plants
  • Encouraging natural predators
  • Avoid planting infected cuttings

Economic Importance of Cassava Mealybugs

Cassava mealybugs can cause yield losses of up to 80% if not controlled. This can lead to food shortage and economic loss for farmers, especially in cassava-producing countries.

Conclusion

Cassava mealybugs are dangerous pests that attack cassava plants by sucking sap and weakening the plant. They cause leaf curling, stunted growth, and reduced yield. The best control method is biological control using parasitic wasps, along with cultural practices such as using clean planting materials and removing infected plants. Proper management of cassava mealybugs helps farmers maintain high cassava yield and protect their farms.

FAQ About Cassava Mealybugs

1. What are cassava mealybugs?

Cassava mealybugs are sap-sucking insect pests that attack cassava plants.

2. What is the scientific name of cassava mealybug?

The scientific name is Phenacoccus manihoti.

3. How do cassava mealybugs damage cassava?

They suck plant sap, causing leaf curling, stunted growth, and yield reduction.

4. What is the best control method?

Biological control using parasitic wasps is the best method.

5. How can farmers prevent cassava mealybugs?

By using clean cassava cuttings and removing infected plants early.

6. Do cassava mealybugs affect cassava roots?

They mainly affect leaves and stems but reduce root yield indirectly.

7. Are cassava mealybugs common in Africa?

Yes, they are very common in cassava-growing regions in Africa.

8. What attracts cassava mealybugs?

Poor farm sanitation, infected cuttings, and presence of ants.

9. Can insecticides kill cassava mealybugs?

Yes, but they are not very effective due to the wax coating.

10. What is the main symptom of cassava mealybug infestation?

White cotton-like substances on cassava stems and leaves.

Glossary

  • Mealybug: A small sap-sucking insect covered with white wax.
  • Honeydew: Sticky liquid excreted by sap-sucking insects.
  • Sooty mold: Black fungus that grows on honeydew.
  • Biological control: Use of natural enemies to control pests.
  • Parasitic wasp: A wasp that lays eggs inside another insect.

Cassava mealybugs, Phenacoccus manihoti, cassava pests, cassava pest control, cassava diseases and pests, cassava insect pests, cassava farming problems, cassava yield loss, biological control cassava pests, cassava farm management.

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Originally posted 2022-02-13 16:29:52.

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