Mealybug Pest Control

Combatting the Menace

Understanding Mealybugs


Mealybugs are sap-sucking pests that can cause significant crop losses across a wide array of crops worldwide. Particularly harmful to high-value export crops such as citrus fruits and table grapes, mealybugs damage crops by producing honeydew—a sweet, sticky secretion that encourages the growth of sooty moulds.

These moulds reduce the plant's photosynthetic potential and cause cosmetic damage to fruits through discolouration. Fruits affected by sooty moulds often become unsuitable for export if the mould cannot be washed off at the packhouse. Additionally, some mealybug species secrete toxic substances that result in growth deformities, such as raised shoulders on citrus fruit.

In grapes, heavy mealybug infestations can cause bunches to wither and leaves to fall off before harvest, leading to direct harvest losses. Furthermore, mealybug damage decreases the growth potential of the plant, reducing the longevity of the vines.



Impact on Different Farming Industries

Citrus Farming

Mealybugs extract sap from citrus trees, weakening them and causing leaf yellowing and premature fruit drop.

The honeydew they excrete leads to sooty mould growth, which can cover leaves and fruits, affecting photosynthesis and fruit quality.

Moreover, mealybugs can transmit plant viruses, posing an additional threat to crop health.

Vineyard Farming

In vineyards, mealybugs feed on grapevines, reducing vine vigour and causing chlorosis and stunted growth.

The infestation affects grape quality due to sooty mould and honeydew, impacting taste and appearance.

They are also known vectors of grapevine leafroll-associated viruses, which severely affect grapevine health and productivity.

Macadamia Nut Farming

Mealybugs feed on the sap of macadamia trees, leading to nutrient loss, reduced growth, and weakened trees.

The honeydew promotes sooty mould growth, which reduces photosynthesis and impacts nut production. Infested nuts can be deformed and less marketable, leading to economic losses.

Livestock Farming

While mealybugs do not directly affect livestock, they can infest fodder crops like alfalfa, reducing their nutritional quality and availability.

Infestation in pastures can lead to reduced plant vigour, affecting the quality and quantity of feed available for livestock.

Effective Biological Control

The cryptic nature of mealybugs, dense tree canopies, and restrictions on certain pesticides make controlling mealybug infestations practically impossible with conventional chemical sprays alone. Fortunately, there is a diverse range of natural enemies for different mealybug species. These biological control agents swiftly bring pest populations under economic control once established within an orchard or vineyard.

Enhancing the population of biological control agents through augmentative releases and effectively managing ants creates an environment conducive to effective Integrated Pest Management (IPM) of mealybug pests.

This sustainable approach leaves no chemical residues and often yields a favourable cost-benefit ratio. Vital Bugs supplies the following biological control agents for mealybug management:

Predatory Beetles

  1. Cryptolaemus montrouzieri
  2. Nephus kamburovi

Combat the Mealybug Pest

Leverage bio control agents for sustainable farming


By leveraging these biological control agents, farmers can sustainably and effectively manage mealybug infestations, protecting their crops and ensuring long-term agricultural success.