common name: coconut mealybug
scientific name: Nipaecoccus nipae (Maskell) (Insecta: Hemiptera: Pseudococcidae)

Introduction - Distribution - Field Characteristics - Life Cycle - Hosts - General Plant Damage - Management - Selected References

Introduction

The coconut mealybug, Nipaecoccus nipae (Maskell), is also called the spiked mealybug, nipa mealybug, avocado mealybug, sugarapple mealybug or Kentia mealybug. The several names are due to the wide host range of this pest, but coconut mealybug is the most widely used common name. Coconut mealybug may be economically damaging to palms and tropical fruit crops.

Distribution

This mealybug is widely distributed. It has been found in North, Central and South America; Europe, Asia, Oceania and Africa (Miller et. al. 2007).

Field Characteristics

The adult female is generally the best life stage for identification. Final, confirmatory species-level identification of a mealybug is often based on slide-mounted morphological features associated with adult females.

adults and immatures

Adult females range between 0.059 and 0.98 inches (1.5 and 2.5 mm) long, are oval in shape and reddish-brown to orange in color, covered by a yellowish-orange thick wax and with 10 to 12 pairs of marginal pyramid-shaped wax filaments. The dorsal surface of the body contains five to eight waxy filaments similar to the ones present on the side or lateral areas of the body. No ovisac or egg-containing sac within the female is present.

adult with dorsal filaments

nymphs

Males are oblong and smaller than females. Males develop in very thin white cottony wax cocoons prior to emerging as adults (Hodges et.al. 2008, Miller et. al. 2007).

adult female and male

Life Cycle

Males and females cannot be readily distinguished from each other during the first two instars, but the third instar female begins to resemble the adult. When present, immature males change within a pupal cocoon during the third instar prior to emerging as a winged adult

life cycle

Hosts

This species attacks more than 40 families of host plants, including:

General Plant Damage

Adult females and immatures feed on the sap of the host plant. Honeydew secretions produced during feeding may result in black, sooty mold growth. The presence of sooty mold can result in reduced photosynthesis, defoliation, and occasional death of a young plant (Watson 2004). Ants are often found feeding on mealybug honeydew secretions and may also defend the mealybugs from predators or parasitoids (Ben-Dov 1994, Williams and Granara de Willink 1992).

infestation

infestation

infestation

Management

Management of scale and mealybug insects begins with detection and identification of the pest. Mealybugs can be very small or resemble disease organisms or even plant structures, making detection difficult. Regular monitoring will allow detection of these pests before damage is obvious and will also allow improved control. All plant parts need to be searched, including the undersides of leaves and stems. Inspection of plants prior to introducing them into the landscape, nursery or collection is very important in reducing new infestations of scales.

Management can be difficult because of the waxy material mealybugs produce which provides protection from many insecticides. Pruning or washing infested plant parts can be helpful in reducing populations, particularly in cases of small infestations. A brisk wash spray of water can also be helpful in removing mealybugs from plants and reducing the population. Mealybugs are commonly attacked by predators, parasites and diseases which can help manage populations, particularly for long term control. It is important to recognize the presence of beneficial insects and to take steps to conserve them in the environment so they are available to control the pest insects. The use of Pseudaphycus utilis Timberlake, a parasitic wasp, as a biological control agent successfully controlled coconut mealybug in Hawaii and Puerto Rico (Watson 2004).

It is often necessary to manage mealybugs with insecticides so it is important to select appropriate insecticides, timing and application methods to reduce negative impact on the natural enemies but still get maximum control.

Contact insecticides commonly provide quick knockdown of the pest but require good coverage and generally repeat applications. The stage most susceptible to contact insecticides is the crawler stage.

Horticultural oil and insecticidal soaps also can provide good control, but must be treated like contact insecticides, which require thorough coverage and repeat applications.

Systemic insecticides can provide excellent options for scale control and can provide some flexibility in application timing and methods. These insecticides move through the plant and provide an excellent way to expose scale insects to the insecticide when they feed on the plant.

It is important not to overuse or misuse insecticides which can lead to numerous problems including insecticide resistance. To avoid insecticide resistance it is critical to rotate among insecticide groups.

Florida Insect Management Guide for scale insects and mealybugs on ornamental plants
Florida Insect Management Guide for commercial foliage and woody ornamental arthropod pest management
Florida Citrus Pest Management Guide: soft-bodied insects attacking foliage and fruit

Selected References

Authors: Adriana Espinosa, Amanda Hodges, SPDN, University of Florida; Greg Hodges, Florida Department of Agriculture & Consumer Services, Division of Plant Industry; Catharine Mannion, University of Florida
Photographs: Lyle J. Buss, University of Florida; Raymond Gill, California Department of Food and Agriculture; Scot Nelson and Mike Nago, University of Hawaii at Manoa
Project Coordinator: Thomas R. Fasulo, University of Florida
Publication Number: EENY-448
Publication Date: May 2009
Copyright 2009 University of Florida

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Department of Entomology and Nematology
Division of Plant Industry
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