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How to identify it
- The adult female is flat and 4 to 5 mm long, covered by a shiny, pale-green, almost see-through shield.[2]
- The body is nearly triangular: bluntly pointed at the front and broadly rounded at the back.[2]
- As she produces eggs, the female turns brown, opaque and a little more domed.[2]
- Crawlers are flat and light yellow. The scales sit on the upper or lower surfaces of leaves and also on the fruit.[2][1]
Look-alikes
Where it lives
Its native range is uncertain. It occurs widely in tropical and warmer subtropical regions around the world, and ScaleNet records it in the United States from Florida and Texas.[3][2]
Biology and life cycle
Females generally reproduce without mating, and males are rare.[2][3]
It has two to three generations a year; in Israel's coastal plain there are three.[3][2]
It feeds on plants in more than 86 genera, including mango, citrus, avocado, hibiscus and myrtle.[3]
Damage and signs
- It damages mango by sucking plant juices, and its honeydew grows sooty mold on the leaves, which cuts photosynthesis.[2]
- Heavy infestations reduce tree vigor and leaf size and cause yellowing, leaf drop and the death of branches.[2]
- Besides being a serious mango pest, it is an occasional pest of a range of ornamental plants.[3]
Health risk
The sources treat it only as a plant pest; none mentions bites or any risk to people or pets.[2][3][1]
Control
Prevention
Before spraying, check whether many of the scales are already dead or parasitized; if so, delay treatment and check again later.[4]
Biological control
Scales on mango are frequently parasitized by small wasps; one, Microterys nietneri, attacks soft scales.[1]
Ants that tend the scales for honeydew can reduce parasitism, so control them with sticky barriers on trunks or insecticide baits, and avoid persistent broad-spectrum insecticides that kill natural enemies.[2][4]
Pesticides
Where treatment is needed, a thorough spray of horticultural oil timed to when crawlers are active controls most scales.[4]
Common questions
- What are the flat green scales on my mango leaves?
- Mango shield scale is a likely suspect: a flat, shiny, pale-green, nearly triangular scale 4 to 5 mm long that turns brown as it lays eggs.[2]
- Does mango shield scale only attack mango?
- No. It feeds on plants in more than 86 genera, including citrus, avocado, hibiscus and myrtle.[3]
- Will mango shield scale kill my tree?
- Heavy infestations can reduce vigor, cause yellowing and leaf drop and kill branches.[2]
Sources
- University of Florida IFAS Extension (EDIS), “Mango Pests and Beneficial Insects (ENY-413/IG073, 2017).” journals.flvc.org/edis/article/view/138135 (accessed 2026-11-09)
- ScaleNet (scale insect database begun at the USDA ARS Systematic Entomology Laboratory), “ScaleNet catalogue: Milviscutulus mangiferae (Green).” scalenet.info/catalogue/Milviscutulus%20mangiferae/ (accessed 2026-11-09)
- European Food Safety Authority (EFSA Journal), “Pest categorisation of Milviscutulus mangiferae (EFSA Panel on Plant Health 2023, EFSA Journal 21: e07846; PubMed abstract).” doi.org/10.2903/j.efsa.2023.7846 (accessed 2026-11-09)
- University of California Statewide IPM Program, “Pest Notes: Scales (UC ANR Publication 7408).” ipm.ucanr.edu/home-and-landscape/scales/ (accessed 2026-11-09)
- iNaturalist, “Milviscutulus mangiferae taxon page (order and family).” www.inaturalist.org/taxa/507163 (accessed 2026-11-09)