Plutellidae

Guenée, 1845

diamondback moths

Genus Guides

is a of small to medium-sized commonly known as , named after the economically significant pest . The family contains approximately 26 described species in the Plutella, with additional genera including Eidophasia, Rhigognostis, and Homadaula. Members are characterized by elongated wings with long fringes, often appearing sickle-shaped, and generally drab coloration with banding or markings. The family has undergone taxonomic revision, with Praydinae and Scythropiinae elevated to family status or transferred to other families.

Plutella porrectella by (c) brendanboyd, some rights reserved (CC BY). Used under a CC-BY license.

Plutella armoraciae by (c)
Landry J-F, Hebert PDN, some rights reserved (CC BY). Used under a CC-BY license.

Rhigognostis interrupta by (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda. Used under a CC-BY license.

Pronunciation

How to pronounce Plutellidae: //pluˈtɛlɪdi//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from similar microlepidopteran by the combination of elongated wings with long fringes creating a sickle-shaped forewing appearance, smooth , and often thickened medially. Distinguished from Yponomeutidae (with which some authors have merged them) by wing venation and genitalia structure; from Praydidae and Scythropiidae by family-level characters established through molecular and morphological studies. -level identification often requires examination of genitalia, particularly for cryptic species such as versus P. australiana, which are externally similar but differ in internal reproductive anatomy.

Images

Appearance

Small to medium-sized with wingspans ranging from 7 to 55 mm. bears smooth . often thickened in the middle. Wings elongated with hindwings bearing long fringes; forewings often appear sickle-shaped due to fringe arrangement. Coloration generally drab with various banding and markings. Forward-projecting, often banded antennae visible in some .

Habitat

Diverse including agricultural fields, natural vegetation, and urban environments. Many associated with Brassicaceae plants. Some species inhabit arid highland regions (e.g., Plutella copaquillaensis in Andean deserts), -alpine zones (Rhigognostis species), or specific forest types. often attracted to lights at night.

Distribution

Worldwide distribution. is , found on all continents except Antarctica. Plutella australiana is restricted to Australia. Rhigognostis senilella occurs in Greenland and Iceland; R. marmorosella in European mountains. Eidophasia syenitella has Holarctic distribution. Plutella copaquillaensis is to northern Chilean Andes.

Seasonality

are mostly or . Activity patterns vary by and latitude. In temperate regions, multiple per year are common for multivoltine species. studies in South Africa indicate year-round activity with reduced winter .

Diet

Larvae are herbivorous, feeding on leaf surfaces and skeletonizing leaves. Many specialize on Brassicaceae. feeds on cruciferous crops including cabbage, broccoli, cauliflower, and canola. Eidophasia syenitella is associated with Arabis (rockcress). Plutella copaquillaensis larvae feed on Neuontobotrys lanata (Brassicaceae).

Host Associations

Brassicaceae - larval food plant primary for many
Brassica oleracea var. capitata (white cabbage) - larval food plantmajor for
Brassica oleracea var. botrytis (cauliflower) - larval food plantpreferred for P. xylostella development
Brassica oleracea var. italica (broccoli) - larval food plant for P. xylostella
Arabis (rockcress) - larval food plantexclusive for Eidophasia syenitella
Neuontobotrys lanata - larval food plant for Plutella copaquillaensis
Mimosa - larval food plant for Homadaula anisocentra (mimosa webworm)

Life Cycle

Complete with , larval, pupal, and stages. has four larval instars based on molting and capsule diameter measurements. Eggs laid individually or in small groups on leaves. Development time varies by host plant and temperature: 23-26 days from egg to adult under laboratory conditions (20°C). times range from 25-30 days depending on host. occurs in loose silk webs on host plants.

Behavior

are primarily or and attracted to light. Larvae feed externally on leaf surfaces, skeletonizing leaves by consuming tissue between . Some larvae construct loose silk webs on plants while feeding. Homadaula anisocentra (mimosa webworm) exhibits web-building . has demonstrated remarkable capacity to evolve and agents.

Ecological Role

Herbivores that can significantly impact plant , particularly agricultural crops. serves as for diverse including in Braconidae, Ichneumonidae, Tachinidae, Eulophidae, Chalcididae, Ceraphronidae, Pteromalidae, and Eurytomidae. Some species may function as bioindicators for health.

Human Relevance

is a major agricultural pest causing global control costs exceeding $1 billion and up to $5 billion in total economic impact. It affects cruciferous vegetable and oilseed production worldwide. Resistance to conventional has driven development of alternative control methods including sterile insect technique variants using self-limiting genes (Oxitec technology). Other have minimal economic impact. serves as subject for studies and taxonomic research on cryptic species.

Similar Taxa

PraydidaeFormerly classified as Praydinae within ; elevated to status based on morphological and molecular evidence
ScythropiidaeFormerly classified as Scythropiinae within ; variously transferred to Yponomeutidae or elevated to status
Yponomeutidae (ermine moths)Some authors consider a of Yponomeutidae; share Yponomeutoidea superfamily and similar larval feeding habits but differ in wing venation and genitalia
AcrolepiidaeSometimes included in by some authorities; differs in genitalia and wing characters
GelechiidaeSimilar small size and microlepidopteran habitus; distinguished by wing shape, fringe structure, and genitalia
YpsolophidaeClosely related with similar ; taxonomic boundaries disputed with some authorities merging or separating these families

More Details

Taxonomic instability

The 's classification has been unstable, with historical treatments recognizing three (Plutellinae, Praydinae, Scythropiinae) that have since been elevated to family rank or transferred elsewhere. Some authorities continue to merge with Yponomeutidae or Ypsolophidae.

Cryptic species diversity

studies have revealed unexpected cryptic diversity, including the discovery of Plutella australiana in Australia, which occurs sympatrically with P. xylostella but was previously unrecognized due to external morphological similarity.

Insecticide resistance

has evolved resistance to every major class of used against it, making it a model system for studying resistance evolution and .