Delphacidae

Leach, 1815

Delphacid Planthoppers, Planthoppers

Subfamily Guides

is a large of planthoppers in the order Hemiptera, comprising approximately 2000 distributed worldwide. Members are distinguished from other "hoppers" by a prominent spur on the tibia of the hindleg—a diagnostic morphological feature unique to this family. All species are phytophagous, with many species occurring on grasses and several serving as significant agricultural pests and of cereal . Notable pest species include the rice (Nilaparvata lugens), the white-backed planthopper (Sogatella furcifera), and the sugarcane planthopper (Perkinsiella saccharicida).

Javesella discolor by (c) Sandy Rae, some rights reserved (CC BY). Used under a CC-BY license.

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Pronunciation

How to pronounce Delphacidae: /dɛlˈfæsɪdiː/

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Identification

are definitively separated from other planthopper by the presence of a large, prominent spur on the tibia of the hindleg. This spur is a unique diagnostic character within the Auchenorrhyncha. Additional features include a relatively compact body form compared to other Fulgoromorpha, and wings typically held roof-like over the body at rest. identification within the family requires examination of male genitalia, particularly the , as coloration is highly variable and unreliable for distinguishing species.

Images

Habitat

are strongly associated with grasses and grass-dominated . Specimens are frequently collected by sweeping from grasses, reeds, and other herbaceous vegetation. Many are specialized on particular grass , including agricultural cereals such as rice, wheat, and sugarcane.

Distribution

Worldwide distribution with approximately 2000 described . Particularly diverse in tropical regions, though well-represented in temperate zones. Documented from Africa (Nigeria, with tropical African forms noted as understudied), Asia (Southeast Asia, Indonesia, Pacific islands), Europe, North America, and the Middle East (Turkey).

Diet

All are phytophagous, feeding on plant sap through . Many species are specialized on grasses (Poaceae), with associations ranging from wild grasses to cultivated cereals.

Host Associations

Poaceae (grasses) - primary plants-level association; many specialized on particular grass species
Colocasia esculenta (taro) - plantPrimary for Tarophagus colocasiae
Oryza sativa (rice) - plant for Nilaparvata lugens and Sogatella furcifera
Saccharum officinarum (sugarcane) - plant for Perkinsiella saccharicida

Ecological Role

function as primary consumers in grassland and agricultural , converting plant to animal tissue. Several serve as for plant affecting cereal crops, mediating transmission between plants. Their are parasitized by various Hymenoptera, particularly Mymaridae and Trichogrammatidae, forming important trophic linkages in .

Human Relevance

Several are major agricultural pests causing significant economic damage to rice, sugarcane, and other cereal crops. The rice (Nilaparvata lugens) and white-backed planthopper (Sogatella furcifera) are particularly destructive pests of rice throughout Asia. These species also plant that cause additional crop losses. Management of delphacid pests relies heavily on using , chemical control, and crop varieties.

Similar Taxa

Cicadellidae (leafhoppers)Similar body plan and use; distinguished by absence of hind tibial spur and different wing venation
Cixiidae (cixiid planthoppers)Other planthopper in Fulgoromorpha; lacks the diagnostic hind tibial spur of
DerbidaeRelated planthopper ; distinguished by shape and absence of hind tibial spur

More Details

Taxonomic History

established by Leach in 1815. Classification within Fulgoromorpha has been stable, with recognized as a distinct lineage based on the hind tibial spur. The family includes several : Asiracinae, Delphacinae, Kelisiinae, Plesiodelphacinae, Stenocraninae, and Vizcayinae.

Research Challenges

African , particularly tropical forms, remain poorly known taxonomically. identification is complicated by extensive intraspecific variation in coloration and the necessity of examining male genitalia, which has historically limited progress in biodiversity documentation.

Biological Control

in the Mymaridae and Trichogrammatidae are important natural enemies of delphacid pests. of Anagrus, Gonatocerus, and related have been studied extensively for of Nilaparvata lugens, Sogatella furcifera, and other pest species in rice .