Diatraea saccharalis

(Fabricius, 1794)

sugarcane borer, sugar-cane borer

Diatraea saccharalis, commonly known as the sugarcane borer, is a in the Crambidae native to tropical and subtropical regions of the Western Hemisphere. The was first described by Johan Christian Fabricius in 1794 and has since become a significant agricultural pest. It was introduced to Louisiana around 1855 and has subsequently spread throughout the Gulf Coast states of the United States. The larvae are particularly destructive to sugarcane, but also attack corn, rice, sorghum, and various grass species.

Diatraea saccharalis by no rights reserved, uploaded by Hugo Hulsberg. Used under a CC0 license.Diatraea saccharalis male ventral by Rebecca Graham, Department of Agriculture Western Australia. Used under a CC BY 3.0 au license.Diatraea saccharalis male dorsal by Rebecca Graham, Department of Agriculture Western Australia. Used under a CC BY 3.0 au license.

Pronunciation

How to pronounce Diatraea saccharalis: //daɪəˈtriːə sæˌkæɹəˈrælɪs//

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

Identification

can be distinguished from similar stalk-boring by their white to buff coloration and relatively small size. Females deposit in distinctive clusters of 10–20 flattened, elliptical to oval eggs that overlap like fish in a shingle-like arrangement on plant leaves. Larvae are identified by the combination of creamy white color with conspicuous round brown or black spots on most body segments, and their presence tunneling within stalks. Similar include the southwestern corn borer (Diatraea grandiosella), Mexican rice borer (Eoreuma loftini), European corn borer (Ostrinia nubilalis), and neotropical borer (Diatraea lineolata); these require careful examination of adult genitalia or larval spot patterns for definitive identification.

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Habitat

Agricultural fields and natural grasslands in tropical and subtropical regions. Larvae develop inside the stalks of plants, particularly sugarcane, corn, rice, sorghum, and various wild grasses including johnsongrass (Sorghum halepense), Paspalum, Panicum, Holcus, and Andropogon.

Distribution

Native to the Caribbean, Central America, and warmer parts of South America south to northern Argentina. Introduced to the United States: first detected in Louisiana around 1855, subsequently spread to other Gulf Coast states including Texas, Mississippi, and Florida. Also present in the Galápagos Islands.

Seasonality

Two to three per year in most regions. are active during warmer months. In temperate regions, occurs as fully grown larvae in inside harvested stalk stubble. Activity patterns vary with latitude and local climate conditions.

Diet

Larvae feed internally on the pith of plant stalks. Young larvae initially feed on leaves or leaf axes before tunneling into stalks. Older larvae bore up and down the pith. Documented host plants include sugarcane (Saccharum spp.), corn (Zea mays), rice (Oryza sativa), sorghum (Sorghum bicolor), Sudangrass, johnsongrass (Sorghum halepense), and various wild grasses including Paspalum, Panicum, Holcus, and Andropogon .

Host Associations

  • Saccharum spp. - primary sugarcane, main economic
  • Zea mays - corn/maize
  • Oryza sativa - rice
  • Sorghum bicolor - grain sorghum
  • Sorghum halepense - johnsongrass, wild
  • Paspalum spp. - wild grasses
  • Panicum spp. - wild grasses
  • Holcus spp. - wild grasses
  • Andropogon spp. - wild grasses

Life Cycle

hatch in 3–7 days. Larval stage lasts approximately 25 days; young larvae feed externally on leaves or leaf axes for a few days before boring into stalks. Larvae tunnel through the pith, completing development in 2–3 weeks after entering stalks. occurs in approximately 10 days within inside stalks. Two to three occur per year. occurs as fully grown larvae in cells inside stalk stubble remaining after harvest.

Behavior

Females deposit in shingle-like overlapping clusters on plant leaves. Larvae are obligate stalk borers, tunneling through plant pith and feeding internally. Older larvae bore up and down stalks, potentially causing stalk breakage below grain . Larval tunneling increases host susceptibility to stalk rot and lodging.

Ecological Role

As a herbivore, D. saccharalis functions as a significant pest in agricultural , reducing yield and plant vigor through stalk tunneling. The serves as for agents including the larval Cotesia flavipes and parasitoid Trichogramma galloi, which have been deployed in large- biological control programs.

Human Relevance

Major agricultural pest causing substantial economic damage to sugarcane, corn, rice, and sorghum. In Brazil, programs using Cotesia flavipes cover over 30,000 km² and Trichogramma galloi over 5,000 km². Insecticidal control is only effective when applied before larvae bore into stalks. Cultural management includes early planting, destruction of to kill larvae, and elimination of alternate such as johnsongrass. The is subject to resistance monitoring in transgenic crop programs.

Similar Taxa

More Details

Taxonomic history

Originally described as Phalaena saccharalis by Fabricius in 1794. Later transferred to Diatraea. Some sources list authorship as Guenée, 1862, though Fabricius, 1794 is the accepted original description.

Biological control success

Brazil operates one of the world's largest programs against this pest, with releases covering an area larger than Belgium.

Invasion dynamics

Introduction to Louisiana around 1855 represents one of the earliest documented lepidopteran invasions in North American agriculture. The has continued to expand its range in the United States over 150+ years.

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Sources and further reading