Melanaphis sacchari

(Zehntner, 1897)

Sugarcane Aphid, Sugarcane Aphid Complex

Melanaphis sacchari, commonly known as the sugarcane aphid, is a phloem-feeding native to the Old World that has become a major agricultural pest of sorghum and sugarcane. First recorded feeding on sorghum in Texas in 2013, it rapidly spread across the southern United States, causing significant yield losses. The reproduces primarily through , with all individuals being female and giving birth to live young. can double every 4 to 8 days under favorable conditions, making monitoring and timely intervention critical for management.

Melanaphis sacchari from CSIRO by Unknown authorUnknown author. Used under a Public domain license.

Pronunciation

How to pronounce Melanaphis sacchari: //mɛˈlanəfɪs ˈsakəraɪ//

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Identification

Distinguished from other sorghum-infesting aphids by the combination of pale body color and black appendages. (Schizaphis graminum) are light green with a dark green stripe down the back. (Rhopalosiphum maidis) are dark bluish-green. Yellow sugarcane aphids (Sipha flava) are bright lemon yellow with rows of dark spots and short cornicles, and do not produce honeydew. The presence of copious honeydew production is a reliable field indicator of M. sacchari .

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Habitat

Agricultural fields and areas with plants, particularly sorghum, sugarcane, and johnsongrass. Colonies develop on the underside of leaves, starting in the lower and spreading upward. Heavy occur in warm, dry conditions.

Distribution

Native to the Old World; now established in the southern United States including Texas and surrounding states. Present in Hawaii and the conterminous 48 United States. Records from Brazil (Ceará, Espírito Santo, Minas Gerais, Pará, Pernambuco, Paraná, Rio de Janeiro, Rio Grande do Sul, São Paulo). Sexual morphs documented in China, Japan, and Mexico.

Seasonality

Active year-round in tropical and subtropical regions. In temperate areas, activity begins with spring of plants and continues through fall. Peak damaging typically occur during summer months under warm, dry conditions. occurs as in China (on Miscanthus sacchariflorus); parthenogenetic overwintering likely in milder climates.

Diet

Phloem sap feeder specializing on Poaceae. Primary include Sorghum bicolor (grain and forage sorghum), Saccharum officinarum (sugarcane), and Sorghum halepense (johnsongrass). Has been observed on Miscanthus sacchariflorus in China where and occur.

Host Associations

Sorghum bicolor - primaryMajor agricultural ; grain and forage sorghum
Saccharum officinarum - primaryOriginal ; sugarcane
Sorghum halepense - primaryJohnsongrass; important
Miscanthus sacchariflorus - primary for and in China

Life Cycle

Primarily parthenogenetic. Females give birth to live nymphs without mating. Nymphs develop into in approximately 5 days under optimal conditions. Adults live about 4 weeks. has been documented in limited geographic areas (China, Japan, Mexico), where males and -laying females occur. In China, eggs overwinter on Miscanthus sacchariflorus.

Behavior

Forms dense colonies on the undersides of leaves, beginning in the lower and spreading upward. Produces large quantities of honeydew, which accumulates on upper leaf surfaces and can support growth. Winged forms develop for when colonies become crowded or quality declines. Can migrate into grain (panicles) late in the season, causing harvest complications due to honeydew .

Ecological Role

Herbivore that can significantly reduce plant productivity through direct feeding and honeydew production. Honeydew and associated can reduce . Serves as prey for various natural enemies including lady beetles, syrphid flies, and parasitic . The itself has few known compared to other aphid .

Human Relevance

Major agricultural pest of sorghum and sugarcane. Since 2013, has become one of the most damaging insect pests of grain and forage sorghum in the southern United States. Yield losses result from direct feeding, honeydew , stalk lodging, and harvest difficulties. Management relies on hybrids, , foliar (particularly flupyradifurone/Sivanto Prime), and conservation. have been established for treatment decisions based on plant growth stage and .

Similar Taxa

Sipha flavaYellow sugarcane aphid; similar and but bright lemon yellow with dark spots, short cornicles, and no honeydew production
Schizaphis graminumGreenbug; light green with dark green stripe, produces honeydew but different body coloration
Rhopalosiphum maidisCorn leaf aphid; dark bluish-green, typically feeds in sorghum rather than leaf undersides

More Details

Rapid Population Growth

can double every 4 to 8 days depending on hybrid resistance, environmental conditions, and natural enemy abundance. This rapid increase necessitates twice-weekly scouting once aphids are detected.

Insecticide Resistance Management

Chlorpyrifos and are less effective for control and can flare by eliminating natural enemies. Flupyradifurone (Sivanto Prime) is currently the primary labeled insecticide for postemergence control in sorghum.

Seed Treatment Efficacy

Neonicotinoid (clothianidin, imidacloprid, thiamethoxam) provide 4 to 6 weeks of protection after planting, with value depending on timing of initial .