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Animalia
Arthropoda
Insecta
Orthoptera
Acrididae
Melanoplus
Melanoplus differentialis

Differential Grasshopper

Melanoplus differentialis
Local Pest Control
Melanoplus differentialis
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Summary

The differential grasshopper (Melanoplus differentialis) is a species of grasshopper belonging to the genus Melanoplus. It is found throughout northern Mexico, the central United States and southern Ontario, Canada. It is considered a pest over most of its range.

Properties

Colors

beige
black
ivory
green
white
yellow
pink

Size

28mm to 44mm (1.10" to 1.73")

Differential Grasshopper

Melanoplus differentialis
Local Pest Control

Tags

harmful
bite
garden pest
crop pest
pest

Scientific classification

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Description

Adult males grow to 28–37 mm, and females grow to 34–50 mm. They are brownish or greenish, and as they age the color will darken. Some nymphs can be bright yellow. There are black grooves on the pronotum. The male has bootlike appendages at the end of its abdominal tip. There are inverted chevrons along the hind femur, and the hind part of the tibia is yellowish with black spikes. All adults have yellow tarsi and antennae, or in some cases reddish-yellow antennae.

Range and habitat

The differential grasshopper is found throughout most of the United States, except for the northwest. Within its range, it is most often found in heavily weeded areas and grasslands, and even in vacant lots and other urban areas. This species is not migratory, but can travel a few miles to search for food. In the northern part of its range, M. differentialis is about as numerous as the two-striped grasshopper (Melanoplus bivittatus), but in the southern part of its range greatly outnumbers it.

Life cycle

There is one generation per year. An adult female lays up to six egg masses in soft soil, each of which can contain 40–200 eggs. The eggs begin embryonic development the summer they are laid, then enter diapause for the winter, to hatch over a period of about two weeks in early summer of the next year. After hatching, nymphs take about 32 days to reach adulthood. Their development is well synchronized, and most nymphs transform to winged adults during a period of just a few days. Differential grasshoppers are polyphagous, eating both grasses and forbs, but experiments have shown that they grow faster if fed forbs. The most favored food plants tend to be giant ragweed (Ambrosia trifida), common sunflower (Helianthus annuus), and prickly lettuce (Lactuca serriola). Adults can detect a chemical change in wilted lettuce and sunflowers, and will tend to avoid such plants.

Life cycle

Agricultural problems

The young grasshoppers feed on various grains, alfalfa and hay crops, while adults attack corn, cotton and deciduous fruit crops. A single swarm can destroy a crop in a few days. Because this species tends to feed in large swarms, it can be a serious threat to farming over most of its range.

Agricultural problems