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Plantwise Factsheets for Farmers

Rice Short-horned Grasshopper

Oxya hyla intricata
Cambodia

Recognize the problem

Short-horned grasshoppers and oriental migratory locusts feed on leaf margins by cutting out areas on leaves and cut-off panicles. A clear distinction between grasshopper and locust damage as compared to damage caused by other leaf feeders is the characteristic feeding marks on leaves and shoots, large portions of leaf edges consumed, and cut-off panicles. To further confirm, check for insect presence: presence of yellow and brown nymphs and adults feeding on rice foliage with faces on leaf. Locusts are the swarming phase of certain species of short-horned grasshopper in the family Acrididae.

Background

Wetter environments are suitable for the development of short-horned grasshoppers, while locusts may prefer dry environments. The short-horned grasshoppers are common in moist and swampy areas. They are abundant during September and October. Under unfavourable conditions, the adults swarm and migrate.

Management

  • Flood the stubbles, shave bunds and sweep along the bunds to reduce the breeding ground.
  • Avoid frequent pesticide spray, and encourage biological control agents which occur naturally, e.g. wasps, parasitic flies, parasitic worms or nematodes, ants, birds, frogs, web-spinning spiders, fungal pathogens, and a certain species of entomopathogenic fungus – Metarhizium acridum.
  • Use local made poison baits from salt water and rice bran.
  • When there is an outbreak, (> 10% damage) use insecticides foliar sprays to control grasshoppers in rice fields.
Ref: IRRI Knowledge Bank

When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval.

The recommendations in this factsheet are relevant to: Cambodia

Authors: General Directorate of Agriculture (GDA)
No. 54B/49F, St. 395-656, Sangkat Teuk La Ak, Khan Toul Kork, Phnom Penh
tel: +855 23 631 9 070 ©CAB International. Published under a CC-BY-SA 4.0 licence.

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