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Plantwise Technical Factsheet

rice grasshopper (Oxya chinensis)

Host plants / species affected
Gossypium (cotton)
Oryza sativa (rice)
Panicum miliaceum (millet)
Phragmites australis (common reed)
Sorghum bicolor (sorghum)
Triticum (wheat)
Zea mays (maize)
List of symptoms/signs
Leaves  -  external feeding
Symptoms
O. chinensis feeds on tender rice leaves in the rice field, causing leaf damage, and sometimes also affects the stem and ear of rice.
Prevention and control

Integrated Control

Integrated control of O. chinensis in China has been discussed by Sun et al. (1991) and Gu (1990).

Cultural Control and Sanitary Methods

Ploughing rice fields in autumn and spring to a depth of 10-20 cm exposes the eggs on the surface of the field, to be destroyed by sunshine or eaten by natural enemies. By this means, some eggs may also be buried too deeply in the soil for hatching to take place. Ploughing can achieve 70-80% control.

If the back of the rice field is made airtight with mud before the soil is prepared for planting, to a height of about 5-10 cm, ca 30% control may be achieved.

Narrow mounds may be scraped in spring, to a depth of about 2-3 cm. This cuts up the eggs blocks and exposes eggs on the surface of the rice field to sunshine. Soaking the field in water, harrowing and dredging up egg blocks and weeds can also aid control.

Farmers may be mobilized into action to catch and kill the pests, which are seen feeding on rice leaves during the jointing and booting stages (fifth- and sixth-generation nymphs). A control threshold of three individuals/m² has been suggested (Anon., 1989). This can alleviate harm to the rice ear, and also reduce the population of the pest for the coming year. Adults may be ground to locust-powder and used as a kind of forage for fish and shrimp.

Biological Control

There has been much interest in classical biological control as a tactic in the management of O. chinensis, particularly in Tangshan, China (Sun et al., 1991). The most frequently tried method of achieving biological control has been by augmentative releases of frogs and chickens.

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:


Impact
In China, with recent changes in environmental conditions and reforms of farming systems, the area affected by O. chinensis is growing and the density of the pest is continually increasing, usually 50-100 per m² in an average rice field, and up to 200-300 per m² in a seriously infested field. It has been reported that O. chinensis can cause serious losses to crops, in particular to rice. In the rice field, 2-4 adults per m² can reduce output by 6.8-17.8%.

In India, O. chinensis has been listed as among the five most important rice pests in the Sikkim Hills (Thakur, 1984).
Related treatment support
Plantwise Factsheets for Farmers
Saeed, M.; Hussain, F.; Batool, M.; CABI, 2013, English language
Saeed, M.; Hussain, F.; Batool, M.; CABI, 2013, Urdu language
 
 
External factsheets
Rice Insect and Pest Control Management Factsheets, Bangladesh Rice Research Institute (BRRI), Bengali language
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