Asian Rice Gall Midge

Disease

Asian Rice Gall Midge

Orseolia oryzae

insect

In a Nutshell

    Rice gall midge forms tubular gall structures at the base of tillersAffected tillers inhibit growth of leaves and fails to produce paniclesdeformed, wilted, and rolled leaves

Hosts: %1$s

· Rice

Symptoms

Rice gall midge forms a tubular gall at the base of tillers, producing elongated silvery leaf sheaths called onion leaf or silver shoot (about 1 cm wide and 10−30 cm long). The affected tiller inhibits growth of leaves and fails to produce panicles. Plant stunting and leaf deformity, wilting and rolling are also symptoms caused by drought, potassium deficiency, salinity, and by rice thrips. To confirm cause of problem, check for presence of insects. Particularly, elongate-tubular eggs and maggot-like larva feeding inside developing buds.

Trigger

The Asian rice gall midge is found in irrigated or rainfed wetland rice environment during the tillering stage of the rice crop. It is also common in upland and deep-water rice. The insect remains dormant in the pupa stage but become active again when the buds start growing after the rains. Population density is favored by cloudy or rainy weather, cultivation of high-tillering varieties, intensive management practices.

Biological Control

Parasitization with platygasterid, eupelmid, and pteromalid wasps (parasitize the larvae), phytoseiid mites (feed on eggs), spiders (feed on adults) have successfully been used. Planting more flowering plant that attract the insects around the rice field also helps.

Chemical Control

Always consider an integrated approach with preventive measures together with biological treatments if available. Use time insecticide applications accurately to control outbreak by spraying on emergence of rice gall brood. Phosalone, carbosulfan, chlorpyriphos, fipronil and thiamethoxam have been used against the Asian Rice Gall Midge.

Preventive Measures

    Use resistant varietiesPlant early, at the beginning of the rainy seasonAvoid close spacingUse light traps to collected using light traps along with sticky board with oil or glue to collect the mothsRemove all off-season plant hosts around the rice fieldKeep land fallow during off seasonPlant flowering plant that attract beneficial insects around the rice fieldsCheck the optimum recommendation of nitrogen and potash fertilizerPlow ratoons of the previous crop immediately after harvest




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