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Rice root weevil in Haryana



Rice root weevil in Haryana



International Rice Research Newsletter, 54: 20



A root weevil, Hydronomidius molitor Faust, is recorded (possibly for the first time from rice in India) attacking rice, together with Bagous sp., in Haryana, where it has caused heavy damage in recent years. The life-cycles of these 2 species and of Holotrichia insularis Brenske show many similarities. The larvae feed on the roots from July to mid-September then rest in the deeper soil layers for several months. They begin to attack within 2 weeks of transplanting in July, completely hindering plant growth. Yield losses in infested fields reach up to 50% or more. Normally 1-2 larvae/seedling will result in economic loss. During the summer, the larvae are found in earthen cocoons 14-30 cm deep in compact soil. The adults emerge in June-July and feed on grasses in the absence of rice and then the females oviposit in the rice-fields. The average numbers of root-weevil larvae on rice at a research station at Kaul were 13.7-21.4/plant in 1977-78, 7.1-24.7/plant in 1978-79, and 3.2-7.9/plant in 1979-80. The lower incidence in the last season is attributed to the prevailing drought conditions.

Accession: 038622674

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