In collaboration with Iranian Phytopathological Society

Authors

Department of Entomology, Faculty of Agriculture, Tarbiat Modares University

Abstract

Studies were conducted to investigate the antixenotic resistance of 15 Iranian rice cultivars to Sitophilus oryzae (L.) under laboratory conditions at 28 ±1°C, 70 ± 5% R.H. and 0:24 (L:D). The experiments were carried out under randomized complete block design in 2004. A mixture of 75 male/female of rice weevil was introduced in each of 4 replications for a period of 24h and 48h. In a free choice test, the orientation and colonization responses of the weevil were evaluated. There was not significant interaction between cultivar effects and time intervals, so a period of 24h was enough for adults settlement on their preferred cultivars. Twelve pairs of male and female weevils (1-8 days old) were released in each of 5 replications to estimate the oviposition response for choice test followed by egg-plug counts after 72h release. In both experiments, S. oryzae exhibited the lowest preference and oviposition on Kadus cultivar, therefore, Kadus could be considered as a potential resistant cultivar and to be investigated in further complementary experiments.

Keywords

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