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Preliminary field screening of 50 rice lines of various origin in 1990 for resistance to rice water weevil, Lissorhoptrus oryzophilus Kuschel, yielded several lines with potential for resistance. These lines were divided into two groups and evaluated in the field in 1991 and 1992. One group was evaluated specifically for tolerance and the other was tested for antibiosis or antixenosis or both. Significant differences were found among the lines tested for tolerance using rice water weevil larval population levels, root damage ratings, plant height, and grain yield as indicators. The comparison of untreated and treated plots indicated that lines AL6029, LA2218, TX22041, URN199 and URN200 showed tolerance to the rice water weevil. Tolerance was expressed in part as the ability of the lines to recover from root damage and produce high grain yield while supporting a high rice water weevil larval population. Lines TX12685 and TX13079 in the antixenosis test showed moderate levels of resistance to the rice water weevil, with significantly lower larval populations than the susceptible standard ‘Mars’.
N'Guessan et al. (Wed,) studied this question.