| tudies were conducted in the field and greenhouse to identify sources of rice water weevil (Lissorhoptrus oryzophilus Kuschel) resistance in rice, Oryza sativa L., and determine the mechanisms of resistance. Rice lines of various sources, including breeding lines, somaclone lines and world collection lines, were evaluated. Tolerance was investigated using replicated insecticide treated and untreated plots in a split-plot design, and antibiosis and/or antixenosis were assessed using caged insect-infested plants in randomized block designs. Resistance predictors included rice water weevil larval populations, larval root pruning damage, plant height and grain yield.;Anther culture lines 95-2836 and 95-3527, Louisiana breeding lines 8720906 and 8721937, tissue culture lines 112 and 4754, and five lines of various sources (AL6029, LA2218, TX22041, URN199, URN200) exhibited moderate tolerance to the rice water weevil. These lines did not have significant ;Antixenosis and/or antibiosis tests revealed that two tissue culture lines (244, 2232), three Louisiana breeding lines (8723417, 8723518, 8825454) and two Texas lines (TX12685 and TX13079) sustained significantly... |
