Asian Journal of Plant Sciences 1682-3974 1812-5697 Asian Network for Scientific Information 10.3923/ajps.2006.923.931 Ekvised S. Jogloy S. Akkasaeng C. Keerati-Kasikorn M. Kesmala T. Buddhasimma I. Patanothai A. 6 2006 5 6 The objectives of this study were to estimate broad sense heritability for thrips number parameters and thrips damage parameters and to evaluate correlation between thrips number parameters and thrips damage parameters and correlations of these parameters with agronomic traits. A total number of 192 peanut progenies derived from F2 generation of 16 crosses were evaluated by multiple assessment method staring at 30 days after planting (DAP) for number of thrips adults, number of lavae, number of total thrips, percentage of damaged plants, percentage of damaged leaves and visual damage rating in F4 through F6 generation in three environments under natural infestation of thrip population. Some agronomic characters were evaluated at harvest. A randomized complete block design with six replications in three environments was used. Heritability estimates across evaluation times for thrips number parameters were generally lower and lesser consistent than those for plant damage parameters. Selection for lower thrips number alone would be either inconsistent or ineffective. These results suggest that greater genetic gain for thrips resistance in peanut can be achieved by selection on a family basis using plant damage parameters rather than using thrips number parameters as selection criteria. The lack of correlation between thrips number parameters and plant damage parameters implies that different genetic mechanisms control thrips resistance in this population and inherit independently. Weak correlations between thrips resistance parameters and agronomic characters also indicate the independent inheritance of these characters. Considering high heritability estimates and simplicity of evaluation, the improvement of thrips resistance in this population based on plant damage parameters would be possible.

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