Abstract
Soybean looper (SBL), Pseudoplusia includens (Walker), oviposition preference among soybean (Glycine max (L.) Merrill) genotypes ‘Kirby’, ‘CaSoy 17’, CatIR 81-296, and PI 229358 was examined in two field tests with caged plants. In both cage tests, the number of SBL eggs deposited on 81-296 plants was significantly greater than or equal to egg deposition on plants of other genotypes. Oviposition was consistently lower on ‘Kirby’ compared with the other genotypes. Relative oviposition preference for ‘CaSoy 17’ and PI 229358 varied between the two tests. SBL larvae were also reared on foliage of each genotype to determine relative larval resistance. PI 229358 and 81-296 were significantly more resistant to SBL larvae (reduced larval and pupal weights, increased development times) compared with ‘CaSoy 17’, while ‘Kirby’ was the most susceptible of the four genotypes. The relative preference of SBL moths for oviposition on the resistant genotype 81-296 compared with the susceptible genotype ‘Kirby’ indicates that larval resistance and adult oviposition preference in soybean are not necessarily positively correlated.
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