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Abstract
Soybean looper [Chrysodeixis includens, Walker] is a chronic pest of soybean [Glycine max (L.) Merr.] in the southern USA. Efforts are ongoing to supplement insecticides with soybean-derived insect resistance QTLs. The cultivar Boggs is as resistant to soybean looper as the best combination of insect resistance QTLs isolated previously. Boggs carries QTLs on chromosomes 3 and 10 and 13. Alleles on chromosomes 3 and 10 hinder insect growth (antibiosis). Both were previously mapped in separate populations but not evaluated together which is the key to their effectiveness. The allele on chromosome 13 conditions non-preference (antixenosis) resistance and was previously mapped from a susceptible soybean line. QTLs were mapped in a RIL population of Boggs PI 494851 and antibiosis QTLs were validated in an F2:3 population of Boggs Benning. Validated resistance alleles from Boggs will add to those already available to improve cultivars to complement other insect control measures.