Reference Report for SoyBase31698114107
| Title: | Evaluation of vegetable soybean genotypes for resistance to corn earworm (Lepidoptera: Noctuidae). |
| Authors: | Kraemer, M.E., Rangappa, M., Mohamed, A.I. |
| Source: | J. Entomol. Sci. 1997, 32(1):25-36 |
| Abstract: | Petri dish bioassays were used to evaluate terminal foliage from 47 field-grown genotypes of vegetable-type soyabean (Glycine max) from maturity groups III-VIII, for resistance to Helicoverpa zea in 1993 and 1994. Larvae reared on ""Sato"", IAC 100, V89-1301, V89-1563, and V88-100 had low mean weights, not significantly different from those on resistant controls. However, larval weights ranged from moderate to high on most vegetable-type soyabeans. The most susceptible genotypes were ""Guelph"", PI 561291 and ""Rokusun"", followed by ""Kanrich"", ""Kura"", ""Camp"", ""Wolverine"", G2246, G4032, ""Kim"", ""Hahto"", PI 561294, N2962 and D71-V89. Mortality averaged 2.9% in 1993 and 13.5% in 1994, but was not generally useful in evaluating resistance within maturity groups. High percentage mortality and low weights of larvae reared on both resistant and susceptible genotypes in maturity group VII/VIII in 1994 may have been related to the use of insect-damaged foliage. Soluble leaf sugar was determined in 1994 samples and ranged from 0.50% (PI 416868-B) to 1.04% (PI 561291) of dry weight. A small but significant positive correlation (r = 0.20, P = 0.009) was found between sugar content and larval weight in maturity groups III-VI. Exceptional low larval weights in maturity groups VII and VIII were not related to leaf sugar content. |
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