Journal of Entomological Science (1997) 32, 25-36

Mark E. Kraemer, Muddappa Rangappa and Ali I. Mohamed (1997)
Evaluation of vegetable soybean genotypes for resistance to corn earworm (Lepidoptera: Noctuidae)
Journal of Entomological Science 32 (1), 25-36
Abstract: Petri dish bioassays were used to evaluate terminal foliage from 47 field-grown genotypes of vegetable-type soybean, Glycine max (L.) Merrill, from maturity groups III through VIII, for resistance to corn earworm, Helicoverpa zea (Boddie), 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 resistant controls. However, larval weights ranged from moderate to high on most vegetable-type soybeans. The most susceptible genotypes were "Geulph", 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 percent 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 through VI. Exceptional low larval weights in maturity groups VII and VIII were not related to leaf sugar content.
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Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa zea	Soybean (Glycine max)