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Department of Entomology

Department of Entomology
123 W. Waters Hall
1603 Old Claflin Place
Kansas State University
Manhattan KS 66506-4004

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Diaz-Montano, John

Diaz-Montano, John Masters 2006 jdm@ksu.eduArea(s) of Specialization:
Host Plant Resistance to Insects

Bio Brief

Components of soybean resistance to the soybean aphid, Aphis glycines Matsumura


B.S. Agronomic Engineering, National University of Colombia. Palmira, Colombia, 2001


The soybean aphid is a recently introduced pest of soybeans, Glycine max (L.) Merr. in North America. The damage estimates due to this pest are projected to be in billions of dollars in the United States. A. glycines populations increase quickly and spread very rapidly, adults and nymphs feed on soybean plants causing severe damage and yield reduction over 50%. A. glycines also vectors viral diseases such as soybean mosaic virus.

Since 2000 when soybean aphid was detected in Wisconsin and other Midwestern states, many studies on this insect and its possible control methods have been initiated. Plant resistance to this aphid sp. is one possible route to achieve sustainable control. The overall objectives of my research are:

1. To screen several soybean entries for resistance to the soybean aphid
2. To assess the categories of resistance (antibiosis, antixenosis or tolerance) of selected soybean entries
3. To study the effect of A. glycines on chlorophyll content on resistant and susceptible materials
4. To observe the feeding behavior of the soybean aphid by using electrical penetration graph (EPG).


Different protocols that provide highly repeatable results were developed to screen soybean entries and to assess the categories of resistance. Using these protocols 240 soybean entries were evaluated. Nine entries showed intermediate resistance and two entries were highly resistant to the soybean aphid. One of the two entries, KS1639 property of KSU, had both antibiosis and antixenosis as categories of resistance.


Diaz-Montano, J., J. C. Reese, J. Louis, L. R. Campbell, and W. T. Schapaugh. 2007. Feeding behavior by the soybean aphid (Hemiptera: Aphididae) on resistant and susceptible soybean genotypes. Journal of Economic Entomology 100: 984-989.

Diaz-Montano, J., J.C. Reese, W.T. Schapaugh and L.R. Campbell. 2007. Chlorophyll loss caused by soybean aphid (Hemiptera: Aphididae) feeding on soybean. Journal of Economic Entomology 100: 1657-1662

Diaz-Montano, J., J. C. Reese, W. T. Schapaugh, and L. R. Campbell. 2006. Characterization of antibiosis and antixenosis to the soybean aphid (Hemiptera: Aphididae) in several soybean genotypes. Journal of Economic Entomology 99: 1884-1889.

Frei, A., J.M. Bueno, J. Diaz-Montano, H. Gu, C. Cardona, and S. Dorn. 2004. Tolerance as a mechanism of resistance to Thrips palmi in common beans. Entomologia Experimentalis et Applicata 112: 73–80

Diaz-Montano, J., C. Cardona, and J.M. Bueno. 2003. Caracterización de genotipos de fríjol (Phaseolus vulgaris L.) por su resistencia a Thrips palmi Karny (Thysanoptera: Thripidae). Rev. Colombiana Entomol. 29(1): 35-42. [English title: Characterization of dry bean genotypes (Phaseolus vulgaris L.) for resistance to Thrips palmi Karny (Thysanoptera: Thripidae).]

Cardona, C., A. Frei, J.M. Bueno, J. Diaz H. Gu, and S. Dorn. 2002. Resistance to Thrips palmi (Thysanoptera: Thripidae) in Beans. Journal of Economic Entomology; 95(5): 1066-1073.