Inheritance of resistance in soybean PI165673 to Dectes stem borer, Dectes texanus LeConte (Coleoptera: Cerambycidae)

Dectes stem borer, Dectes texanus LeConte, is a pest of soybeans, Glycine max (L.) Merrill, in North America that causes significant yield losses because of lodging of infested plants. D. texanus infestations in soybean fields are increasing across Kansas and other states, necessitating the development or improvement of effective tactics to control this pest. The use of D. texanus -resistant soybean cultivars is a desirable strategy to control this pest since cultural and chemical options are limited.  In previous studies, soybean PI165673 was shown to exhibit D. texanus -resistance. The objective of this research is to determine the inheritance of D. texanus resistance in PI165673. Plants from 108 F_2:3 families from the cross between susceptible K07_1544 and resistant PI165673 were tested in the field for D. texanus -resistance. Twenty days after infestation, the numbers of oviposition punctures (OvP) and larvae (Lv) were counted on each plant to estimate the OvP/Lv resistance ratio. Segregation for D. texanus resistance in the K07_1544/PI165673 F_2:3 population indicated that resistance is controlled by more than one gen inherited as recessive traits. QTL mapping of resistance is in progress using parental polymorphic SSR markers.