This is a contribution from the IOBC-Global IWGO Conference.
Inheritance of an extended diapause trait in the Northern corn rootworm, Diabrotica barberi (Coleoptera: Chrysomelidae)
Article first published online: 20 AUG 2012
Published 2012. This article is a U.S. Government work and is in the public domain in the USA.
Journal of Applied Entomology
Special Issue: PROCEEDINGS OF THE 24th CONFERENCE OF THE INTERNATIONAL WORKING GROUP ON OSTRINA AND OTHER MAIZE PESTS (IWGO – IOBC GLOBAL)
Volume 138, Issue 3, pages 213–221, April 2014
How to Cite
French, B. W., Coates, B. S. and Sappington, T. W. (2014), Inheritance of an extended diapause trait in the Northern corn rootworm, Diabrotica barberi (Coleoptera: Chrysomelidae). Journal of Applied Entomology, 138: 213–221. doi: 10.1111/j.1439-0418.2012.01751.x
This article reports the results of research only. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture (USDA). USDA is an equal opportunity provider and employer.
- Issue published online: 17 MAR 2014
- Article first published online: 20 AUG 2012
- Manuscript Accepted: 9 JUL 2012
- Manuscript Received: 1 MAR 2012
- maize pest;
- maternal effects;
- pest management
Diapause is an adaptive trait that delays development or reproduction under unfavourable circumstances. The northern corn rootworm, Diabrotica barberi Smith & Lawrence, an important maize, Zea mays L., pest in the Diabroticite species complex, overwinters in diapause during the egg stage. Some NCR populations are adapted to crop rotation by expressing an extended diapause (ED) trait that delays embryonic development for 2 years. This ED trait has increased in frequency and geographic distribution since first reported in Illinois in 1932. Reciprocal single pair crosses among beetles from a laboratory colony with the ancestral 1-year diapause trait and field collected beetles with the 2-year ED trait indicated that ED females laid significantly more ED eggs than did females with the 1-year diapause trait regardless of male genotype. The ED trait was highly heritable [realized heritability (h2) = 0.698 ± 0.314], with genetic dominance (D) of the trait strongly influenced by female genotype. Selection of the ED trait and maintenance of polymorphic diapause phenotypes within maize-soybean cropping systems is discussed in relation to response to a fluctuating environment and as a potentially advantageous life history adaptation.