George C. Kent Professor

Cronin, J. T. and S. W. Wilson. 2007. Description, life history, and parasitism of a new species of delphacid planthopper (Hemiptera: Fulgoroidea). Annals of the Entomological Society of America 100: 640-648.

ABSTRACT

Delphacodes scolochloa Cronin and Wilson is a newly discovered delphacid planthopper that feeds and oviposits exclusively on the stems of sprangletop (Scolochloa festucacea; Poaceae) in the prairie pothole region of northeastern North Dakota, USA. Delphacodes scolochloa is bivoltine. It is also wing-dimorphic but populations are composed predominantly of flightless brachypters. Macropters incur a substantial cost in terms of reduced longevity and fecundity relative to brachypters. The parasitoid complex attacking D. scolochloa consists of two egg parasitoids, Anagrus nigriventris Girault and A. columbi Perkins (Hymenoptera: Mymaridae), and one undescribed dryinid. The proportion of eggs parasitized averages 21% and is density independent.

Keywords: Anagrus nigriventris, egg parasitoid, planthopper, prairie potholes, Scolochloa festucacea

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Harman, R. R., J. Goddard II, R. Shivaji and J. T. Cronin. 2020. Diverse forms of density-dependent emigration and their population-dynamic consequences. American Naturalist 195: 851-867.
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Cronin, J. T., J. Goddard II, A. Muthunayake and R. Shivaji. 2020. Modeling the effects of trait-mediated dispersal on coexistence of mutualists. Mathematical Biosciences and Engineering 17: 7838-7861.