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Article

Balancing Forage Production, Seed Yield, and Pest Management in the Perennial Sunflower Silphium integrifolium (Asteraceae)

1
Museo Egidio Feruglio-CONICET, Fontana 140, 9100 Trelew, Chubut, Argentina
2
The Land Institute, 2440 E Water Well Rd, Salina, KS 67401, USA
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(10), 1471; https://doi.org/10.3390/agronomy10101471
Received: 1 August 2020 / Revised: 21 September 2020 / Accepted: 23 September 2020 / Published: 25 September 2020
(This article belongs to the Special Issue Multifunctional Forages)
The perennial sunflower Silphium integrifolium Michx. (Asteraceae), also known as silflower, is a prospective dual-purpose forage plus grain crop. Pre-flowering biomass harvest for animal feed and the subsequent delay in plant growth and anthesis has the potential to benefit seed yield and/or offset yield loss from native pests, such as the native North American Eucosma giganteana (Lepidopera: Tortricidae). The aim of this study was to develop a cropping technology for silflower to (A) balance forage and grain production and (B) minimize seed loss. Silflower produced high-quality forage, but biomass harvest in early spring reduced same-season seed production by 45%. Despite significantly delaying flowering, forage harvest alone did not effectively reduce Eucosma colonization, although treating plants with the insecticide permethrin did reduce colonization. Our results do not support the proposal that S. integrifolium could be profitably harvested for both high quality forage and as an oilseed grain within the same season. Nevertheless, our findings suggest the possibility of developing a strategy of alternating between forage or seed production, depending on their differential economic values. The choice between harvesting biomass vs. seed could be made much later in the season for this perennial crop than the choice of planting an annual forage vs. annual grain crop. View Full-Text
Keywords: Silphium integrifolium; dual-purpose crop; forage; silage; Eucosma giganteana; permethrin Silphium integrifolium; dual-purpose crop; forage; silage; Eucosma giganteana; permethrin
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MDPI and ACS Style

Vilela, A.E.; González-Paleo, L.; Ravetta, D.A.; Murrell, E.G.; Van Tassel, D.L. Balancing Forage Production, Seed Yield, and Pest Management in the Perennial Sunflower Silphium integrifolium (Asteraceae). Agronomy 2020, 10, 1471. https://doi.org/10.3390/agronomy10101471

AMA Style

Vilela AE, González-Paleo L, Ravetta DA, Murrell EG, Van Tassel DL. Balancing Forage Production, Seed Yield, and Pest Management in the Perennial Sunflower Silphium integrifolium (Asteraceae). Agronomy. 2020; 10(10):1471. https://doi.org/10.3390/agronomy10101471

Chicago/Turabian Style

Vilela, Alejandra E., Luciana González-Paleo, Damián A. Ravetta, Ebony G. Murrell, and David L. Van Tassel. 2020. "Balancing Forage Production, Seed Yield, and Pest Management in the Perennial Sunflower Silphium integrifolium (Asteraceae)" Agronomy 10, no. 10: 1471. https://doi.org/10.3390/agronomy10101471

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