Journal of Entomological Science (2016) 51, 69-78

Lucas E. Cazado, Augusto S. Casmuz, David G. Riley, Franco S. Scalora, Gerardo A. Gastaminza and M. Gabriela Murúa (2016)
Rhyssomatus subtilis (Coleoptera: Curculionidae) impact in soybean plant stands
Journal of Entomological Science 51 (1), 69-78
Abstract: The black soybean weevil, Rhyssomatus subtilis (Fiedler), is an important but infrequently studied insect pest of soybean, Glycine max (L.) Merrill, in South America. Severe crop damage occurs when the adult weevils attack soybean seedlings, resulting in reduced plant stands, and when weevils feed on and oviposit in seedpods. The objectives of this 3-yr study were to quantify early-season damage caused by R. subtilis to terminal buds and plant stands in soybean and evaluate insecticide seed treatments under field conditions relative to this damage. Terminal bud damage is the most consistent criteria for determining early-season damage by R. subtilis to soybean. The results indicated that R. subtilis can cause as much as 36% plant stand loss in soybean. Thiamethoxam and a mixture of ethiprole + fipronil provided significant levels of control of R. subtilis damage, with the higher doses of each product tending to provide longer-lasting protection.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): M. Gabriela Murua, David G. Riley

Research topic(s) for pests/diseases/weeds:
damage/losses/economics
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Rhyssomatus subtilis	Soybean (Glycine max)	Argentina