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Insects 2014, 5(4), 961-973; doi:10.3390/insects5040961

Influence of Rice Seeding Rate on Efficacies of Neonicotinoid and Anthranilic Diamide Seed Treatments against Rice Water Weevil

1
DuPont Crop Protection, Stine-Haskell Research Center, Newark, DE 19711, USA
2
Louisiana State University Agricultural Center, Department of Entomology, 404 Life Sciences Building, Baton Rouge, LA 70803, USA
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 9 September 2014 / Revised: 31 October 2014 / Accepted: 7 November 2014 / Published: 1 December 2014
(This article belongs to the Collection Integrated Pest Management)
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Abstract

Rice in the U.S. is frequently seeded at low rates and treated before sowing with neonicotinoid or anthranilic diamide insecticides to target the rice water weevil. A previous study of the influence of seeding rate on rice water weevil densities showed an inverse relationship between seeding rates and immature weevil densities. This study investigated interactive effects of seeding rate and seed treatment on weevil densities and rice yields; in particular, experiments were designed to determine whether seed treatments were less effective at low seeding rates. Four experiments were conducted over three years by varying seeding rates of rice treated at constant per seed rates of insecticide. Larval suppression by chlorantraniliprole was superior to thiamethoxam or clothianidin, and infestations at low seeding rates were up to 47% higher than at high seeding rates. Little evidence was found for the hypothesis that seed treatments are less effective at low seeding rates; in only one of four experiments was the reduction in weevil densities by thiamethoxam greater at high than at low seeding rates. However, suppression of larvae by neonicotinoid seed treatments in plots seeded at low rates was generally poor, and caution must be exercised when using the neonicotioids at low seeding rates. View Full-Text
Keywords: rice water weevil; seed treatments; seeding rates; neonicotinoids; anthranilic diamides rice water weevil; seed treatments; seeding rates; neonicotinoids; anthranilic diamides
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hamm, J.; Lanka, S.; Stout, M. Influence of Rice Seeding Rate on Efficacies of Neonicotinoid and Anthranilic Diamide Seed Treatments against Rice Water Weevil. Insects 2014, 5, 961-973.

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