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Efficacy of diflubenzuron plus methoprene against Sitophilus oryzae and Rhyzopertha dominica in stored sorghum

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Daglish, G. J. and Wallbank, B. E. (2005) Efficacy of diflubenzuron plus methoprene against Sitophilus oryzae and Rhyzopertha dominica in stored sorghum. Journal of Stored Products Research, 41 (3). pp. 353-360. ISSN 0022-474X

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Article Link: https://doi.org/10.1016/j.jspr.2004.06.001

Abstract

The efficacy of diflubenzuron (1 mg kg−1)+methoprene (1 mg kg−1) against Sitophilus oryzae (L.) and Rhyzopertha dominica (F.) in sorghum was evaluated in a silo-scale trial in southeast Queensland, Australia. Sorghum is normally protected from a wide range of insects by mixtures of grain protectants. The chitin synthesis inhibitor diflubenzuron was evaluated as a potential new protectant for S. oryzae in combination with the juvenile hormone analogue methoprene, which is already registered for control of R. dominica. Sorghum (ca 200 t) was treated after harvest in 2000 and assessed for treatment efficacy and residue decline during 6.5 months storage. The reproductive capacity of S. oryzae and R. dominica was greatly reduced in bioassays of treated sorghum throughout the trial, and efficacy remained relatively stable during the trial. An initial exposure of S. oryzae adults to treated sorghum for 2 weeks reduced F1 progeny production of all strains by 80.8–98.8%, but a second exposure of 4 weeks reduced F1 progeny production by 98.5–100%. In addition, the reproductive capacity of any S. oryzae progeny produced was greatly reduced. Exposure of R. dominica adults to treated sorghum for 2 weeks reduced F1 progeny production of all strains by 99.6–100%, including a methoprene-resistant strain. The results indicate that S. oryzae or R. dominica adults invading sorghum treated with diflubenzuron (1 mg kg−1)+methoprene (1 mg kg−1) would be incapable of producing sustainable populations.

Item Type:Article
Corporate Creators:Department of Agriculture and Fisheries, Queensland
Keywords:Diflubenzuron, Methoprene, Sitophilus oryzae, Rhyzopertha dominica, Stored sorghum
Subjects:Plant culture > Harvesting, curing, storage
Plant culture > Field crops > Sorghum
Plant pests and diseases > Pest control and treatment of diseases. Plant protection
Live Archive:06 Feb 2024 05:49
Last Modified:06 Feb 2024 05:49

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