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21 November 2019 West Indian Canefly (Hemiptera: Delphacidae): An Emerging Pest of Louisiana Sugarcane
B. E. Wilson, J. M. Beuzelin, R. T. Richard, R. M. Johnson, K. A. Gravois, W. H. White
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Abstract

The West Indian canefly, Saccharosydne saccharivora (Westwood) (Hemiptera: Delphacidae), is a sporadic pest of sugarcane in Louisiana which has recently emerged as a more consistent threat with outbreaks occurring in 2012, 2016, 2017, and 2019. Surveys of commercial fields in 2016 revealed that S. saccharivora infestations were present throughout Louisiana sugarcane and populations peaked in mid-June before declining. High minimum winter temperatures are generally associated with S. saccharivora outbreaks. Six insecticide evaluations demonstrated effective control with several insecticides including λ-cyhalothrin, flupyradifurone, acetamiprid, and imidacloprid. In five of the six insecticide trials, S. saccharivora infestations had substantially declined by 21 d after treatment. Effects of insecticidal control of S. saccharivora on sugar yields were detected in one of four small plot trials in which yield data were collected. Linear regression revealed S. saccharivora cumulative insect days in a grid sampling study were inversely associated with sugar yields. Results from these collective experiments suggest impacts on sugar yields are influenced by pest density and infestation duration. Differences were detected in numbers of S. saccharivora nymphs and adults as well as sooty mold coverage among commercial sugarcane cultivars with more than twofold increases in the most susceptible compared to resistant cultivars. The research presented herein documents the impact of S. saccharivora to Louisiana sugarcane and provides important ground work for developing effective pest management strategies. Future research efforts should aim to identify ecological factors influencing population dynamics, varietal preferences, and economic thresholds.

© The Author(s) 2019. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.
B. E. Wilson, J. M. Beuzelin, R. T. Richard, R. M. Johnson, K. A. Gravois, and W. H. White "West Indian Canefly (Hemiptera: Delphacidae): An Emerging Pest of Louisiana Sugarcane," Journal of Economic Entomology 113(1), 263-272, (21 November 2019). https://doi.org/10.1093/jee/toz284
Received: 30 July 2019; Accepted: 23 September 2019; Published: 21 November 2019
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KEYWORDS
imidacloprid
insecticidal control
integrated pest management
Saccharosydne saccharivora
λ-cyhalothrin
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