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Assessing the temporal dynamics of Frankliniella schultzei (Thysanoptera: Thripidae) in commercial soybean crops in North Brazil

Assessing the temporal dynamics of Frankliniella schultzei (Thysanoptera: Thripidae) in... Thrips are considered a secondary pest of soybean in Brazil, but high densities have been noticed since the last harvests (2017/18 and 2018/19), yet no study has provided an initial hypothesis regarding the causes of such events. We aimed to identify some of the factors related to Frankliniella schultzei Trybom (Thysanoptera: Thripidae) temporal dynamics in commercial soybean crops located in Tocantins (Northern Brazil). We undertook evaluations during soybean vegetative, flowering, and fruiting stages on 200 plants per field in each sampling date (n = 22). Our results indicated that the densities of F. schultzei were similar among fields and soybean phenological stages. The density of thrips showed a significant negative relationship with rainfall, but it was not related to either air temperature, photoperiod, relative humidity, or wind speed. The predators' density was less than 170 individuals (summing all assessments), and it was not associated with thrips density. This study indicates rainfall as the leading factor associated with the temporal dynamics of F. schultzei in commercial soybean crops. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Agricultural and Forest Entomology Wiley

Assessing the temporal dynamics of Frankliniella schultzei (Thysanoptera: Thripidae) in commercial soybean crops in North Brazil

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Publisher
Wiley
Copyright
© 2021 The Royal Entomological Society
ISSN
1461-9555
eISSN
1461-9563
DOI
10.1111/afe.12471
Publisher site
See Article on Publisher Site

Abstract

Thrips are considered a secondary pest of soybean in Brazil, but high densities have been noticed since the last harvests (2017/18 and 2018/19), yet no study has provided an initial hypothesis regarding the causes of such events. We aimed to identify some of the factors related to Frankliniella schultzei Trybom (Thysanoptera: Thripidae) temporal dynamics in commercial soybean crops located in Tocantins (Northern Brazil). We undertook evaluations during soybean vegetative, flowering, and fruiting stages on 200 plants per field in each sampling date (n = 22). Our results indicated that the densities of F. schultzei were similar among fields and soybean phenological stages. The density of thrips showed a significant negative relationship with rainfall, but it was not related to either air temperature, photoperiod, relative humidity, or wind speed. The predators' density was less than 170 individuals (summing all assessments), and it was not associated with thrips density. This study indicates rainfall as the leading factor associated with the temporal dynamics of F. schultzei in commercial soybean crops.

Journal

Agricultural and Forest EntomologyWiley

Published: Sep 14, 2021

Keywords: Common blossom thrips; pest management; population ecology; seasonal dynamic; tropical crops

References