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Quantifying seasonal thrips population dynamics in relation to temperature and wheat senescence.

Authors :
Workneh, Fekede
Ehrlich, Brittany
Herron, Benjamin
Chinnaiah, Senthilraja
Gautam, Saurabh
Gadhave, Kiran R.
Rush, Charles M.
Source :
Entomologia Experimentalis et Applicata. May2024, Vol. 172 Issue 5, p446-453. 8p.
Publication Year :
2024

Abstract

The incidence of thrips in the High Plains of Texas (USA) was investigated using sticky traps during the 2021 and 2022 seasons. Yellow sticky traps were placed in wheat fields and collected and replaced weekly and thrips were counted under a dissecting scope. Weekly wheat reflectance measurements were taken using a hyperspectral radiometer from which normalized difference vegetation index (NDVI) was calculated for each measurement. Temperature (degree day) and NDVI values were then related to weekly thrips incidence using regression. Thrips incidence curvilinearly increased over time during each of the two seasons and reached a maximum in the middle of June, after which it declined sharply. There was a strong positive relationship between degree days and thrips incidence until the incidence reached a maximum, whereas the incidence was negatively related to NDVI values. Analysis of the thrips changes over time progress with the two variables together showed that degree day has greater impact on thrips incidence than NDVI. However, the steep decline in thrips abundance after its peak in mid‐June suggests that senesced wheat fields with NDVI values near zero are not significant sources of thrips, signifying the importance of wheat growth stages in the seasonal population dynamics of thrips. Overall, the 2‐year results were generally consistent in trends of thrips incidence during the season, which may need to be considered when choosing vegetable planting dates in the region. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00138703
Volume :
172
Issue :
5
Database :
Academic Search Index
Journal :
Entomologia Experimentalis et Applicata
Publication Type :
Academic Journal
Accession number :
176409934
Full Text :
https://doi.org/10.1111/eea.13428