This readme.txt file was generated on 20230127 by Hailey Shanovich (UMN graduate student and research assistant) and amended 20250121 by Brian Aukema (bhaukema@umn.edu) (principal investigator on USDA SCRI grant; added author contact information and URL from publication)

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GENERAL INFORMATION
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1. Title of Dataset:

Seasonal phenology of two nonindigenous Polydrusus species in Minnesota hybrid hazelnut orchards

2. Author Information

Shanovich, Hailey N.(hnshanovich@gmail.com), Lisak, Sarah C. (lisak007@umn.edu); Alexa N.; Lindsey, Amelia, R. I.; Aukema, Brian H. (bhaukema@umn.edu)

3. Date of data collection: 2020-05-07 to 2021-08-01

4. Geographic locations of data collection: University of Minnesota, UMore Park, Rosemount, Minnesota and the University of Minnesota Saint Paul Agricultural Research Station in St. Paul, Minnesota

5. Information about funding sources that supported the collection of the data: Sponsorship: United States Department of Agriculture - Specialty Crop Research Initiative (Grant 2019-51181-30025)

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SHARING/ACCESS INFORMATION
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1. Licenses/restrictions placed on the data: Attribution 3.0 United States license (https://creativecommons.org/licenses/by/3.0/us/)

2. Publications that cite or use the data:
Lisak, S.C., Shanovich, H.N., Lindsey, A.R.I., and B.H. Aukema. The Polydrusus weevils of the US and Canada: identification and insights into the ecology of two nonnative species in hazel (Corylus spp.) The Canadian Entomologist 156, e10, 1-17. DOI: 10.4039/tce.2024.7

3. Recommended citation for the data:
Shanovich, Hailey N; Lisak, Sarah C; Lindsey, Amelia R I; Aukema, Brian H. (2023). Seasonal phenology of two nonindigenous Polydrusus species in Minnesota hybrid hazelnut orchards. Retrieved from the Data Repository for the University of Minnesota, https://doi.org/10.13020/45d9-en03

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FILE OVERVIEW
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1. Polydrusus_sampling_data.csv: These data were compiled to examine the seasonal phenology of adult Polydrusus weevils in hybrid hazelnut orchards and examine the relative phenologies and sex-ratios between the nonindigenous species found

2. Daily_temperatures_and_GDD.csv: These data were compiled in order to calculated accumulated growing degree days for the collected Polydrusus weevils each year. Data was collected via a datalogger at the field sites. 

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Additional Data Description
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The period in the csv files is a placeholder for the statistical analysis. This is recognized in R. 

 Polydrusus_sampling_data.csv:

1. Site: the field site that the data was collected at. RSMT = the University of Minnesota UMore Park in Rosemount, MN and SpC = the University of Minnesota agricultural research station on the “Saint Paul campus” 

2. Year: The year of data collection

3. Date: the date of data collection in MM/DD/YYYY format

4. Genotype: the genotype of each hybrid hazelnut plant sampled for Polydrusus weevils

5. Plant: The location of each plant in the field used as a unique identifier in order to use as a random effect in analyses due to repeated sampling of each plant throughout each season and years
 
6. Ordinal.date: the ordinal date of each data collection date within each year

7. Spp.: The species of nonindigenous Polydrusus weevils. Impressifrons = Polydrusus impressifrons. Formosus = Polydrusus formosus

8. Sex: the sex of weevils sampled. M = male; F = female

9. Number of individuals: the number of weevils collected from each plant each sampling date

Daily_temperatures_and_GDD.csv:

1. Year: The year of data collection

2. Date: the date of data collection in MM/DD/YYYY format

3. Mean.daily.temp.C: the recorded mean daily temperature in degrees Celsius from the cataloguer

4. GDD: the number of growing degrees days per date. Calculated starting 1 January of each year. We used a lower development threshold of 8.8ºC, the minimum threshold for strawberry root weevil (Otiorhynchus ovatus (L.))(Coleoptera: Curculionidae: Entiminae) which is the closest related species found to Polydrusus spp. with an established lower development threshold, being in the same subfamily

5. Accumulated.GDD: the accumulated growing degree days per date, which is the sum of the current date’s growing degree days and the cumulation of the previous dates of that year