Data from: Host plant water deficit stress impairs reproduction and development of the galling fly (Parafreutreta regalis), a biological control agent of Cape-ivy (Delairea odorata)
Principal Investigator(s): View help for Principal Investigator(s) US Department of Agriculture; National Agricultural Library
Version: View help for Version V1
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Project Citation:
US Department of Agriculture, and National Agricultural Library. Data from: Host plant water deficit stress impairs reproduction and development of the galling fly (Parafreutreta regalis), a biological control agent of Cape-ivy (Delairea odorata). Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2026-06-27. https://doi.org/10.3886/E250465V1
Project Description
Project Title:
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Data from: Host plant water deficit stress impairs reproduction and development of the galling fly (Parafreutreta regalis), a biological control agent of Cape-ivy (Delairea odorata)
Summary:
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Data from choice and no-choice tests associated with the paper cited below. Drought leading to water deficit stress is known to reduce performance of galling insects. The shoot tip-galling fly Parafreutreta regalis has been released for biological control of Cape-ivy (Delairea odorata) in California. Lack of moisture during the dry season causes wilting of Cape-ivy shoots, and subsequent reduced host quantity and quality could influence the fly’s ability to multiply and establish. We imposed water deficit stress on potted Cape-ivy plants, then measured the plant’s and insect’s response to water deficit compared to fully-watered plants. Water deficit stress was imposed during female oviposition (short-term), gall development (long-term), or full insect life cycle (long-term). Plants subjected to long-term water deficit showed declines in shoot growth, leaf area, and total biomass. In choice tests, 72% fewer galls were found on water deficit stressed plants, but there was no difference in the numbers of insects per gall. In no-choice tests, long-term water deficit reduced the number and size of galls by up to 51% and 39%, respectively, and puparia inside the galls were up to 35% smaller. Long-term water deficit also increased the time required for the insect to complete its life cycle (egg to adult) by about 10 days, and up to 80% fewer adults emerged, decreasing the fly’s rate of increase by up to five-fold. Our study shows that P. regalis will oviposit and develop successfully on water deficit-stressed plants, but declines in female preference, insect development and abundance could inhibit fly field establishment and/or population growth under climatic drought conditions.
Resources in this dataset:
Resource Title: Data from: Host plant water deficit stress impairs reproduction and development of the galling fly (Parafreutreta regalis), a biological control agent of Cape-ivy (Delairea odorata). File Name: CI Fly Drought Stress Biological Control Data Archive.csvResource Description: Tabular data for all choice and no-choice experimentsResource Software Recommended: MS Excel,url: https://www.microsoft.com/en-us/microsoft-365?ms.url=office365com&rtc=1
Resource Title: Data from: Host plant water deficit stress impairs reproduction and development of the galling fly (Parafreutreta regalis), a biological control agent of Cape-ivy (Delairea odorata).
File Name: CI Fly Drought Stress Biological Control Data Archive.csv
Resource Description: Tabular data for all choice and no-choice experiments
Resource Software Recommended: MS Excel,url: https://www.microsoft.com/en-us/microsoft-365?ms.url=office365com&rtc=1
Resource Title: Data dictionary text file describing column headings in the csv data file.. File Name: Data Dictionary for Archiving Feb17-2021.txtResource Description: Data dictionary text file describing column headings in the csv fileResource Software Recommended: MS Word,url: https://www.microsoft.com/en-us/microsoft-365?ms.url=office365com&rtc=1
Resource Title: Data dictionary text file describing column headings in the csv data file..
File Name: Data Dictionary for Archiving Feb17-2021.txt
Resource Description: Data dictionary text file describing column headings in the csv file
Resource Software Recommended: MS Word,url: https://www.microsoft.com/en-us/microsoft-365?ms.url=office365com&rtc=1
Resources in this dataset:
Resource Title: Data from: Host plant water deficit stress impairs reproduction and development of the galling fly (Parafreutreta regalis), a biological control agent of Cape-ivy (Delairea odorata). File Name: CI Fly Drought Stress Biological Control Data Archive.csvResource Description: Tabular data for all choice and no-choice experimentsResource Software Recommended: MS Excel,url: https://www.microsoft.com/en-us/microsoft-365?ms.url=office365com&rtc=1
Resource Title: Data from: Host plant water deficit stress impairs reproduction and development of the galling fly (Parafreutreta regalis), a biological control agent of Cape-ivy (Delairea odorata).
File Name: CI Fly Drought Stress Biological Control Data Archive.csv
Resource Description: Tabular data for all choice and no-choice experiments
Resource Software Recommended: MS Excel,url: https://www.microsoft.com/en-us/microsoft-365?ms.url=office365com&rtc=1
Resource Title: Data dictionary text file describing column headings in the csv data file.. File Name: Data Dictionary for Archiving Feb17-2021.txtResource Description: Data dictionary text file describing column headings in the csv fileResource Software Recommended: MS Word,url: https://www.microsoft.com/en-us/microsoft-365?ms.url=office365com&rtc=1
Resource Title: Data dictionary text file describing column headings in the csv data file..
File Name: Data Dictionary for Archiving Feb17-2021.txt
Resource Description: Data dictionary text file describing column headings in the csv file
Resource Software Recommended: MS Word,url: https://www.microsoft.com/en-us/microsoft-365?ms.url=office365com&rtc=1
Original Distribution URL:
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https://agdatacommons.nal.usda.gov/articles/dataset/Data_from_Host_plant_water_deficit_stress_impairs_reproduction_and_development_of_the_galling_fly_Parafreutreta_regalis_a_biological_control_agent_of_Cape-ivy_Delairea_odorata_/24666126
Scope of Project
Subject Terms:
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biological control;
Drought stress;
Water deficit stress;
Diptera;
weed management;
NP304;
data.gov;
ARS
Geographic Coverage:
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California
Time Period(s):
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2/1/2020 – 4/15/2020
Data Type(s):
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observational data
Collection Notes:
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DOI: 10.15482/USDA.ADC/1522573
Citation: Moran, Patrick J. (2021). Data from: Host plant water deficit stress impairs reproduction and development of the galling fly (Parafreutreta regalis), a biological control agent of Cape-ivy (Delairea odorata). Ag Data Commons. https://doi.org/10.15482/USDA.ADC/1522573 (Downloaded 2026-06-26)
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