Study

Grass management intensity affects butterfly and orthopteran diversity on rice field banks

  • Published source details Giuliano D., Cardarelli E. & Bogliani G. (2018) Grass management intensity affects butterfly and orthopteran diversity on rice field banks. Agriculture, Ecosystems & Environment, 267, 147-155.

Actions

This study is summarised as evidence for the following.

Action Category

Manage rice field banks to benefit butterflies and moths

Action Link
Butterfly and Moth Conservation

Restrict certain pesticides or other agricultural chemicals

Action Link
Butterfly and Moth Conservation
  1. Manage rice field banks to benefit butterflies and moths

    A replicated, site comparison study in 2016 on three rice farms in Pavia province, Italy (Giuliano et al 2018) found that unmown, herbicide-free rice field banks had a higher abundance and species richness of butterflies than banks which were mown or sprayed with herbicide. On unmanaged banks, the abundance (1.2–12.2 individuals/100 m) and species richness (0.7–2.6 species/100 m) of butterflies was higher than on mown (abundance: 0.5–6.1 individuals/100 m; richness: 0.4–2.0 species/100 m) or sprayed banks (abundance: 0.1–2.3 individuals/100 m; richness: 0.1–1.1 species/100 m). Endangered large copper Lycaena dispar butterflies were present on more unmanaged banks (48 individuals) than on sprayed banks (10 individuals). See paper for other species results. Banks (1–2 m wide) between paddy fields on three farms were managed in one of three ways: sprayed with herbicide (Glyphosate) in April, mown 1–3 times between late April and August, or left unmanaged with permanent herbaceous cover. From April–September 2016, butterflies were surveyed monthly on 160–440-m-long transects on 30 field banks (13 sprayed, 13 mown, four unmanaged).

    (Summarised by: Andrew Bladon)

  2. Restrict certain pesticides or other agricultural chemicals

    A replicated, site comparison study in 2016 on three rice farms in Pavia province, Italy (Giuliano et al 2018) found that herbicide-free rice field banks had a higher abundance and species richness of butterflies than banks which were sprayed with herbicide. On unsprayed banks, the abundance (1.2–12.2 individuals/100 m) and species richness (0.7–2.6 species/100 m) of butterflies was higher than on banks sprayed with herbicide once/year (abundance: 0.1–2.3 individuals/100 m; richness: 0.1–1.1 species/100 m). Endangered large copper Lycaena dispar butterflies were present on more unmanaged banks (48 individuals) than on sprayed banks (10 individuals). See paper for other species results. Banks (1–2 m wide) between paddy fields on three farms were either sprayed with herbicide (Glyphosate) in April, or left unmanaged with permanent herbaceous cover. From April–September 2016, butterflies were surveyed monthly on 160–440-m-long transects on 17 field banks (13 sprayed, four unsprayed).

    (Summarised by: Andrew Bladon)

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