Chrysolina quadrigemina |
Last updated: 18/05/2024
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(Also known as: St Johns wort beetle; Klamath weed beetle) |
The following alerts are based on the data in the tables below. An absence of an alert does not imply the substance has no implications for human health, biodiversity or the environment but just that we do not have the data to form a judgement.
Environmental fate |
Ecotoxicity |
Human health |
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A phytophagous beetle that can be used to control St. Johns wort (Hypericum perforatum). |
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St Johns wort (Hypericum perforatum) |
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Pastures; Grassland; Ranchland |
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Bronze,purple and green iridescent beetle around 3-5mm long with a domed shape. Adult lays eggs on the basal leaves of the plant. Larvae hatch in spring, feed and then pupate in the soil. Found where ever St Johns wort grows. Beetle and larvae eat the flower heads and terminal buds of the plant preventing seeding and stunting growth. Adapted to a climate with hot, dry summers and mild, rainy winters. |
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1944, first released in USA as biocontrol agent |
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Class: Insecta; Order: Coleoptera; Family: Chrysomelidae |
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Not applicable |
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Not applicable |
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Not applicable |
EC Regulation 1107/2009 (repealing 91/414) |
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Not applicable |
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Not applicable |
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Not applicable |
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Not applicable |
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No |
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ATAustria |
BEBelgium |
BGBulgaria |
CYCyprus |
CZCzech Republic |
DEGermany |
DKDenmark |
EEEstonia |
ELGreece |
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ESSpain |
FIFinland |
FRFrance |
HRCroatia |
HUHungary |
IEIreland |
ITItaly |
LTLithuania |
LULuxembourg |
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LVLatvia |
MTMalta |
NLNetherlands |
PLPoland |
PTPortugal |
RORomania |
SESweden |
SISlovenia |
SKSlovakia |
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ISIceland |
NONorway |
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Not applicable |
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Yes |
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Herbivore |
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Macro-organism |
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Natural |
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Consumption |
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The beetle originated in Europe and is very common in the UK. Well established as a control for St. Johns wort in Australia. It has been introduced into many other countries including the USA. |
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Reared for commercial applications on living St Johns wort (Hypericum perforatum) |
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Land management |
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St Johns wort (Hypericum perforatum) |
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Pastures; Grassland; Ranchland |
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Chrysolina quadrigemina (Suffr.) |
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Most countries require a licence to be issued before non-native macro-organisms may be released as biocontrol agents |
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Not applicable |
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Not applicable |
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Not applicable |
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Not applicable |
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Living organism |
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Klamath Weed beetle |
Biological Control of Weeds |
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Usually supplied as fecund adults, which should be released in batches of 200-300 per infested area |
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As this parameter is not normally measured directly, a surrogate measure is used: ‘Photochemical oxidative DT₅₀’. Where data is available, this can be found in the Fate Indices section below. |
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Soil adsorption and mobility |
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None
Terrestrial ecotoxicology |
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Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source No adverse effects identified or expected |
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Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source No adverse effects identified or expected |
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Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source No adverse effects identified or expected |
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Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source No adverse effects identified or expected |
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HUMAN HEALTH AND PROTECTION |
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Not applicable |
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Q3 Q = Miscellaneous data from online sources 3 = Unverified data of known source No adverse effects identified or expected |
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Carcinogen |
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Endocrine disruptor |
XNo, known not to cause a problem |
A0 A = Chromosome aberration (EFSA database) 0 = No data ; B0 B = DNA damage/repair (EFSA database) 0 = No data ; C0 C = Gene mutation (EFSA database) 0 = No data ; D0 D = Genome mutation (EFSA database) 0 = No data ; E3 E = Unspecified genotoxicity type (miscellaneous data source) 3 = Negative |
XNo, known not to cause a problem |
Reproduction / development effects |
Acetyl cholinesterase inhibitor |
Neurotoxicant |
XNo, known not to cause a problem |
XNo, known not to cause a problem |
XNo, known not to cause a problem |
Respiratory tract irritant |
Skin irritant |
Skin sensitiser |
XNo, known not to cause a problem |
XNo, known not to cause a problem |
No data found |
Eye irritant |
Phototoxicant |
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XNo, known not to cause a problem |
No data found |
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No evidence of adverse toxicological issues have been identified |
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No information available |
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Not listed (Not listed) |
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Chrysolina quadrigemina |
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Record last updated: |
18/05/2024 |
Contact: |
aeru@herts.ac.uk |
Please cite as: |
Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242 |