Listronotus bonariensis
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Author(s): Simon Hinkley & Ken Walker, Museum Victoria
Source: PaDIL
Listronotus bonariensis (Kuschel, 1955) - (Argentine stem weevil)
This weevil is native to South America and a serious invasive forage pest (mainly of ryegrass) in New Zealand (first record 1927). The adults feed on the leaves and the larvae mine the stems. Corn, and cereals are also attacked. The introduction into New Zealand occurred possibly through adults mixed with grass seeds. The weevil has also spread to Australia.
The adult is about 3 mm long, light greyish to brown-black with 3 white stripes on the pronotum and numerous hairs and flat waxy scales on the cuticle. The life-cycle from egg, through 4 larval stages, to mature adult lasts about 2-3 months. Pupation occurs in the soil. There are 2-3 generations per year. Progress has been made in developing resistant ryegrass (Lolium spp.) varieties. The introduction of the parasitoid Microctonus hyperodae (established in 1991) has also been very successful, with parasitization rates reaching 75-90% in some seasons. However, parasitization rates declined later with the weevil becoming resistant to the parasitoid.
| Vernacular names | |
|---|---|
| • English: | Argentine stem weevil |
| • Français: | charançon argentin des tiges |
| • Português: | broca-da-coroa-do-trigo |
- Other images of Listronotus bonariensis (IPM Images and PaDIL - click to enlarge)
head
damage to Lolium
