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Species Page

rough strawberry root weevil

Otiorhynchus rugosostriatus
This information is part of a full datasheet available in the Crop Protection Compendium (CPC). Find out more information on how to access the CPC.
©CAB International. Published under a CC-BY-NC-SA 4.0 licence.

Distribution

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Invasive
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Host plants / species affected

Main hosts

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Fragaria (strawberry)
Fragaria ananassa (strawberry)

List of symptoms / signs

Fruit - reduced size
Leaves - abnormal colours
Leaves - external feeding
Roots - external feeding
Stems - external feeding
Whole plant - dwarfing
Whole plant - external feeding
Whole plant - wilt

Symptoms

The larvae of O. rugosostriatus feed on the roots and crowns of strawberry plants, causing wilting or stunting. Leaves on heavily infested plants may turn red and fruit size can be decreased. Adults feed on leaves, causing semi-circular notching around the edges.

Larval feeding damage to the seedlings of woody plants takes the form of stem girdling. This typically consists of a 1-cm band around the soil line, before the stems become woody, particularly on plants that are about 8 weeks old and between 5 and 15 cm in height. Adults cause notching on the leaves of young ornamental shrubs and trees.

Prevention and control

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:

Impact

O. rugosostriatus is a significant economic pest of strawberries and, to a lesser extent, raspberries and other soft fruits. The larval stage (grub) causes the most damage, by feeding on roots and crowns during the autumn. With heavy infestations, root feeding can severely stunt plants and reduce fruit size, leading to yield reductions. Damaged plants can die, especially during drought or frost conditions; they also become increasingly susceptible to disease. The adults chew notches in the leaf margins, but this rarely causes economic damage in soft fruits. O. rugosostriatus is considered a strawberry pest in Europe and North America, where it occurs as part of a root weevil complex. In the UK, for example, strawberry is damaged by larvae of O. rugosostriatus, O. ovatus (strawberry root weevil), Otiorhynchus sulcatus (black vine weevil), O. clavipes, O. rugifrons and Sciaphilus asperatus (Coghill and Light, 1981). In the USA, O. ovatus and O. sulcatus typically occur with O. rugosostriatus in strawberry fields. Root weevils can seriously damage strawberry plantings if no control measures are taken.

The presence of adult weevils in harvested raspberry fruit can lead to a decrease in value or crop rejection in the USA, where raspberry cultivation is concentrated in Washington State (Antonelli et al., 1988).

O. rugosostriatus is a pest in tree nurseries, for example, on Euonymus, Rhododendron, Taxus and Thuja in containers. Larvae cause damage by feeding on the roots and the lower stem at ground level. Larval feeding can cause the complete girdling of young stems. Adult weevils feed on leaves, which can cause significant cosmetic damage to ornamental plants (e.g. Helm, 2001). As on strawberries, O. rugosostriatus usually occurs within a root weevil complex in nurseries in Europe and North America. In addition to the species mentioned above for strawberry, these include Otiorhynchus singularis (clay-coloured weevil), Nemocestes incomptus [Geoderces incomptus] (obscure root weevil) and Sciopithes obscurus (Wood's weevil). In North America, larvae and adults of O. rugosostriatus attack seedlings of a wide range of tree species, especially in coastal nurseries; although it is usually only of economic significance in unsprayed nurseries in the USA (Maier, 1986; Shanks, 1991). Taxus hedges surrounding nurseries, compost, and vegetable waste were identified as sources of infestation in a Belgian study (Casteels and de Clercq, 1988).