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Species Page

small cabbage bug

Eurydema pulchrum
This information is part of a full datasheet available in the Crop Protection Compendium (CPC); For information on how to access the CPC, click here.
©CAB International. Published under a CC-BY-NC-SA 4.0 licence.


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Host plants / species affected

Main hosts

show all species affected
Eutrema wasabi (Wasabi)

List of symptoms / signs

Fruit - external feeding
Fruit - lesions: black or brown
Inflorescence - external feeding
Inflorescence - lesions on glumes
Leaves - honeydew or sooty mould
Leaves - necrotic areas
Seeds - external feeding
Seeds - lesions on seeds


Hori (1968) reported that E. rugosum gradually altered its feeding site from the vascular element to the mesophyll of the host plant with the advance of the bug stage. When the bug fed on the vascular element, there were no symptoms which could be observed externally, but the tube-like salivary sheath was formed along the whole length of the feeding puncture. When the bug feeds on the mesophyll, a unique small whitish spot appears on the plant, with an assemblage of radial or branch-like stripes starting from its centre. The size increases with the advance of the bug stage. These spots are made by the stylets which pass through the tissue and destroy the cells in their passage; injury is primarily due to mechanical destruction of cells and the withdrawal of the cell contents, but seems not to be caused by toxins in the salivary secretion. A young leaf under concentrated attack by the bugs withers very soon. Therefore when infestation by the bugs is severe in the seedling stage of cruciferous crops, damage is serious. In Japan, however, E. rugosum and E. pulchrum are not of very great economic importance.

Hori (1974, 1975) showed that the amounts of chlorophyll, amino acid and the activity of some oxidative enzymes in leaf tissue are changed by the feeding activity of the bugs. He suggested that these changes may halt the development of plant injury at the simple lesion stage.

Prevention and control

Although no agricultural chemical pesticides for Eurydema have been registered in Japan, synthetic pyrethroids (cypermethrin, permethrin, tau-fluvalinate, bifenthrin, cyhalothrin, etofenprox and fenitrothion) could be used for the control of Eurydema. These pesticides are registered for stink bugs on other crops, and for other insects affecting crucifers. However, natural control by parasitoid wasps may be a preferable means of control.


In Japan, the economic impact of E. rugosum and E. pulchrum is very small. No agricultural chemical pesticides have been registered in Japan specifically for these stink bugs on crucifers.