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Amblyseius degenerans

Predatory Mite of Thrips

Amblyseius degenerans is a dark brown predator mite that is slightly bigger than the related Amblyseius cucumeris. Thanks to the dark colour this mite is more conspicuous when walking on a leaf or in the flower. Moreover, Amblyseius degenerans is more mobile.

The life cycle of this predatory mite is nearly identical to the related Amblyseius cucumeris. The eggs of both mites are visibly not discernible and are both deposited on the underside of the leaf close to the main vein. In the short larval stage the mite hardly moves and does not eat. During the two subsequent nymphal stages and during the adult stage the predatory mite is continuously moving to look for prey.


  • Good development in winter and summer.
  • Fast population build-up.
  • Less sensitive to low humidity.
  • Can survive on pollen.
  • Higher mobility.
  • Better thrips control in the flower.
  • Non diapausing

However, Amblyseius degenerans has another life style than Amblyseius cucumeris. It stays more on the flower, where it can easily build up a population on pollen only. The predatory mite prefers thrips larvae. Thanks to its regular presence in the flower, it controls thrips more efficiently in the flower than Amblyseius cucumeris.

The eggs of Amblyseius degenerans endure low humidities better. Therefore, a population can easily develop in greenhouses at cold winter weather or hot summer weather. Moreover, this mite is non diapausing, and can therefore be introduced in winter time without any problem.