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Beech witches broom mite - Cymoptus waltheri

By N A Martin (2019)

Classification

Phylum:
Arthropoda
Class:
Arachnida
Subclass:
Acari
Order:
Trombidiformes
Suborder:
Prostigmata
Superfamily:
Eriophyoidea
Family:
Eriophyidae
Subfamily:
Eriophyinae
Tribe:
Aceriini
Scientific Name:
Cymoptus waltheri (Keifer, 1939)
  • Drawing of side view of a protogyne adult Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). The adult mite is very tiny, 0.133-0.209 mm long. Image: Dave Manson © Drawing published in Fauna of New Zealand 1984, vol. 5, fig. 338.
    Drawing of side view of a protogyne adult Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). The adult mite is very tiny, 0.133-0.209 mm long. Image: Dave Manson © Drawing published in Fauna of New Zealand 1984, vol. 5, fig. 338.
  • A witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Nicholas A. Martin
    A witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Nicholas A. Martin
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Common Names

Beech witches broom mite
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Synonyms

Eriophyes waltheri Keifer, 1939
Aceria waltheri (Keifer, 1939)

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Taxonomic Notes

The Beech witches broom mite was first found on a New Zealand Silver beech tree, Lophozonia menziesii (Nothofagaceae) that had been planted in California. At that time the scientific name for Silver beech trees was Nothofagus menziesii. The mites were described and named by a Californian scientist, H.H. Keifer in 1939 as Eriophyes waltheri.

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Biostatus and Distribution

This endemic gall mite is found on silver beech, Lophozonia menziesii (Nothofagaceae) in the North and South Islands. The tree used to be called Nothofagus menziesii. The mite is associated with witches broom galls found on this species of tree. However, mites are sometimes found in other sheltered sites on this and other native beech trees.

Conservation status: The mite is not threatened.

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Life Stages and Annual Cycle

This gall mite is very tiny. Adult female mites are about, 0.130-0.209 mm long. The adult mite is like a tiny white cow's horn with two pairs of legs at the wide end of the horn. Adult female mites lay tiny spherical eggs. The larva that hatches from an egg looks like a tiny adult. The mite larva moults (changes skin) into a nymph. There is one nymphal stage that also looks like a small adult. The last juvenile stage moults into an adult mite. There are males and females.

There are two forms of the adult female. The form associated with inducing the galls and the main multiplication of the population is the protogyne. The other form, the deutogyne, is associated with dispersal to new branches, trees and survival when no new shoots are being produced by host trees. One difference between the two forms is that the deutogynes of this species have fewer microtubercles on their body.

Walking
The mites use their legs for walking, but can also hold on to the plant with the tip of thier abdomen, which acts as a sucker.

Feeding and forming the galls
The mites have pointed mouth parts that puncture the surface cells of plant leaves. They suck up the cell contents. During feeding, the mites may inject saliva into the plant. In the area where the mites are feeding in opening buds, the tree produces shoots with many buds. When multiple buds develop producing a cluster of short stems, this is called a witches broom. The mites shelter in the gall and breed there. The galls protect the gall mites from predators. The gall may also maintain a high humid atmosphere around the mites.

Dispersal to new shoots and trees
In the summer when the tree stops growing new shoots and the witches broom gall is less suitable for breeding, it is presumed that the mite population produces deutogynes. This form of the mite is better able to withstand adverse conditions. It has been found sheltering on leaves with erineum, hairy growths induced by the feeding of another species of gall mite. It is unlikely that the dispersing mites walk all the way to new suitable shoots on their current host tree or another tree. It is believed that many mites are dispersed by wind. Some species of mite climb to prominent places on plants and stand waiting for a gust of wind to take them away.

  • Drawing of side view of a protogyne adult Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). The adult mite is very tiny, 0.133-0.209 mm long. Image: Dave Manson © Drawing published in Fauna of New Zealand 1984, vol. 5, fig. 338.
    Drawing of side view of a protogyne adult Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). The adult mite is very tiny, 0.133-0.209 mm long. Image: Dave Manson © Drawing published in Fauna of New Zealand 1984, vol. 5, fig. 338.
  • Drawing of side view of a deutogyne adult Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). The adult mite is very tiny, 0.133-0.209 mm long and has fewer microtubercles on its body. Image: Dave Manson © Drawing published in Fauna of New Zealand 1984, vol. 5, fig. 346.
    Drawing of side view of a deutogyne adult Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). The adult mite is very tiny, 0.133-0.209 mm long and has fewer microtubercles on its body. Image: Dave Manson © Drawing published in Fauna of New Zealand 1984, vol. 5, fig. 346.
  • The arrow points to a tiny Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae) in a bud of a witches broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae). Image: Nicholas A. Martin © Plant & Food Research
    The arrow points to a tiny Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae) in a bud of a witches broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae). Image: Nicholas A. Martin © Plant & Food Research
  • A close up of a witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
    A close up of a witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
  • A young compact witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
    A young compact witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
  • A witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Nicholas A. Martin
    A witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Nicholas A. Martin
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Recognition

This mite requires special procedures and taxonomic knowledge to identify specimens. However, its presence on a plant can be recognised from associated plant damage symptoms. This mite species is the only one known to induce a witch's broom galls on Silver beech, Lophozonia menziesii (Nothofagaceae).

Similar galls on other plants are caused by other species of mite, insect or microorganism.

  • A witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Nicholas A. Martin
    A witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Nicholas A. Martin
  • A young compact witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
    A young compact witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
  • A close up of a witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
    A close up of a witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
  • A close up of a witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
    A close up of a witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
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Natural Enemies

No natural enemies of this species of mite have been recorded, but predatory mites may feed on them.

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Host Plants

The Beech witches broom mite is found on its host plant, Silver beech, Lophozonia menziesii (Nothofagaceae) where it lives in buds that are part of Witches broom galls which is induced by the mites feeding on opening buds. These galls are a proliferation of shoots. The dispersal and overwintering stage, the deuteronyne is sometimes found in leaf erineum of silver beech and red beech, Fuscospora fusca.

Beech witches broom mites have pointed mouth parts that puncture the surface cells of young buds and leaves. The plant responds to their feeding by producing more buds that are colonised by the mites. This compact kind of growth is commonly called a witch's broom that is named after fungal induced galls on British birch trees.

Table: Host plants of the Beech witches broom mite, Cymoptus waltheri (Acari: Prostigmata: Eriophyidae) from Plant-SyNZ database (7 May 2019). The reliability score shows the quality of evidence for the host association (1-10, 10=high).
Common Name(s)Scientific NameFamilyReliability IndexBiostatus
Red beech, Hutu, Hututawai, Raunui, Tawai, TawhaiFuscospora fusca (Hook.f.) Heenan & SmissenNothofagaceae6endemic
Silver beech, Tawai, TawhaiLophozonia menziesii (Hook.f.) Heenan & SmissenNothofagaceae10endemic
  • The silhouette of aA witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Nicholas A. Martin
    The silhouette of aA witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Nicholas A. Martin
  • A witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Nicholas A. Martin
    A witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Nicholas A. Martin
  • A young compact witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
    A young compact witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
  • A close up of a witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
    A close up of a witch's broom gall on Silver beech, Lophozonia menziesii (Nothofagaceae) induced by the feeding in opening buds by the Beech witches broom mite, Cymoptus waltheri (Acari: Eriophyidae). Image: Nicholas A. Martin © Plant & Food Research
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Additional Information

Eriophyid gall mites belong to the super family Eryiophyoidea. These mites have several unusual features. For example, though most mites have four pairs of legs like spiders, Eriophyoid mites have only two pairs of legs. Many of these mites can induce host plants to form galls, some of which may be very complex. Some species of these mites can transmit plant viruses that may cause plant diseases and plant death.

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Information Sources

Manson DCM 1984. Eriophyinae (Arachnida: Acari: Eriophyoidea). Fauna of New Zealand 5: 1-123.

Manson, D. C. M. and G. N. Oldfield. 1996. Biology and Ecology. 1.4.1. Life forms, deuterogyny, diapause and seasonal development, pp. 173-183. In: Lindquist, E. E., M. W. Sabelis and J. Bruin (Eds.). Eriophyoid Mites - Their Biology, Natural Enemies and Control. Elsevier, 790 pp.

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Acknowledgements

The New Zealand Plant & Food Research Institute Limited (Plant & Food Research) for permission to use photographs.

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Suggested Citation

Martin NA. 2019. Beech witches broom mite - Cymoptus waltheri. Interesting Insects and other Invertebrates. New Zealand Arthropod Factsheet Series Number 175. http://nzacfactsheets.landcareresearch.co.nz/Index.html. Date Accessed. ISSN 1179-643X.

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