Phytoptus avellanae: Difference between revisions
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| Hazel Big Bud Gall | |
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| A Big Bud Gall on Hazel | |
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| Species: | P. avellanae
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| Binomial name | |
| Phytoptus avellanae Nalepa 1889
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Phytoptus avellanae is a acarine gall-mite species inducing big bud galls of up to 10mm across, sometimes slightly open, on the buds of Hazel (Corylus avellana) and on Filbert (Corylus maxima).[1] Synonyms include Phytocoptella avellanae, Eriophyes avellanae, Calycophthora avellanae, Phytoptus coryli, Phytoptus pseudogallarum, and Acarus pseudogallarum.[2] The mites are white, about 0.3 mm long, with numerous tergites and sternites.[3] Two forms of P. avellanae exist, a gall causer and a vagrant form that has a more complex life-cycle and does not form galls.[4]
Common names include - DE: Haselnussgallmilbe, Haselnuss-Knospengallmilbe, ES: Badoc del avellano, FR: Phytopte du noisetier, IT: Eriofide del nocciolo, GB: Filbert bud mite, Hazelnut gall mite, TR: Fýndýk kozalak akarý.[3]
Galls
Hazel big bud galls are generally common, resembling the big bud gall (Cecidophyopsis ribis)[5] on currants (Ribes sps.), develop as a chemically induced distortion of the expanding leaf buds or female flowers on hazel shrubs, caused by the mite Phytoptus avellanae, several hundred of which can live in a single gall within the 20-40 scale leaves.[6] The inner scale-leaves become thickened and distorted, developing a covering of hairs, in amongst which the mites live. Galled buds appear light green at first and turn brown later in the year.[6] If affected the leaves or female flowers fail to develop as a result of the feeding by the gall-mites.[2]
Vagrant form
The vagrant form of P. avellanae feeds not only on big buds, but also on vegetative and generative parts such as leaves, male and female flowers and completes its life cycle even in the absence of big buds.[4]
Life cycle
In early autumn the gall-mites leave the now reddish-brown bud and migrate to a young bud or commonly a newly formed male catkin where they remain inactive between the flower scales until late winter when the catkins start to elongate. At this stage they feed upon the sap and this causes the scales to swell and open up, the stamens distort and eventually disappear. The female mites leave the buds or catkins in April and seek new buds or female flowers to invade and lay eggs in. The nymphs develop and change into adults in June-July before invading the new buds of the current year's shoots.[2][3]
Parasitoids and inquilines
A predatory midge, Arthrocnodax coyligallarum, and a chalcid parasite, Tetrastichus eriophyes are recorded on P. avellanae. An inquiline is the mite Eriophyes vermiformis that otherwise causes crinkling of hazel leaves.[2] Kampimodromus aberrans (Oudemans), is another predator of the big bud mite.[7]
Agricultural significance
This pest causes important reductions in the harvest, especiaaly as the buds destined to give female flowers and fruit seem to be preferentially invaded.[3]
See also
External links
References
- ^ Margaret Redfern & Peter Shirley (2002). British Plant Galls. Identification of galls on plants & fungi. Shrewsbury: Field Studies Council. p. 314. ISBN 1-85153-214-5.
- ^ a b c d Arnold Darlington (1968). The Pocket Encyclopaedia of Plant Galls in colour. Poole: Blandford Press. pp. 146–148. ISBN 0-7137-0748-8.
- ^ a b c d "Phytoptus avellanae, Cecidophyopsis vermiformis". Retrieved June 26, 2012.
- ^ a b "LIFE CYCLES OF PHYTOPTUS AVELLANAE NAL. AND CECIDOPHYOPSIS VERMIFORMIS NAL. (ERIOPHYOIDEA: ACARINA)". ISHS Acta Horticulturae 445: IV International Symposium on Hazelnut. Retrieved June 26, 2012.
{{cite web}}: Cite uses deprecated parameter|authors=(help) - ^ Margaret Redfern & Peter Shirley (2002). British Plant Galls. Identification of galls on plants & fungi. Shrewsbury: Field Studies Council. p. 421. ISBN 1-85153-214-5.
- ^ a b F. B. Stubbs (1986). Provisional Keys to British Plant Galls. Hawes. p. 23. ISBN 0-9511582-0-1.
{{cite book}}: Text "British Plant Gall Society" ignored (help)CS1 maint: location missing publisher (link) - ^ Ozman-Sullivan SK. "Life history of Kampimodromus aberrans as a predator of Phytoptus avellanae (Acari: Phytoseiidae, Phytoptidae)". Exp Appl Acarol. 2006;38(1):15-23. Retrieved June 26, 2012.