HETERODERA AVENAE PDF

HETERODERA AVENAE PDF

The ecology and control of cereal cyst nematode in southern Australia is reviewed. The wide distribution of Heterodera avenae in Victoria and South Australia is. A key based on cyst and juvenile characters is given for identification of 12 valid Heterodera species in the H. avenae group. A compendium providing the most. World distribution of the cereal-cyst nematode is herein reviewed. It is suggested that Heterodera avenae originated in Europe and has been widely.

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Adult lemon-shaped, with prominent neck and vulval cone. For further details see Meagher and Brown This layer now known to consist of cosanoic acids and their calcium salts Brown et al.

Heavily infected plants have reduced tillering. These sources of resistance are not always efficient against all pathotypes. The wide distribution of Heterodera avenae in Victoria and South Australia is due largely to movement of cysts by wind during dust storms.

Go to distribution map Photomicrographs of diagnostically avdnae morphological features complement the compendium. Average cyst size 0. For details see Vez and Brown Cyst characters are most useful for separating species; these include shape, color, cyst wall pattern, fenestration, vulval slit length, and the posterior cone including presence or absence of bullae and underbridge.

Resistant plants allow penetration of second-stage juveniles but resist the development of females, thus inhibiting proliferation. She turns into a brown cyst by the end of plant growth season, as her external surface hardens and her internal parts die. No yellow phase as the maturing cyst changes from white to dark brown Franklin, Infested fields show uneven patches of stunted plants randomly distributed throughout the field. Spear well developed, with large, anteriorly flattened to concave basal knobs; its anterior tapering portion less than half its length.

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Leaf tips become yellow.

Heterodera avenae – Wikipedia

Go to Nemaplex Main Menu. Subcrystalline layer consipcuous, sloughing off as the dark brown cyst is formed. Lip region rounded, offset, with annules. Integrated Taxonomic Information System. Hemizonion indistinct, 6 to 7 annules behind excretory pore. The bacterial parasites Pasteuria penetrans and Pasteuria sp.

Economic considerations set limits to crop rotation because wheat is often more profitable than other crops and therefore this option is unattractive. Return to Heteroderidae Menu. Heterodera avenae Wollenweber Crop rotation is effective – this species declines more rapidly in the absence of a host than either G. Many efficient sources of resistance to cereal cyst nematode are present in various species and cultivars of Hordeum, Avena, Triticum, Secale and Triticale see Rivoal and Cook, and are widely used in western Europe and in Australia to control H.

The fungus Rhizoctonia solani frequently is associated with the nematode in a disease complex in wheat, and disease symptoms are most severe on lighter or well structured soils. Lip region annulated, with 6 confluent lips and a labial disc. Nematicides are effective, but not economical unless used for more than one crop. In Australia, chemical control was extensively used for instant results.

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Lateral fields disappearing near middle to tail.

In some cases individual roots have a knotted appearance with several females at each knot. Causes yellowing of plants; much branching and some swelling of roots may occur, particularly in oats and wheat. Natural control requires at least 5 years to build up antagonist populations for the control of H. Crop rotations which include periods of fallow, or of nonhost crop reduce population levels of H. All wheat varieties are susceptible but some cultivars do not support cyst formation. Body annules distinct, averaging 1.

National Center for Biotechnology InformationU. Esophageal glands ventral and ventro-lateral to intestine; dorsal with larger nucleus located closely behind esophago-intestinal junction, subventrals extending past the dorsal.

Journal List J Nematol v. This microscopic nematode exhibits sexual dimorphism. Excretory pore near esophago-intestinal junction. This allows better plant establishment before juvenile emergence and the host develops some kind of tolerance by the time of juvenile attack.

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Continuing to use www. Resistant plant cultivars are being developed in several breeding programs, e.

A key based on cyst and juvenile characters is given for identification of 12 valid Heterodera species in the H.