Cyst Nematodes by Alan R. Stone (auth.), F. Lamberti, C. E. Taylor (eds.)

By Alan R. Stone (auth.), F. Lamberti, C. E. Taylor (eds.)

The cyst nematodes are a tremendous staff of plant pathogens of monetary value in lots of international locations during the international. huge yield losses were attributed to cyst nematodes attacking potatoes, sugar beet, soybean and cereals. as a result of protecting cyst that's shaped, which encloses the eggs, they pose specified difficulties of their keep an eye on and in addition in fighting their distribution in soil from infested components. there was a lot study on many elements of the biology of cyst nematodes and the big variety of courses are testimony to their significance as crop pests and of the curiosity of nematologists within the crew. however, they proceed to pose difficulties due to the complexity in their phylogeny and taxonomy and there's nonetheless a lot to be investigated on their biology, really with these points which relate to bettering the effectiveness of keep watch over. in lots of respects the biology of some of the cyst nematode species is the same, even if with adaptations because of diverse interactions with hosts and geographical position. hence, study on anybody species has normal applicability and this is often really so with reference to review of keep watch over measures, or to the technique of soil sampling for the review of populations sooner than becoming crops.

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Cyst Nematodes

The cyst nematodes are a tremendous team of plant pathogens of financial value in lots of international locations during the global. substantial yield losses were attributed to cyst nematodes attacking potatoes, sugar beet, soybean and cereals. as a result protecting cyst that's shaped, which encloses the eggs, they pose certain difficulties of their keep an eye on and in addition in combating their distribution in soil from infested parts.

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Schachtii grown in aseptic culture developed SCL, indicating that a fungus is not necessary for its presence. Because of its variability and brief existence, the SCL cannot at present be regarded as of diagnostic value. However, once it is known for certain which species have the SCL, and its origin, nature and chemical composition for each species have been established, then it may prove to be of significant value in identification and indicating relationships of species. Cyst Wall Structure The cyst wall is variable in thickness, and consists of two basic layers, the exo-and endo-cuticles (ferris and Siegel, 1957); Weiser, 1953).

G. H. schachtii, the vagina or its remnants persist in the vulval cone and ridges or folds give it a striated appearance, like a sheaf of grain, and because of this Taylor (1957) called it "sheaf-like organ". Proximally, the vagina is thought to thicken to form the "basal bulb" (Cooper, 1955) or "cervix" (Thorne, 1961) which although initially hollow, later becomes solid forming two arms extending across the vulval cone and becoming linked to the cyst wall; this is the underbridge. The arms lie beneath and parallel to the vulval bridge and their ends are forked or furcated.

They are variable in size, shape, and in length/width ratio and this variation occurs within and between species. As pointed out by Hesling (1978) egg shape is unreliable in species identification but the morphometrics might be useful in some species as supplemental or confirmatory characters. The egg shell in most species is hyaline and without visible markings; however, three Cactodera species are known to have egg shells with punctations. These markings were useful in diagnosis of two species by Golden and Raski (1977) and recently Baldwin and Bell (1985) described a third species with punctations on the egg shell.

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