For steward: tpg recommendations on member comments on terms and consistency for draft diagnostic protocol

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International Plant Protection Convention

Compiled comments on terms and consistency for 2004-017

Agenda items: 4.12


2004-017: Draft Annex to ISPM 27:2006 – Ditylenchus dipsaci and Ditylenchus destructor

The TPG reviewed member comments from member consultation 2014 that were related to terms and to consistency in the use of terms. Lines were added for additional comments by the TPG. TPG comments are numbered as TPG 1, TGP 2, etc.

The comments that did not relate to terms and consistency were not answered and are marked as “not TPG”







TPG Recommendation



The TPG noted that the footnotes on commercial brands, normally included for every brand names (as per SC Nov 2008 decision), are not in this standard (e.g. in paragraphs 149, 157, 170, 183). The Secretariat Lead for the TPDP explained that the TPDP had proposed at their July 2014 meeting to have a general disclaimer in the text instead of several footnotes largely repeating the same text. The TPG noted that the protocol may need to be adjusted depending on whether the SC May 2015 agrees with this approach.



The describing authority should be indicated in the title

Consistency with other DPs




D. dipsacisensu lato (s.l.), or stem nematode, attacks more than 1 200 species of wild and cultivated plants. Many weeds and grasses are hosts for the nematode and may play an important role in its survival in the absence of cultivated plants. Morphologial, biochemical, molecular and karyological analyses of different populations and races of the D. dipsaci s.l. have suggested that it is a species complex of at least 30 host races, with limited host ranges. Jeszke et al. (2013) divided this complex into two groups, the first containing diploid populations characterized by their “normal” size and named D. dipsaci sensu stricto (s.s.). This group comprises most of the populations recorded so far. The second group is polyploidal and currently comprises Ditylenchus gigasVovlas et al., Troccoli, Palomares-Rius, De Luca, Liebanas, Landa, Subbotin and Castillo, 2011 (the “giant race” of D. dipsaci parasitizing Vicia faba); D. weischeri Chizhov et al., Borisov and Subbotin, 2010 (parasitizing Cirscium arvense (creeping thistle)); and three undescribed Ditylenchus spp. called D, E and F, which are associated with plant species of the Fabaceae, Asteraceae and Plantaginaceae respectively (Jeszke et al., 2013). Of all these species only D. dipsaci s.s. and its morphologically larger variant D. gigas are plant pests of economic importance. This protocol therefore covers D. dipsaci s.s. and presents D. gigas separately.This protocol includes information to distinguish D. dipsaci s.s. and D. gigas.

1. and 2. Clearer. The other authors are given in the two references (paragraphs [279] and [221]). 3. A misspelled name (Cirsium) 4.Last but one sentence: "plant pests" to be replaced by "pests" (cf. ISPM 5). 5. We question whether s. l. and s.s. should be in italic (latin) 6. Last sentence modified for clarity.

EPPO, European Union, Georgia, Serbia

Support “et al.”, correction of misspelling, and “pests” instead of “plant pests”(use of defined term)

6. not TPG




Other common hosts are Ipomoea batatas (sweet potato), bulbous iris (hybrids and selections derived from Iris xiphium and Irus xiphioides), Taraxacum officinale (dandelion), Humulus lupulus (hop), Tulipa spp. (tulip), Leopoldia comosa (grape hyacinth), Hyacinthus orientalis (hyacinth), Gladiolus spp. (gladiolus), Dahlia spp. (dahlia), Coronilla varia and Anthyllis vulneraria (vetch), Beta vulgaris (sugar beet), Calendula officinalis (marigold), Daucus carota (carrot), Petroselinum crispum (parsley) and Trifolium spp. (red, white and alsike clover) (Sturhan and Brzeski, 1991). In the absence of higher plants, D. destructor reproduces readily on the mycelia of about 70 species of fungi and it is known to destroy the hyphae of cultivated mushroom (Sturhan and Brzeski, 1991). The species is able to survive dessication and low temperatures, but does not form nematode wool as does D. dipsaci (Kühn, 1857) Filipjev, 1936. This species, however, overwinters in eggs, which makes eggs more vital in D. destructor than in D. dipsaci. D. destructor in seed potatoes and flower bulbs is on the list of quarantinea regulated pests of in many countries and organizations (Sturhan and Brzeski, 1991). D. destructor was reported on Arachis hypogaea (groundnut/peanut) in South Africa, but these records are now considered to be a separate species, Ditylenchus africanus Wendt, Swart, Vrain and Webster, 1995, which is morphologically and morphometrically close to D. destructor.

1. It is better to call it grape hyacinth to prevent confusion with the ordinary hyacinth, which has also been added. 2. It's the countries who determine the lists of regulated pests.

EPPO, European Union, Georgia, Serbia

Support the use of specific common name for L. comosa

Addition of H. orientalis: not TPG

Last comment: not TPG.

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