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Surveys of fields in New Zealand for Gaeumannomyces graminis var. tritici (Ggt) soil DNA inoculum levels have found low soil Ggt levels prior to the sowing of a first wheat where fields are preceded by a non-Ggt host. First wheats in these fields generally have low levels of take-all (take-all index <20 out of a maximum value of 100). An exception to this was a first-year wheat field (T1) that had been preceded by a crop of canola (non-Ggt host), but had a take-all index >20 and more than 70% of plants infected with take-all. Post-harvest investigation of the field found rhizomes of Elytrigia repens (couch) with dark lesions present over large areas in the field. A glasshouse bioassay of couch rhizomes either pre-treated with glyphosate (T1 RU) or not (T1 RU) was undertaken, using a control of Ggt-free rhizomes sourced from glasshouse-grown plants. The bioassay showed that T1 couch caused severe take-all and therefore was a probable source of Ggt inoculum during the preceding season. The RU and RU rhizomes did not produce significantly different levels of take-all infection from each other.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Gaeumannomyces graminis var tritici infection of couch association with takeall in a firstyear wheat