Factors associated with stem base and root diseases of New Zealand wheat and barley crops

The incidence of stem base and root diseases of cereals in New Zealand was measured over a 3-year period to determine their relationships with soil and crop management factors. Samples were collected from 142 New Zealand wheat and barley crops during the milky ripe stage of crop growth and the propo...

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Bibliographic Details
Published in:Australasian plant pathology 2006-01, Vol.35 (4), p.391-400
Main Authors: Cromey, M G, Parkes, R A, Fraser, P M
Format: Article
Language:English
Subjects:
Barley
Cereal crops
Cereals
Clover
Crop diseases
Crop growth
Crop management
crop rotations
Crops
Crown rot
Eyespot
Fusarium
Fusarium avenaceum
Gaeumannomyces graminis
Hordeum vulgare
irrigation
Microdochium nivale
Planting
Rhizoctonia cerealis
Soil management
Stems
Take-all disease
Tillers
Triticum aestivum
Wheat
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Summary:The incidence of stem base and root diseases of cereals in New Zealand was measured over a 3-year period to determine their relationships with soil and crop management factors. Samples were collected from 142 New Zealand wheat and barley crops during the milky ripe stage of crop growth and the proportion of tillers affected by stem base and root diseases in each crop was assessed. Take-all (caused by Gaeumannomyces graminis ), and sharp eyespot (caused by Rhizoctonia cerealis ) were common, whereas crown rot (caused by Fusarium spp.) was present at only low levels and eyespot (caused by Tapesia spp.) was not recorded. Incidence of both take-all and sharp eyespot was greater in wheat crops (mean of 8.3 and 12.6% tillers infected, respectively) than in barley (1.7 and 4.4%). Previous crop was the main factor associated with take-all in wheat crops. Incidence was highest where wheat followed wheat (mean of 29.3% tillers infected), and higher after barley, grass or clover than after other break crops. Although take-all incidence was high in most successive wheat crops, incidence was low (
ISSN:0815-3191
1448-6032
DOI:10.1071/AP06032