Journal article
Effect of cropping system on composition of the Rhizoctonia populations recovered from canola and lupin in a winter rainfall region of South Africa
European journal of plant pathology, Vol.131(2), pp.305-316
10/2011
Handle:
https://hdl.handle.net/2376/116143
Abstract
Rhizoctonia spp. anastomosis groups (AGs) associated with canola and lupin in the southern and western production areas of the Western Cape province of South Africa were recovered during the 2006 and 2007 growing seasons and identified using sequence analyses of the rDNA internal transcribed spacer regions. The effect of crop rotation systems and tillage practices on the recovery of Rhizoctonia spp. was evaluated at Tygerhoek (southern Cape, Riviersonderend) and Langgewens (western Cape, Moorreesburg) experimental farms. Isolations were conducted from canola planted after barley, medic/clover mixture and wheat, and lupin planted after barley and wheat, with sampling at the seedling, mid-season and seedpod growth stages. In the 2006 study, 93.5% of the Rhizoctonia isolates recovered were binucleate and 6.5% multinucleate; in 2007, 72.8% were binucleate and 27.2% were multinucleate. The most abundant AGs within the population recovered included A, Bo, I and K, among binucleate isolates and 2-1, 2-2 and 11 among multinucleate isolates. Crop rotation sequence, tillage and plant growth stage at sampling all affected the incidence of recovery of Rhizoctonia, but certain effects were site-specific. The binucleate group was more frequently isolated from lupin and the multinucleate group from canola. AG-2-1 was only isolated from canola and AG-11 only from lupin. This study showed that important Rhizoctonia AGs such as AG-2-1, 2-2 and 11 occur in both the southern and the western production areas of the Western Cape province and that crop rotation consistently influences the incidence and composition of the Rhizoctonia community recovered from the cropping system.
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Details
- Title
- Effect of cropping system on composition of the Rhizoctonia populations recovered from canola and lupin in a winter rainfall region of South Africa
- Creators
- Sandra Lamprecht - Agricultural Research Council-Plant Protection Research Institute Private Bag X5017 Stellenbosch 7599 South AfricaYared Tewoldemedhin - Agricultural Research Council-Plant Protection Research Institute Private Bag X5017 Stellenbosch 7599 South AfricaMark Hardy - Western Cape Department of Agriculture Private Bag X1 Elsenburg 7607 South AfricaFrikkie Calitz - Agricultural Research Council-Biometry Unit PO Box 8783 Pretoria 0001 South AfricaMark Mazzola - United States Department of Agriculture-Agricultural Research Service Tree Fruit Research Laboratory Wenatchee WA 98801 USA
- Publication Details
- European journal of plant pathology, Vol.131(2), pp.305-316
- Academic Unit
- Plant Pathology, Department of
- Publisher
- Springer Netherlands; Dordrecht
- Identifiers
- 99900547982601842
- Language
- English
- Resource Type
- Journal article