search
for
 About Bioline  All Journals  Testimonials  Membership  News  Donations


Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 75, No. 1, 2015, pp. 78-84
Bioline Code: cj15011
Full paper language: English
Document type: Study
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 75, No. 1, 2015, pp. 78-84

 en Distribution and prevalence of crown rot pathogens affecting wheat crops in southern Chile
Moya-Elizondo, Ernesto; Arismendi, Nolberto; Paz Castro, María & Doussoulin, Herman

Abstract

Crown rot pathogens are associated with higher losses for wheat crop farmers, but information about the distribution and prevalence of these pathogens in Chile is inadequate. Distribution and prevalence of wheat ( Triticum aestivum check for this species in other resources L.) crown rot pathogens were examined in a survey of 48 commercial fields from December 2011 to February 2012 in southern Chile. These fields were located between Collipulli (37º56’00” S; 72°26’39” W) and Purranque (40º50’30” S; 73°22’03” W). Severity of crown rot disease was determined through visual assessment of the first internode of 20 tillers obtained from each field. Incidence of crown rot pathogens per field was determined by plating the 20 tillers on Petri plates with 20% potato dextrose agar amended with lactic acid (aPDA) medium. Resulting fungal colonies from monoxenic culture were identified by morphological or molecular-assisted identification. Severity of crown rot varied between 11.3% and 80% for individual fields. Culture plate analysis showed 72.2% of stems were infected with some fungus. Fusarium avenaceum check for this species in other resources , F. graminearum check for this species in other resources , and F. culmorum check for this species in other resources , pathogens associated with Fusarium crown rot disease were isolated from 13.5% of tillers. Gaeumannomyces graminis check for this species in other resources , causal agent of take-all disease in cereals, was isolated from 11.1% of culms. Phaeosphaeria check for this species in other resources sp., an endophyte and possibly a non-pathogenic fungus, was isolated from 13.9% of tillers. Pathogenic fungi such as Rhizoctonia check for this species in other resources spp. and Microdochium nivale check for this species in other resources , other saprophyte, and several unidentified non-sporulating fungi were isolated at frequencies lower than 3% of the total. Fusarium crown rot and take-all were the most prevalent and distributed crown rot diseases present in wheat crops in southern Chile.

Keywords
Furasium crown rot; soilborne diseases survey; take-all; Triticum aestivum; wheat diseases

 
© Copyright 2015 - Chilean Journal of Agricultural Research
Alternative site location: http://www.inia.cl

Home Faq Resources Email Bioline
© Bioline International, 1989 - 2017, Site last up-dated on 16-Oct-2017.
Site created and maintained by the Reference Center on Environmental Information, CRIA, Brazil
System hosted by the Internet Data Center of Rede Nacional de Ensino e Pesquisa, RNP, Brazil