First report of spot lesion of wheat caused by Pyrenophora teres f. sp maculata observed in Argentina

COURETOT, L; CONSOLO, V.F.; CURTI, A; PERELLÓ, ANALÍA; URANGA, JUAN PABLO

CROP PROTECTION

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2019 vol. 122 p. 19 - 22

0261-2194

Pyrenophora tritici-repentis, causal agent of tan spot, is the species commonly associated with leaf spotting symptoms on wheat (Triticum aestivum L.) worldwide and in Argentina. On the other hand, P. teres is a major constraint on barley (Hordeum vulgare L.) production, however the pathogen has not been reported in association with wheat crop in Argentina. In 2018, following a routine survey of wheat fields, leaves showing symptoms compatible with those caused by Pyrenophora spp. were observed in the principal wheat production areas in Buenos Aires and Entre Rios Provinces of Argentina. The disease incidence varied from 30% to 80%. Symptomatic wheat plants were collected from production fields and spotted foliar tissue with symptoms was plated onto PDA 2% growth medium. The isolates were tentatively identified as putative Pyrenophora spp. based on its colonies and conidia characteristics. Given the possibility of confusion by similar characteristics between some Pyrenophora species that infect wheat plants, the aim of this work was to clarify the identity of the fungus infecting this crop.