Evaluation of commercial corn hybrids against fungal diseases, in the central-south of the province of Córdoba

Abstract

Every year the market for corn hybrids for grain production offers new materials whose behavior in the field against diseases and adaptation to different environments are not known. The objective of the work was to quantify the intensity of common rust and corn blight in different commercial hybrids in the central-southern zone of the province of Córdoba. During the 2020/2021 cycle, a corn hybrid trial was carried out in Río Cuarto (Córdoba) with a BCA design, with two repetitions and 10 rows per hybrid, quantifying rust and blight by incidence, severity and ABCPE at four moments of the cycle. of the crop. The incidence of rust was 20%-93% and no hybrid reached the level of economic damage, although six groups were discriminated according to severity. Regarding the ABCPE for common rust, only one genotype (LT 723 VT3Pro) differed from the rest, who presented the maximum severity value. For corn blight, the incidence was 20%-68% and a single hybrid reached 5.5% severity, differentiating two groups of hybrids according to this parameter, while for ABCPE only two materials (P1815 VYHR and Tob 767) differed significantly from the rest. It is concluded that in late sowings and with good environmental conditions, all the evaluated hybrids presented a very good behavior to corn rust and a good tolerance to blight, with different behavior of the corn hybrids available in the market regarding both diseases.

ARK CAICYT: http://id.caicyt.gov.ar/ark:/s26182734/jc4znwjgz