Evaluation of peanut accessions resistance against Phoma arachidicola and relationship between disease-resistance and yield loss

doi:10.19802/j.issn.1007-9084.2020075

Abstract

Abstract: Peanut web blotch caused by Phoma arachidicola is a serious constraint in peanut production. A two-year field experiment was carried out to evaluate the resistance of 65 domestic peanut germplasms to P. arachidicola in 2018-2019. A 105/mL spore suspension was prepared from Wb2, a pathogenic strain of P. arachidicola collected from Laixi, Shandong Province, and sprayed on the surface of leaves for inoculation. The control area was sprayed with 50% fludioxonil WP for control of peanut web blotch. The result showed that, 8 accessions were resistant (R), accounting for 12.3%, 9 accessions were moderate resistant (MR), accounting for 13.8%, 37 accessions were susceptibility (S), accounting for 56.9%, and 11 accessions were high susceptibility (HS), accounting for 16.9%. The yield loss of accessions with different resistance was determined, and the results showed that the effect of Phoma arachidicola on peanut yield was significant, the yield loss rate increased with the decrease of disease resistance. This study provides resistant materials for peanut resistant breeding and provides a theoretical basis for yield loss assessment.

Key words: peanut (Arachis hypogaea L.), Phoma arachidicola, evaluation of resistance, yield loss

CLC Number:

中图分类号：S432.4

XU Man-lin, ZHANG Xia§, WU Ju-xiang, YU Jing, GUO Zhi-qing, LI Ying, XIE Hong-feng, TAN De-yun, ZHOU Ru-jun, CHI Yu-cheng. Evaluation of peanut accessions resistance against Phoma arachidicola and relationship between disease-resistance and yield loss[J]. CHINESE JOURNAL OF OIL CROP SCIENCES, 2021, 43(4): 731-.

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