Host-status of sixteen crops used in potato-based crop rotation systems against Meloidogyne javanica in South Africa  

DOI: 10.31830/2348-7542.2024.ROC-998    | Article Id: ROC-998 | Page : 79-85
Citation :- Host-status of sixteen crops used in potato-based crop rotation systems against Meloidogyne javanica in South Africa. Res. Crop. 25: 79-85
N. MATHEBULA, K. M. POFU AND P. W. MASHELA Phatu.mashela@ul.ac.za
Address : University of Limpopo, Department of Plant Production, Soil Science and Agricultural Engineering, Green Biotechnologies Research Centre of Excellence, Private Bag X1106, Sovenga, 0727, Republic of South Africa
Submitted Date : 12-07-2023
Accepted Date : 5-01-2024


Root-knot nematodes (Meloidogyne species) are the most important group of plant nematodes in potato-producing regions of South Africa. Prior to the withdrawal of synthetic chemical fumigant nematicides from the agrochemical markets, Meloidogyne species were viewed as a minor pest in potato-producing regions. Currently, it has been established that all potato cultivars are host to Meloidogyne species, with the preferred management option of the genus being the use of resistant crops. However, the host status of most crops used in potato-based crop rotations intended to manage nematode population densities of the genus had not been established. Globally, M. incognita is viewed as being more aggressive than M. javanica, whereas in South Africa the opposite is true. Therefore, the objective of the study was to determine whether the reproduction potential (RP) values of M. javanica on 16 crops used in potato crop rotation systems would be below unity. The experiment was conducted under greenhouse conditions at the University of Limpopo during autumn (February-April) 2022 and validated in spring (September-November) of the same year in South Africa. Treatments (16 crops) were laid out in a randomized complete block design, with six replications. The crops were inoculated with 250 eggs + second-stage juveniles (J2). At 56 days after inoculation, nematodes variables were collected and expressed as RP, which demonstrated that there were similarities and differences in RP of the 16 crops to infection by M. javanica, but with the values being below one in white maluti oats, tillage radish, forage sorghum, and jap radish. In conclusion, the four crops with RP values below one could be used in a potato-crop rotation system intended to manage the population densities of M. javanica.


Crop rotation host-status Meloidogyne javanica potato reproduction potential 


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