Abstract
AbstractTrichoderma viride, Aspergillus fumigatus, Penicillium javanicum, P. decumbens, and P. lilacinum constituted dominant fungus species in South African virgin soils which were present in much smaller numbers in adjacent citrus soils. The most dominant forms in old citrus soils were Fusarium solani, Fusarium spp. including F. oxysporum, Penicillium chermesinum, Pullularia pullulans, and Pyrenochaeta sp. Aspergillus niger, Mucor spp. and many others were present in about equal abundance in both old citrus and virgin soils. Phytophthora species were isolated from about a third of the old citrus soils but were not found in virgin soils. The citrus root nematode, Tylenchulus semipenetrans, was found in all but one of the old citrus soils examined but was not detected in the virgin soils. Nematodes isolated from both type soils included Trichodorus sp., Xiphinema sp., Rotylenchus sp., and numerous saprophytic species. Helicotylenchus sp. was noted in virgin soil only. The magnitude of the citrus replant problem in South Africa varied greatly but, in general, appeared to be less severe in well‐drained acid sandy soils containing relatively large numbers of the fungus, Trichoderma viride.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.