Influence of Soil Fumigation for Citrus Replants on the Fungus Population of the Soil1
- J. P. Martin,
- R. C. Baines and
- J. O. Ervin2
A study was made of the influence of soil fumigation, prior to replanting citrus trees, on the fungus population of the soil. Fumigants used included D-D, CS2, chloropicrin, ethylene dibromide, and Vapam. It was found, in general, that after marked reduction or near destruction of the fungus populations of the soils, especially of the subsoils, fungi again became established but represented relatively few species in comparison with those in untreated soils. Numbers remained relatively low in some soils or attained higher magnitudes than in the nonfumigated soils in other plots. Additional species returned with time, but even after 2 or 3 years the populations were still markedly affected in many soils. Trichoderma viride was stimulated by fumigation treatment much more often than other species. Other fungi returning as dominant species in one or more soils included: Acrostalagmus sp., Aspergillus nidulans, Aspergillus niger, Aspergillus ochraceus, Aspergillus sydowi, Fusarium solani, Fusarium sp., Gliocladium penicilloides, Myrothecium verrucaria, Penicillium nigricans, Penicillium restrictum, Penicillium vinaceum, Pullularia pullulans, Pyrenochaeta sp., Sclerotium sp., Sepedonium chrysospermum, Spicaria sp., Stemphylium consortiale, Torula sp., and Volutella sp.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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