Abstract
Isolates ofRhizoctonia solani were adapted in vitro to grow on a medium amended with tolclofos-methyl at a concentration 500 times that which initially almost completely inhibited growth.
Acquired resistance was retained after five transfers on a fungicide-free medium. Pathogenicity of resistant isolates was not reduced, but their growth rates on PDA were significantly lower than those of the original isolates. Recovery of the resistant isolates was not improved on a selective medium amended with tolclofos-methyl.
Samenvatting
Na overenting op een medium dat tolchlofos-methyl bevatte, raakten enkele isolaten vanRhizoctonia solani gewend aan 500 maal de dosis die oorspronkelijk bijna alle groei verhinderde.
Resistente isolaten vanR. solani bleven minder gevoelig voor tolchlofos-methyl na vijf overentingen op een medium zonder het fungicide. De pathogeniteit van resistente isolaten was niet verminderd, maar hun groeisnelheid op PDA was significant vertraagd vergeleken bij die van de oorspronkelijke isolaten. Isolatie van de resistente stammen werd niet verbeterd op een selectief medium waaraan tolchlofos-methyl was toegevoegd.
Similar content being viewed by others
References
Abdalla, M.H., 1975. Sectoring of fungal colonies induced by low concentrations of fernasan. Mycopathologia 56: 39–40.
Dekker, J., 1973. Selectivity of and resistance against systemic fungicides. EPPO Bull. 3(10): 47–57.
Dekker, J., 1976. Acquired resistance to fungicides. Ann. Rev. Phytopath. 14: 405–428.
Dekker, J., 1977. The fungicide-resistance problem. Neth. J. Pl. Path. 83 (Suppl. 1): 159–167.
Dekker, J., 1982. Fungicide resistance and its impact on tropical plant diseases. In: Proceedings of the International Conference on Plant Protection in the Tropics, Kuala Lumpur, Malaysia, Malaysian Plant Protection society, p. 69–79.
Elsaid, H.M. & Sinclair, J.B., 1964. Adapted tolerance to organic fungicides by isolates ofRhizoctonia solani from seedling cotton. Phytopathology 54: 518–522.
Galindo, J.J., 1979. Morphological variability, virulence and anastomosis grouping of isolates ofRhizoctonia solani Kuehn associated with bean roots and soils in New York. MS Thesis, Cornell Univ., Ithaca, NY, 73 pp.
Grover, R.K. & Chopra, B.L., 1970. Adaptation ofRhizoctona species to two oxathiin compounds and manifestations of the adapted isolates. Acta phytopath. Acad. Sci. Hung. 5: 113–121.
Kataria, H.R. & Grover, R.K., 1974. Adaptation ofRhizoctonia solani to systemic and nonsystemic fungitoxicants. Z. Pfl. Krankh. Pfl. Schutz 81: 472–478.
Kloepper, J.W., Schroth, M.N. & Miller, T.D., 1980. Effects of rhizosphere colonization by plant growth-promoting rhizobacteria on potato plant development and yield. Phytopathology 70: 1078–1082.
Ko, W. & Hora, F.K., 1971. A selective medium for the quantitative determination ofRhizoctonia solani in soil. Phytopathology 61: 707–710.
Meyer, R.W. & Parmeter, J.R., Jr., 1968. Changes in chemical tolerance associated with heterokaryosis inThanatephorus cucumeris. Phytopathology 58: 472–475.
Ohtsuki, S. & Fujinami, A., 1982. Rizolex (tolclofos-methyl). Japan Pesticide Information 41: 21–25.
Papavizas, G.C., Lewis, J.A. & Abd-El Moity, T.H., 1982. Evaluation of new biotypes ofTrichoderma harzianum for tolerance to benomyl and enhanced biocontrol capabilities. Phytopathology 72: 126–132.
Shatla, M.N. & Sinclair, J.B., 1963. Tolerance to pentachloronitrobenzene among cotton isolates ofRhizoctonia solani. Phytopathology 53: 1407–1411.
Stack, J.P. & Millar, R.L., 1982. Sensitivity ofPhytophthora megasperma and otherPhytophthora species to metalaxyl. Phytopathology 72: 266 (Abstr.).
Vanachter, A. & van wambeke, E., 1977. Mutations ofFusarium oxysporum andRhizoctonia solani by TCMTB. Neth. J. Pl. Path. 83 (Suppl. 1): 261–266.
Weinhold, A.R., 1977. Population ofRhizoctonia solani in agricultural soils determined by a screening procedure. Phytopathology 67: 566–569.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Van Bruggen, A.H.C., Arneson, P.A. Resistance in Rhizoctonia solani to tolclofos-methyl. Netherlands Journal of Plant Pathology 90, 95–106 (1984). https://doi.org/10.1007/BF01994514
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01994514