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Three cultivars of poinsettia (V14 Glory, Freedom Red, and Angelica White) were evaluated for induction of host resistance to Rhizoctonia stem rot in cuttings acquired from stock plants treated with binucleate Rhizoctonia (BNR) in a Pesta formulation. Resistance to stem rot in cuttings of V14 Glory was induced within 7 days of treatment with BNR while Freedom Red and Angelica White did not express...
Pyrrolnitrin production by Burkholderia cepacia strain 5.5B was closely related to suppression of stem rot of poinsettia caused by Rhizoctonia solani. Selected strains RR 13-1 and UV 19-4, which produced significantly less pyrrolnitrin than the parent strain 5.5B, lost the ability to control stem rot completely. Selected strain RR 21-2 produced the same level of pyrrolnitrin as strain 5.5B and was...
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