Ke. Conway et al., INTEGRATION OF BIOLOGICAL AND CHEMICAL CONTROLS FOR RHIZOCTONIA AERIAL BLIGHT AND ROOT-ROT OF ROSEMARY, Plant disease, 81(7), 1997, pp. 795-798
Aerial blight, caused by Rhizoctonia solani AG-4, was identified as a
major disease of greenhouse mist-produced rosemary cuttings. An isolat
e of the biocontrol fungus Laetisaria arvalis, selected for tolerance
to the experimental fungicide CGA 173506, was used as an amendment to
potting soil. Combined treatment of rosemary with L. arvalis and a fol
iar spray of the fungicide at one-half the recommended rate reduced di
sease more than treatment with either the fungus or fungicide alone. S
imilar synergism was not observed for combinations of Trichoderma harz
ianum as a soil amendment and a foliar spray of the fungicide iprodion
e applied at the labeled rate.