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Zantedeschia elliotiana  `Flame' is a yellow calla with unique rust-colored blush, which is prone to a fungal/bacterial disease complex. Keeping calla rhizomes healthy and free of weakening by the most common fungal organisms  Fusarium  and  Rhizoctonia , which minimizes secondary invasion and toppling by  Erwinia carotova  soft rot, the most prevalent cause of calla loss in production. Rhizomes were treated by pre-plant bulb dip or post plant drench either with fungicide or bactericide alone or in combination. Pot loss totaled with plants showing a lack of vigor resulted in 8%, 12%, and 14% loss in the most effective three treatments, which were: 1) the common commercial pretreatment (Champ II, Dithane, and Agtrol) 2) control plants and 3) RootShield ( Trichoderma harzianum  T-22). Upper (leaf and stem) plant fresh weights corresponded having heaviest weights of 47.8, 53.4, and 51.1 g and lower (bulb and root) with 129.5, 135.8, and 127.7 g/plant. The three least-effective treatments were streptomycin sulfate, Kocide 101, and ammonium bicarbonate, which showed losses of 26%, 30%, and 36%. Fresh weights coincided at 30.5, 39.9, and 36.7 g/upper portion and 117.1, 116.5, and 113.1 g/lower portion, lightest of all treatments. The remaining four fungicides with streptomycin sulfate, in order of effectiveness at 16%, 16%, 18%, and 20% loss, were Consyst, Banrot, Medallion, and Heritage. When loss exceeded 20%, flower number/plant also declined. Because plant survival and vigor were not increased with trial chemicals, the common commercial pretreatment or no treatment at all is recommended. Continued research might reveal beneficial optimum rates for other chemicals.

442 Evaluation of Fungicide Treatments for Disease Protection of Zantedeschia elliotiana `Flame' in Florida Calla Lily Production