Comparison of fungicides and biological control agents for control of white rot, 2007-08

摘要

Two experiments were conducted in a Fresno County, CA commercial field infested with Sclerotium cepivorum (114 sclerotia/kg soil sampled 27 Sep 07). In an at-planting efficacy comparison, the activity of chemical/biological control agentsapplied in the planting trench was evaluated. The experimental design was a randomized complete block design with five replications. Materials compared were Endura 70WG 6.8 oz, Folicur 3.6F 20.5 fl oz with and without Watermaxx II 2 qt,Cannonball 50WP 8 oz with and without Watermaxx II 2 qt, Cannonball 50WP 4 oz, Moncut 70DF 2.86 lb, Glomes intrardices 30 lb, Contans 5.3WG 2, 4 and 8 lb and an untreated control. In a drip applied/at-planting efficacy comparison, the application of a fungicide or biological control agent in the planting trench and/or multiple fungicide applications through buried drip were evaluated. The experimental design of this trial was a five replication split block: Drip application programswere the main plot treatments and the at-planting applications were the sub plot treatments. The main plot treatments included a) Cannonball 50WP 8 oz applied 15 Feb and Folicur 3.6F 20.5 fl oz applied 7 Mar; b) Cannonball 50WP 8 ozapplied 15 Feb, Folicur 3.6F 20.5 fl oz applied 7 Mar, and Endura 70WG 6.8 oz applied 27 Mar; c) Folicur 3.6F 20.5 fl oz applied 15 Feb, Cannonball 50WP 8.0 oz applied 7 Mar and Endura 70WG 6.8 oz applied 27 Mar; and d) untreated control.The sub plot treatments were the at-planting applications, which included Cannonball 50WP 8.0 oz, Cannonball 50WP 8.0 oz + Botran 5F 3.2 qt, Contans WG 4 lb, Folicur 3.6F 20.5 fl oz, lbs and an untreated control. In both studies, garlic was plantedin two seed lines per 40 in. bed at a rate of 6.3 lb of seed per 30 ft plot on 20 Nov 07. All at-planting treatments were applied with a CO2-pressurized back pack sprayer in the equivalent of 25 gal/A in water except for G. intrardices, which was applied