Print version ISSN 0006-8705
SANTINI, Ademir et al. Fungicidal action of azocyclotin acaricide on comon bean anthracnose. Bragantia [online]. 2005, vol.64, n.2, pp. 241-248. ISSN 0006-8705. http://dx.doi.org/10.1590/S0006-87052005000200011.
The control effect of azocyclotin acaricide was tested to common bean anthracnose pathogen, Colletotrichum lindemuthianum, in vitro, seedlings and in field conditions. The treatments in vitro were: 1) Test; 2) Azocyclotin (AZ)- 1 AZ-1 mg.L-1; 3) Triphenil sthanic hydroxide (THE)-1 mg L-1; 4) AZ-10 mg L-1; 5) THE-10 mg L-1; 6) AZ-100 mg L-1 and 7) THE-100 mg L-1 and in vivo treatments were: 1) Test; 2) AZ applyed 24 hours before inoculation (AZ-24); 3)THE-24; 4) AZ-48; 5)THE-48; 6) AZ-72; 7) THE-72; 8) AZ-96; 9) THE-96; 10) AZ-120; 11) THE-120; 12) AZ-144, and 13) THE-144. Azocyclotin was evaluated at 125 g.100 L-1 of water and fenthin hydroxide at 41,25 g a.i.100 L-1. The experiments were set up as a completely randomized design, with 5 repetitions. In field conditions, the treatments (g ha-1 a.i.) included: 1) tebuconazole + fentin hydroxide-100 + 200; 2) tebuconazole + trifloxystrobin-40 + 100; 3) trifloxystrobin-125; 4) tebuconazole + azocyclotin-100 + 500; 5) azocyclotin - 500 and 6) without chemical. The experimental design was done using randomized blocks, with 4 replicates. The mycelial growth was determined through reading the fungi radial growth in BDA culture media. In vivo and in field conditions, evaluations were made with a scale of 1 to 9, where 1 = without symptoms and 9 = equal or more than 25% of foliar area with anthracnose symptoms. In vitro test, the treatment 7 presented the most effective mycelial development inhibition. Azocyclotin and triphenil sthanic hydroxide controlled dry bean anthracnose when applied until 144 hours before inoculation. A new field record was the control of bean anthracnose with azocyclotin acaricide, with effect on both to angular leaf spot and alternaria leaf spot. It was concluded that azocyclotin acaricide can control dry bean anthracnose with similar efficiency as fentin hydroxide.
Keywords : Phaseolus vulgaris L.; Colletotrichum lindemuthianum; chemical control.