ISHS Acta Horticulturae 704: X International Workshop on Fireblight
EFFICACY OF BIOAGENTS AND CHEMICALS AGAINST PEAR SHOOT BLIGHT |
| Authors: | C. Bazzi, E. Biondi, R. Berardi, A. Brunelli |
| Keywords: | Erwinia amylovora, fire blight, Pyrus communis, biological control, chemical control |
| Abstract:
Outdoor experiments were carried out during spring and summer of 2003 and 2004 to test the efficacy of biological control agents and chemicals against fire blight. Pseudomonas spp. strains IPV-BO 4027C, IPV-BO G19, A506 and the biopreparations BS-F4 and Serenade (both based on Bacillus subtilis strains) were applied on growing shoots of pear scions cv. Abbé Fétel 24 h before and after wound inoculation with a local Erwinia amylovora strain. During three weeks before inoculation, the growth retardant Regalis (prohexadione-Ca, 10% WG) was applied three times at 7 to 9 day intervals; during two weeks before inoculation, Bion (acibenzolar-S-methyl 50 WG), Aliette (fosetil-Al 80% WG) and the mineral powder Myco-Sin were applied twice at 7 day intervals; copper compounds were applied at different concentrations 24 h before inoculation, as were water and streptomycin sulphate (controls). In 2004, strain IPV-BO 4027C, BS-F4 and Serenade were applied a few hours after application of the copper oxychloride (Cu 0.5 g/l). In 2003, the growth retardant Regalis, the copper peptidate Peptiram 5 and BS-F4 were very active in reducing shoot blight incidence and, referred to the positive control, gave the highest relative protection (approx. 96%, 85% and 82%, respectively). In 2004, the levels of relative protection given by Regalis and by both the bioagents A506 and IPV-BO 4027C were approx. 52% and 44%, respectively. In a laboratory experiment on detached pear flowers, IPV-BO G19 and A506 provided essentially the same high level of relative protection (86%). | |
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