Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: April 15, 2005
Publication Date: August 1, 2005
Citation: Peres, N., Turechek, W. 2005. Pre and post-infection activity of pyraclostrobin for control of anthracnose fruit rot of strawberry caused by colletotrichum acutatum. Phytopathology. 95:S82
Anthracnose fruit rot, caused by Colletotrichum acutatum, is a serious problem for production of annual strawberries in central Florida and worldwide. The efficacy of pre- and post-infection applications of pyraclostrobin (Cabrio EC) was evaluated under field conditions over two seasons in Florida. Symptomatic fruit was used to inoculate plots under short (8 h) or long (24 h) wetting regimes. Cabrio applications were made 16 or 24 h prior to inoculation and 4, 8, or 24 h following inoculation. Anthracnose incidence in the untreated controls always exceeded the incidence in the treated plots and was higher on treatments subjected to a long wetting regime. In the first season with ‘Camarosa’, a moderately susceptible cultivar, post-infection treatments performed slightly better than the protective treatments. Disease incidence was similar with post-infection treatments with long or short wetting. In the second season, with strawberry ‘Festival’, a less susceptible cultivar, pre-and post-infection treatments performed similarly for the short wetting period. However, the protective treatment was better for the long wetting period. Results suggest that for short wetting events or less susceptible cultivars, fungicides may be applied after an infection event, but for longer wetting events or more highly susceptible cultivars, fungicides may have to be applied preventively.