Effect of boscalid on postharvest decay of strawberry caused by Botrytis cinerea and Rhizopus stolonifer.

摘要

In Chile, gray mold (Botrytis cinerea) and leak (Rhizopus stolonifer) are the major storage diseases of strawberry (Fragaria x ananassa) that considerably reduce yields and quality, limiting its international commercialization. The effect of preharvest fungicide treatments and postharvest treatments against storage decay was studied. Incidence of B. cinerea and R. stolonifer was significantly lower on var. Camarosa strawberry fruits treated with boscalid or boscalid + pyraclostrobin between blossom and harvest. Similarly, incidence of B. cinerea and R. stolonifer significantly decreased at 5 and 20 degrees C after immersion treatments with boscalid (600-700 mg/l) or cyprodinil + fludioxonil (371 + 250 mg/l). These postharvest treatments provided 5 and 15 days protection against these fungi when strawberry fruits were stored at 20 and 5 degrees C, respectively. Fenhexamid (750 mg/l) arrested B. cinerea, but it was ineffective against R. stolonifer. Variable results were obtained with iprodione (750 mg/l). Fungicide treatments had no adverse effect on TSS contents, titrable acidity or firmness. Only boscalid + pyraclostrobin affected the external colour of the treated fruits. Results suggest that fungicide treatments using new reduced-risk fungicides could be useful to extend strawberry shelf life for over a 15 day period. However, further research is needed to establish a commercial recommendation.