Pyricularia grisea and Bipolaris oryzae: a preliminary study on the occurrence of airborne spores in a rice field
Tóm tắt
Qualitative and quantitative analysis of fungalair spores in a rice field located around Pavia(North Italy) were made from 10th June to7th October 1996. Quantitative data wereanalyzed for the two rice pathogensPyricularia grisea (Cooke) Sacc. andBipolaris oryzae Shoem., causal organisms ofblast and brown spot. Results showed thatB. oryzae was detected at the end of June,reaching its peak in July. Brown spot symptomsin-field were detected six-seven days after theaforementioned peak. Pyricularia griseawas monitored later than Bipolaris as itwas detected for the first time on July21st, reaching its peaks on July 27thand August 6–7th. Field evaluation of thedisease showed the presence of blast startingfrom the first week of July. The knowledge of the atmospheric concentrationof Pyricularia and Bipolarisairborne spores together with a correctexamination of the crops can yield informationabout the risk of infection during thevegetative season, thus allowing for a moreaccurate use of fungicides on rice crops,according to the modern conception ofintegrated control.
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