ABSTRACT
In a study conducted in the field during the 2020/21 season, a relationship was established between the time of capturing the first Phakopsora pahyrhizi uredospores disseminated through the air and the detection of Asian rust symptoms/signs in a soybean area. To capture spores, a Smart Agri spore collector was used. The first three P. pachyrhizi spores were collected on January 28. Rust symptoms/signs were assessed weekly based on leaflet incidence, the most sensitive method, until 100% was reached. Uredospore detection occurred 12 days before the onset of rust symptoms/signs in the monitored area. Rust occurrence can be predicted by uredospore capturing in the monitored area. The time to start fungicide spraying, aiming at rust control, can be based on the detection of the first P. pachyrhizi spores.
Keywords
spore collector; airborne dissemination; inoculum source;
Glycine max
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