Yesterday, 14 February 2019, we detected the very first signs of Asian Rust in the soybean indicator crop for the season. This indicator crop is planted annually in October, two weeks ahead of the earliest commercial planting date in the area to get the very first expressions of rust for the season. Rust is very effectively controlled with fungicide, but spraying needs to occur before symptoms develop. The sentinel system is effective in limiting the number of sprays required to control soybean rust, by delaying the first spray until we are certain we have all three elements of the disease triangle. Rust spores, which blow in to the production area from endemic regions, the right night temperature and leaf wetness conditions and a susceptible host. If you are in a rust prone area and have not yet started your spraying programme, this is your signal to contact your chemical agent. Our colleagues at Corteva Agriscience™ highly recommend Acanto® Plus 280 SC. Contact Schalk Geldenhuys on 082 609 7403 for further enquiries.
Soybean rust requires quite specific conditions for infection. Optimum temperatures of between 20-25°C combined with leaf wetness for 6 hours. Rust spores are photosensitive, so it requires these conditions during the night, before infection will occur. Despite our impressions of unseasonal weather, this alert more often than not, gets sent out in the middle of February every year.
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