11 January 2024, US: Soybean rust, a fungal disease caused by the pathogen Phakopsora pachyrhizi, poses a significant threat to soybean crops globally.
The disease primarily affects the leaves of the soybean plant, leading to pustule formation, yellowing, and premature defoliation. Soybean rust can disrupt the plant’s photosynthetic process by damaging the leaf tissue. This damage can lead to reduced energy production, stunted growth, and delayed maturity.
It can also impact the stems and pods, causing discoloration and potentially reducing pod and seed counts. Additionally, the disease can weaken the plant’s overall health, increasing its susceptibility to other diseases and pests.
This post will outline:
- How to identify soybean rust
- Geographic impact of soybean rust
- Timing of soybean rust
- How to manage soybean rust
How to Identify Soybean Rust
Identifying soybean rust early is crucial to control its spread and minimize yield loss. It usually appears as small, raised pustules on the underside of soybean leaves. Initially, these pustules are gray or tan, darkening as the disease progresses. Corresponding yellow spots may appear on the upper surface of the leaves.
The disease can also lead to premature defoliation, delayed maturity, and reduced pod and seed counts. In severe instances, it can result in significant yield loss.
A hand lens or microscope may be necessary to see the pustules clearly. Laboratory tests can also confirm the presence of the Phakopsora pachyrhizi pathogen.
Geographic Impact of Soybean Rust
Soybean rust is widespread in numerous soybean-growing regions, including parts of Asia, Africa, Australia, and the Americas. It thrives in warm, humid conditions and can spread rapidly in such environments.
Timing of Soybean Rust
Soybean rust can appear at any stage of the growing season, but it is most common during the flowering and pod-setting stages. Late-season infections may not cause significant yield loss but can contribute to the disease’s spread in subsequent years.
How to Manage Soybean Rust
For managing soybean rust, consider Willowood Propicon 3.6EC and Willowood Teb 45DF. Willowood Propicon 3.6EC is a fungicide containing Propiconazole.
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