Disease · sunflower

Rust of sunflower

Puccinia helianthi SchweinitzEPPO code PUCCHE

Ukrainian: іржа соняшнику · Інститут захисту рослин НААН
English: rust of sunflower · European and Mediterranean Plant Protection Organization

When and with what to treat

When to look: The first (aecial) stage appears on seedlings after germination, especially on volunteer plants: on the cotyledons, stems and leaves. Uredopustules usually appear before flowering (sometimes 1–2 weeks after the first stage), and teliopustules at the end of flowering or the start of ripening.
The first, slight manifestation of the disease is observed at the stages from budding to flowering. It spreads intensively at the end of the growing season, during seed ripening.
The first sunflower disease assessment is carried out after emergence, before thinning. Record plants that have died from white rot and grey rot, plants infected with rust, and healthy plants.
During the third assessment, at flowering, rust is recorded along with other diseases.
How to count: Determine the percentage of seedlings killed by rots and the percentage infected with rust. Examine 50 consecutive plants at each of 10 places along a diagonal or along two parallel lines, 5 m in from the field edge.
Rust severity on the leaves is scored on a four-point scale. Score 0: healthy plants. Score 1: single lesions on the leaves, or a small number of them that are easy to count.
Rust severity on the leaves is assessed on the whole plant, not on each leaf tier separately. The plant is given the score that matches the largest number of its leaves.

Registered against this organism by a ministry order · 17

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No rate and no spray timing here: both come from the label and the register.

Favourable conditions: In the second half of the growing season, the disease is favoured by moderately warm, sufficiently moist weather and the presence of droplet moisture.

Every fact rests on a quote from its source, and each quote was checked against the page it is printed on.

When and with what to treat

When to look: The first (aecial) stage appears on seedlings after germination, especially on volunteer plants: on the cotyledons, stems and leaves. Uredopustules usually appear before flowering (sometimes 1–2 weeks after the first stage), and teliopustules at the end of flowering or the start of ripening.
The first, slight manifestation of the disease is observed at the stages from budding to flowering. It spreads intensively at the end of the growing season, during seed ripening.
The first sunflower disease assessment is carried out after emergence, before thinning. Record plants that have died from white rot and grey rot, plants infected with rust, and healthy plants.
During the third assessment, at flowering, rust is recorded along with other diseases.
How to count: Determine the percentage of seedlings killed by rots and the percentage infected with rust. Examine 50 consecutive plants at each of 10 places along a diagonal or along two parallel lines, 5 m in from the field edge.
Rust severity on the leaves is scored on a four-point scale. Score 0: healthy plants. Score 1: single lesions on the leaves, or a small number of them that are easy to count.
Rust severity on the leaves is assessed on the whole plant, not on each leaf tier separately. The plant is given the score that matches the largest number of its leaves.

Registered against this organism by a ministry order · 17

Show all · 17

No rate and no spray timing here: both come from the label and the register.