Diagnosing autumn-winter drought in narrow-leafed lupins

Early drought may affect germination and early growth. Water stressed seedlings are more severely affected by other constraints and may have induced nutrient deficiencies.

Patchy canola germination restricted to water-gaining places
Leaflets folded along mid-vein giving a narrow look

What to look for

    Paddock

  • Patchy germination that may vary across the paddock according to seeding depth, soil type or other factors that affect soil moisture infiltration and storage.

    Plant

  • Dull coloured plants with leaflets folded in giving them a narrow look.
  • Plants that have wilted and died.

What else could it be

Condition Similarities Differences
Diagnosing water repellence Patchy germination Only in water repellent soil.
Diagnosing rhizoctonia hypocotyl rot in narrow-leafed lupins Patchy germination, stunted , dying seedlings. Red-brown hypocotyl lesions.
Diagnosing rhizoctonia ZG6 in narrow-leafed lupins Patchy germination, stunted , dying seedlings. Red-brown hypocotyl and root lesions.
Diagnosing pleiochaeta root rot in narrow-leafed lupins Patchy germination, stunted, dying seedlings. Dark-brown hypocotyl and root lesions.

How can it be monitored?

Soil test
Soil test
  • Unless the problem is obviously due to drought, dig a hole and examine the soil profile for:
  • water content
  • soil texture
  • soil pH
  • water repellence
Page last updated: Tuesday, 20 January 2015 - 10:30am