Powdery mildew can be a serious disease of field peas grown in Victoria. It occurs sporadically when warm humid conditions favour its growth late in the season. Seed from infected pods can be discoloured and less palatable, which reduces its market value.
Infected plants are covered with a white powdery film, and severely infected foliage is blue-white in colour, and the tissue below these infected areas may turn purple figures 1 to 3.
All aerial parts of the plant may become infected resulting in withering of the whole plant. Severe pod infection can cause a grey-brown discolouration of the seeds. These seeds have an objectionable flavour that lowers the quality of the grain.
The disease may also be seed-borne, but this source of infection is least important. Under favourable conditions, the disease may completely colonise a plant in five to six days. Once a few plants become infected, the disease rapidly spreads to adjacent areas.
However, heavy rainfall is not favourable for the disease as it will actually wash spores off plants. Night time dews are sufficient for the disease to develop. Severe infections can reduce yield by 10—20 per cent. Powdery mildew is most prevalent late in the season.
Powdery Mildew of Peas (With Diagram)
Crops sown late are more likely to be affected by powdery mildew than early sown crops. Severe pod infection can lead to poor seed quality. For further information on disease ratings refer to the Victorian Pulse Disease Guide.
The use of disease-free seed is recommended. The use of clean seed will minimise the possibility of disease provided the land has not been cropped to peas for several years.
Seed treatments can be beneficial, and are recommended for districts where powdery mildew frequently occurs.
Field Pea Diseases Review: Powdery Mildew: (06/02/16)
Leave a four-year break between growing field pea crops in the same paddock. Control volunteer field peas, which can harbour disease. Avoid sowing field pea crops adjacent to last season's stubble.
Incorporate or burn infected pea stubble soon after harvest where practicable.
Powdery mildew of pea pdf download
Follow the recommended sowing rates from your agronomist and remember that sowing rates may vary between varieties. For the optimal sowing time for your district refer to the Victorian Winter Crop Summary. Monitor crops from flowering onwards for signs of powdery mildew. If the disease is present, the application of a foliar spray may be warranted.
Powdery mildew of vegetable pea
Fungicides for powdery mildew have limited systemic activity, and will not protect the new growth following spraying.
Detailed information on each of the pulse diseases can be obtained from:. National Variety Trials. Grain Legume Handbook. Victorian Winter Crop Summary. Victorian Pulse Disease Guide.
Pulse Seed Treatments and Foliar Fungicides. Following changes to the Victorian Government structure, the content on this site is in transition. There may be references to previous departments, these are being updated. Please call to clarify any specific information.
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★ How to: Treat Powdery White Mildew (A Complete Step by Step Guide)
Powdery Mildew of Field Peas Powdery mildew can be a serious disease of field peas grown in Victoria. What to look for Figure 1.
Powdery Mildew of Field Peas
Powdery mildew on the leaf and stipule of a field pea Infected plants are covered with a white powdery film, and severely infected foliage is blue-white in colour, and the tissue below these infected areas may turn purple figures 1 to 3. Disease Cycle Figure 2.
Figure 3. Powdery mildew resistant plant beside a badly infected plant Economic Importance Severe infections can reduce yield by 10—20 per cent.
Management Variety Growing a resistant variety is the most effective means of controlling powdery mildew. Seed selection The use of disease-free seed is recommended. Seed treatment Seed treatments can be beneficial, and are recommended for districts where powdery mildew frequently occurs.
Paddock selection Leave a four-year break between growing field pea crops in the same paddock. Sowing rate Follow the recommended sowing rates from your agronomist and remember that sowing rates may vary between varieties. Time of sowing Plan to sow at the optimum time for your district. Foliar fungicides Monitor crops from flowering onwards for signs of powdery mildew.
Fungicides need to be applied prior to disease development to be most effective.
Good plant coverage with the fungicides is essential. Depending on disease pressure, foliage is protected for about 14 days. Before using any chemicals check that they are currently registered for use. Harvest Plan to harvest as early as possible to minimise disease on seed and pod shattering. Back to top. Agriculture Facebook.
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