Powdery mildew in sunflowers

A picture of a leaf suffering from powdery mildew in a sunflower

Characteristic symptoms

Disease symptoms appear in the form of gray spots on the upper surface of old leaves, but the leaf blade retains its green color. As the disease progresses, the affected areas expand and the spots fuse together and cover a large area of the affected part. At the end of the disease stages, the fruiting bodies of the fungus appear in black color on the areas. Infected.

Powdery mildew in sunflowers - Plant World

Powdery mildew

Causative agent: the fungus Erysiphe cichoracearum

Symptoms and damages

The incidence of the disease is high, which may reach 100%, and the severity of the infection reaches 84%. However, this disease does not cause economic losses, as losses do not exceed 3-5 %, due to the appearance of the disease at the end of the season after the formation and maturation of the disc is complete.

Symptoms of the infection appear on the upper surface in the form of white spots with a powdery appearance, which are offset by yellow spots on the lower surface. However, the rest of the leaf blade retains its green color. When environmental conditions are present, especially high temperature and humidity, the mealy growth covers all surfaces of the leaves, and the fungus’s stamens appear black on the surface. Affected areas. Which leads to its fall.

Comments about the disease

The emergence and spread of this disease is appropriate for warm weather, high temperature, and relative humidity around 80%, and it appears at the end of the plant’s life and near harvest.

Prevention and treatment

  1. Reduce the number of plants per unit area for good air circulation.
  2. Remove and destroy plant debris at the end of the season.
  3. Planting in open areas that receive full sunlight most of the day.

 Chemical control

Where one of the following pesticides is used:

  • Tilt at a rate of 15/20 cm/100 water
  • Amistar at a rate of 50/100 liters of water
  • Amistar Top at a rate of 60 cm/100 liters of water

The plants are sprayed in two successive cycles with a time difference of 16 days, followed by spraying micronized sulfur mixed with Bendazim at a rate of 500 grams of sulfur with 100 grams of Bendazim.

Control

  • Spraying plants with micronized sulfur at a rate of 3 g/liter of water.
  • Rubigan 4% at a rate of 0.5 cm3/liter of water.
  • Dumark 10% mM at a rate of 0.5 cm3/liter of water.
  • Orteva 25% AC at a rate of 0.6 cm3/liter of water.
  • Daconil 50% AC at a rate of 1-1.5 cm3/liter of water.
  • Infiltrate 20% at a rate of 1 cm3/liter of water.
  • Belcoat 40% MQB at a rate of 0.5 g/liter of water.
  • Avocan 40% at a rate of 0.5 cm3/liter of water.
  • Folkure 25% at a rate of 1 cm3/liter of water.
  • Bailiton 25% MQB at a rate of 1-1.5 g/L of water.
  • Bifidan 25% mM at a rate of 1 cm3/liter of water.
  • Calexin 75% mM at a rate of 0.5 cm3/liter of water.
  • Flint 50% WG 2 g/kg seeds

Powdery mildew in sunflowers - Plant World

the reviewer

https://agricultureegypt.com/EncyclopediaList/4/1080/2190/2775/__%D8%A7%D9%84%D8%A7%D9%85%D8%B1%D8%A7%D8%B6_%D8%A7%D9%84%D9%81%D8%B7%D8%B1%D9%8A%D8%A9_%D8%A7%D9%84%D8%A8%D9%8A%D8%A7%D8%B6_%D8%A7%D9%84%D8%AF%D9%82%D9%8A%D9%82%D9%89

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