Disease

Symptoms: This disease appears as a white powder coating over the leaf surface. This disease leads to foliage dryness. 
Advice: Irrigation by spraying can reduce the severity of the attack.

Symptoms: Present primarily in open-field crops, Nasonovia r. develops in early spring.
Advices: use resistant varieties.

Symptoms: They appear in the form of white carpophores which appear primarily on the lower surface of the leaves and cotyledons and light green to yellow spots with a somewhat angular shape.
Advices: Downy mildew is controlled through the use of resistant varieties and approved fungicides during growing cycle, but also by ensuring the production of healthy, unstressed plants from the moment they emerge.

Symptoms: Small brown spot surrounded by yellow

Advice: Avoid an overly dense population and excessive nitrogen fertilization; avoid watering at the end of the day or at night.