Powdery mildew on some vegetables

Powdery mildew on vegetable crops from the family Apiaceae – attacks all above-ground parts of crops from the family Apiaceae – carrots, parsley, celery, dill. It is particularly dangerous for flowering stems in seed production stands. Under severe attack there is a real risk that the seeds will not ripen. Two pathogens cause powdery mildew on species from this family – Erysiphe umbelliferatum and Erysiphe heraclei.

Powdery mildew on leafy vegetables – spinach (causal agents Oidiopsis haplophylli, Leveillula spp., Uncinula spp.), lettuce and salad greens (causal agent Golvinomyces cichoracearum)

Powdery mildew on okra (causal agent Erysiphe cichoracearum)

Control:

• Growing resistant varieties;
• Sowing in well-ventilated locations;
• Optimal crop density;
• Balanced fertilization;
• Control of environmental conditions through regular ventilation and installation of ventilation equipment;
• Systematic monitoring of the crop for early detection of infection (inspection of leaves on both sides);
• Treatment with plant protection products – preferably preventive ones, alternating products with different modes of action to prevent resistance development;
• Suitable plant protection products – with active substances such as sulfur, myclobutanil, strobilurins, neem oil extract, phytofungicides and vegetable oils.