Treatment against powdery mildew (Erysiphe cichoracearum) on cucumber plants with low toxic compounds

allium sativum biological control biopesticide biopesticides control de enfermedades cucumis sativus cultivos de invernadero disease control equisetum arvense erysiphe cichoracearum extractos vegetales farmyard manure fumier greenhouse crops horse manure lutte biologique mildews mildiou oidium plant extracts plante de serre spraying toxicidad toxicity