Botanic Garden >> Gardening > >> Question and Answer >> Plant Diseases

Powdery Mildew on Rosemary: Organic Controls

Rosemary in Dry Eastern WA Has Powdery Mildew

Afternoon/evening sun, growing well, foliage dry when watered. Wants organic remedies.

Expert Options

Organic controls: (1) dusting sulfur (watch temp—hot causes burn), (2) baking-soda-related products (Milstop, Kaligreen, Bonide Remedy, Greencure), (3) copper materials. Clean up old/dropped leaves where fungus overwinters.

Plant Diseases: Powdery Mildew on Indoor Rosemary: Edible-Safe Treatment; Controlling Apple Powdery Mildew: Cultural and Chemical Strategies; Comprehensive Guide to Powdery Mildew on Roses; Powdery Mildew on Sarracenia 'Judith Hindle': Systemic Fungicide + Hygiene; Yucca's Natural White Film: Not Powdery Mildew; Jade Plant Powdery Mildew: Baking Soda Spray Treatment; Powdery Mildew on New Squash Plant: Return It, Don't Treat; Powdery Mildew on Houseplants: Identification, Prevention & Treatment; Powdery Mildew: Identification, Prevention, and Fungicide Management; Powdery Mildew: Identification, Conditions, and Management

Garden Articles

Powdery Mildew on Tulip Tree: Identification and Management

Powdery Mildew on Magnolia & Hydrangea: Fungicide Options

Powdery Mildew on New Roses: Copper Treatment & Fertilizing Timing

Downy Mildew: Cool-Weather Obligate Parasites of Ornamentals

Choosing Mildew-Resistant Phlox for Hassle-Free Perennials

Powdery Mildew on Euonymus: Identification and Management

Powdery Mildew Control: Identification, Resistant Varieties, and Treatments

Plants

Managing Powdery Mildew on Mature Lilac Hedge

Snake Plant Decline: Overwatering and Scale

Balsam Plant Leaf Spots: Powdery Mildew Management

Powdery Mildew on Lilacs and Peonies: Common, Manageable

Quaking Aspen Powdery Mildew: Identification and Large-Tree Management

Garden Fungus Problems: Powdery Mildew, Black Spot, and Mushrooms in Mulch

Powdery Mildew on Jasmine: Three-Spray Fungicide Schedule