Hostas & the Anthracnose Pest

These perennials develop in climates where the temperature drops to or beneath cooling them throughout their period, although hostas may lend a contact to shady areas. Unfortunately, times that are great, foggy can also inspire the development of fungi in backyard soil that promote anthracnose. To keep these crops healthy, fast handle and careful lifestyle will help the hosta fanatic.

The Hosta

Hostas are seen as an eyecatching leaves, some with supper platter-sized heart-styles, some brightly teardrop, with smaller -styles. A mattress of hostas produces interest that accents rather than backyard and house characteristics. Hybrids, several bred for moderate climates, characteristic several flower stems with purple, lavender or white flowers. Gold- and variegated- types need sunlight to produce finest colour, but blue-leaved types where the material that provides them their colour builds a layer prosper in shade. Hostas develop leaf canopies that offer efficient weed control. Their moist habitat encourages fungus growth.


Anthracnose seems in hostas, first tan or brown spots that finally open as the leaf tissue dies and dries, darken and enlarge. The “pest” is really a complex of illnesses with several fungal brokers. Hostas usually fall victim to fungi in the Colletotrichum family. Fungi finds circumstances in moist, nevertheless, component-to-completely shaded locations–just the locations where hostas prosper. No hostas are immune to anthracnose, but some light colored kinds, including Tokudama hybrids are particularly vulnerable.

Cultural Controls

Hostas planted in well-drained soil using a mulch to keep moisture in the floor aids helps maintain soil-borne fungus from traveling to the foliage. Widely- crops enable better blood supply, discouraging fungus development. Water is got by morning irrigation under leaves to the soil compared to watering, which deposits water splashes up fungus spores in the soil on leaf surfaces or, worse. Shade -lovers like blue hostas gain from morning sunshine to dew-drenched leaves and help keep the soil or mulch dry.


Once anthracnose gains a foothold on a leaf, its harm can’t be undone. Doubling-down on controls and pruning impacted leaves –implementing air-circulation, correct watering and mulch –can slow its development. Fungicides containing chlorothalonil, iprodione, mancozeb and thiophanate-methyl WOn’t quit fungus once proven, but may handle the fungus before hostas start development in the spring, when used to the floor. Fortunately, the plant does not be infected by anthracnose completely; eliminating afflicted foliage and floor clutter that is natural in the fall stops the re-appearance of signs in springtime progress.

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