Lily diseases / RHS Gardening (2024)

FAQs

Lily diseases / RHS Gardening? ›

Diseases that attack lilies can lead to unsightly flowers or foliage. They may also cause rotting in the bulbs. Lilies may be affected by; Lily disease – caused by the fungal leaf pathogen Botrytis elliptica.

Botrytis blight, Botrytis spp. This is the most widespread and common disease of lilies. Symptoms appear as oval or circular spots which are initially reddish-brown and develop pale centers and purplish margins. These spots may run together and rot the entire leaf.

If your lilies look worse for wear, there's a good chance they've fallen victim to one of a trio of fungal and viral infections which attack both leaves and bulbs. Look out for brown spots or yellowing and streaking of the leaves, rotting bulbs and shrivelled blooms and act quickly to prevent the spread of disease.

Lily leaf beetle larvae covered in a "fecal shield" The lily leaf beetle larvae, or grubs, cause the most damage. Hundreds of larvae may hatch at one time, and they begin eating immediately. Though the leaves are their preferred food, they will also devour buds, flowers and stems.

Over watering, under watering, planting too deep, and fungal diseases can all cause leaf decline in newly emerging foliage or existing foliage.

Leaf Streak: Daylily leaf streak is caused by the fungus Aureobasidium microstictum. Symptoms are elongated yellow streaks along the leaf mid-vein followed by browning or spots on the infected leaves with yellow borders. These symptoms usually develop from the leaf tip downward.

Early signs of lily toxicity in cats include decreased activity level, drooling, vomiting, and loss of appetite. These symptoms start 0 to 12 hours after ingestion.

Incorrect Light Conditions. Peace lilies are tropical plants that thrive in bright, indirect light. Too much direct sunlight can scorch their leaves and flowers, causing them to turn brown or develop brown tips. On the other hand, insufficient light can stress the plant and lead to yellow leaves and poor flower health.

But sometimes, the leaves can turn yellow or brown, or they may also start to curl or droop. These peace lily leaf issues can occur for many reasons, including water-related mistakes, incorrect light exposure, and more.

Signs of overwatering include yellow leaves, brown leaf tips, and a generally droopy, unhealthy looking plant. To fix this, allow the peace lily plant to dry out before the next watering.

Do coffee grounds help lilies? ›

Peace lilies can benefit from coffee grounds as they are a rich source of nutrients for the plant. Additionally, they prefer acidic soil, and coffee grounds add acidity to the soil. To get the maximum benefits from the grounds, use them as compost or liquid fertilizer.

Protect your plants from Lily Beetles by spraying with Grazers Lily Beetle Spray. Simply spray onto the foliage of the lilies and fritillaries in the spring as new growth emerges and continue to spray throughout the growing season.

As lilacs mature, they can grow leggy and overgrown, with little foliage towards the bottom of the shrub. When this happens it may be necessary for a complete rejuvenation by pruning them to within 12 inches of the ground. This should be done in late winter when the shrubs are dormant.

As we shared earlier, peace lilies prefer medium, indirect sunlight. If they're exposed to too much direct sunlight or even too little, they will often develop yellow leaves. Overwatering or under-watering can also commonly cause leaves to wilt and turn yellow or brown around the edges.

Improper Watering

Overwatering causes root rot, leading to the yellowing and dying of lower leaves. If the soil feels crumbly and dusty, the Easter lily received too little water. Feel the soil before watering the Easter lily to avoid these water issues. Water when 50% of the soil volume is dry.

Common pests of daylilies include aphids, spider mites, thrips, and slugs and snails.

A bad bulb will have a soft, nearly squishy interior and mold or fungus somewhere on the exterior. Discard such bulbs immediately, along with any adjacent bulbs that could have been infected.