3/18/2024 0 Comments Flower pots color by numberThe disease is often difficult to diagnose because superficial small red or pink patches may appear on the outside of healthy bulbs. Red spots or blotches that develop into elongated cankers with red borders may develop on the base of the flower stalks and emerging leaves. However, this disease is not usually fatal to the plant. Red blotch ( Stagonospora curtissi) is a fungus disease that may affect both the appearance and the health of amaryllis plants. Poorly drained soil or soil that is constantly wet (overwatered) may also attract fungus gnats, a type of fruit fly. The use of insecticides is generally ineffective. What to do: Because control is difficult, it is best to destroy any infested bulbs as soon as the narcissus bulb fly is identified. The exterior of the bulb may appear normal but will reveal rotting tissue when pressed. The foliage of infested plants may become wilted, yellow and distorted and the plant will eventually die. The maggot larvae feed in the outer scales of the bulb and eventually work their way into the interior of the bulb. The narcissus bulb fly ( Merodon spp.) may lay its eggs in the bulbs of amaryllis plants that are placed outdoors for the summer. Careful inspection when purchasing bulbs accompanied by proper care will prevent most insect infestations as well as diseases.
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