![]() ![]() Chlorothalonil (Daconil 2787) is widely available for homeowner use and will help to control botrytis. Fungicide sprays, when environmental conditions are favorable, will help reduce levels of this disease. They show discolored petals which wilt and fall. Leaves develop zonate, brown leaf lesions which develop a grayish brown mass of fungal spores. Botrytis is favored under cool, moist conditions or where plants are watered frequently. Make sure and destroy infected plants and plant parts this fall.Īnother common disease of geranium is a fungal disease known as botrytis leaf spot or botrytis blossom blight. There is no chemical cure for bacterial leaf spot. Severly infected plants should be removed. Leaves infected with bacterial leaf spot should be removed as soon as it is noticed. In severe cases, the stem will possess black stem cankers killing the upper portion of the stem. As the disease moves through the plant, the lower leaves wilt and yellow. Large numbers of spots will occur on a single leaf, these will coalesce killing a large portion of the leaf which will then drop off. Disease symptoms include small (pinhead size), circular or irregular, brown, sunken spots on older or lower leaves. This disease is caused by the bacterium Xanthomonas pelargonii and is especially prevalent in warm, wet weather where plants are grown in crowded conditions. One disease being seen this season is bacterial leaf spot. Like all plants, geraniums have their share of disease and insect problems. It also improves plant appearance as well as reducing the chance for disease. This will prevent seeds from forming and force the plant into producing additional blooms. Remove the spent flowerheads as they begin to deteriorate. To keep flowers coming continuously throughout the summer, regular deadheading is necessary. They like moist, well- drained soils and prefer a cool root zone. Some of the named series, such as 'Elite' and 'Orbit', are known especially for compact growth which is desirable for containers and bedding displays. Today, many varieties are available from seed. In past years, most varieties were grown vegetatively from cuttings. Flowers may be single, double, or semi-double. Flowers are packed densely on umbels rising above the plant foliage. From the true orange flower of 'Orange Appeal' to the fluorescent shade of 'Orbit Violet' there is surely a color to coordinate with any landscape plan. A wide variety of flower and foliage colors are available. The geranium, Pelargonium xhortorum, is widely grown in flower beds, containers, and hanging baskets.
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