Garden mums are most often produced outdoors and can be subject to weather conditions favorable for insects and diseases. A comprehensive rotation of proven products can help prevent infestations before they develop.
An agronomic program can provide a framework of how to position different products to control the primary insect and disease problems you may encounter on mums. Medallion® WDG and Mural® fungicides are important components for protection against Fusarium infections. Mural will also provide protection against Pythium and Rhizoctonia when applied as a drench, giving you the benefit of systemic protection inside the plant.
Troublesome Garden Mum Insects
Thrips, aphids and worms are common insect pests that can affect garden mums in production. Controlling thrips and aphids is especially important as it can prevent the spread of viruses. Thrips act as a vector for Impatiens Necrotic Spot Virus (INSV) and Tomato Spotted Wilt Virus (TSWV). Aphids can spread Chrysanthemum Virus B (CVB). As a broad-spectrum insecticide, Mainspring® GNL provides excellent control of thrips, aphids, worms and other insect pests on garden mums.
Common Mum Diseases
Root and stem diseases caused by Pythium and Fusarium spp. pathogens are likely to emerge under high temperatures and moist conditions. Roots can be compromised by repeated wetting and drying resulting in the development of wounds, which increase the risk of infection by these pathogens. Growing media with high soluble salts can cause root burn and make plants more susceptible to attack.
Frequent rain can spur infections by Pythium spp. Affected plants will appear pale green and show signs of wilt during the warm times of the day, recovering in the evening. As the disease progresses, plants become stunted and fail to recover.
Fusarium occurs more frequently when plants are stressed, so attention to proper growing practices and environmental conditions is essential. Symptoms tend to show in late summer, but infections can begin as early as July, so protection during this time is critical. The pathogen often invades one side of the vascular system, resulting in plants that show signs of a one-sided wilt. Foliage will appear lighter in color and wilt from the bottom up.
Plants are often infected simultaneously by both pathogens. Treatments of Mural and Medallion WDG fungicides can help protect against these diseases.
A Programmatic Approach
Plant protection products are essential when the environmental conditions are conducive to pest development or when symptoms are first observed on mums. Application frequency should be based on the activity of the product, current environmental conditions, pest lifecycle and level of pressure. Additionally, it is critical to proactively prevent resistance by rotating products with different modes of action.
Agronomic Program for 12-16 Week Crops
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