Chrysanthemum White Rust: Good Management Prevents Major Losses
by Elizabeth Lamb, Margery Daughtrey, Margaret Kelly
Early symptoms on top of leaf
Chrysanthemum white rust (CWR) is a fungal disease of chrysanthemums caused by Pucciniahoriana that can cause severe damage, including complete crop loss due to direct effects of the disease or to quarantine procedures. Pot mums, garden mums and mums grown for cut flowers are all susceptible to the disease. The characteristic symptoms are small white to yellow spots on the upper leaf surface corresponding to pinkish to white pustules on the lower leaf surface. Early infestations may be hard to identify. Train workers how to identify CWR so that any outbreaks can be identified early before they spread through the crop. The disease is very contagious within a mum planting, and can be spread to other plantings by the wind during rainy weather.
For more information on identifying and preventing chrysanthemum white rust, additional references are available.
Early symptoms on bottom of leaf
Preventative treatments for CWR that are labeled in NY
Prevention is the best method of control. Buy cuttings from a reliable source. Inspect them when they come in and regularly thereafter for symptoms of white rust. Water with drip tapes or individual emitters if possible to avoid splashing spread via overhead irrigation. Do not keep any decorative plantings of chrysanthemum on your property from year to year.
Infected plants may not show symptoms until the plants are in the proper environment. Cool weather (40-73 F), high humidity (over 75%) and wet foliage for at least 5 hours promote the development of CWR. If temperatures stay above 73 F and no rainfall is predicted, no treatment is necessary. If rainfall is predicted for a 24-hour or longer period and the temperatures are expected to be near or below 73 F, preventative fungicide treatment is prudent even on crops that appear healthy.
Many weather websites provide temperature and precipitation forecasts based on your zipcode or a nearby airport.
More advanced symptoms on bottom of leaf
When using rust fungicides preventively, rotate among active ingredients and FRAC codes. Use contact (e.g. chlorothalonil and mancozeb) as well as systemic (strobilurin and DMI) materials within the rotation. Follow all label precautions regarding whether treatments are recommended for plants in flower.
For additional information on fungicides for rust management, check the Cornell Guide for the Integrated Management of Greenhouse Floral Crops or the Cornell Pest management Guide for the Production ad Maintenance of Herbaceous Perennials.
Remember to check the label for specifics of use.
More advanced symptoms on top of leaf
Because chrysanthemum white rust is a Federally regulated pest, you must contact your NYS Horticulture Inspector if you suspect your plants are infected. For contact information for your local inspector, call the Division of Plant Industry at 518 457-2087.
This article offers excellent guidance on managing chrysanthemum white rust and preventing significant crop losses. The practical tips and strategies shared here are invaluable for growers looking to protect their crops and maintain healthy yields. Effective disease management like this is crucial for ensuring long-term success in farming. The TAFCOP Portal offers comprehensive and precise information about TAFCOP, along with the latest news and updates related to it. This makes the TAFCOP Portal an essential resource for anyone seeking to stay informed about technological advancements and regulatory changes in the telecom sector.
Chrysanthemum White Rust is a serious issue, and this article does a great job explaining how to prevent it. The tips on early identification and using preventive fungicide treatments are super helpful. I didn’t realize how quickly it could spread through the crop, especially in cool, wet conditions. Definitely keeping an eye on my plants now!
Telegram has become an essential tool for farmers in Hong Kong to share updates about Chrysanthemum White Rust (CWR). By creating dedicated channels for growers, they can quickly share photos of early symptoms, such as the white to yellow spots on leaves, and discuss possible treatments. This real-time information exchange can help prevent widespread infestations in the region.
Telegram channels can play a vital role in organizing training sessions for Hong Kong chrysanthemum growers. These channels can host videos and guides on identifying early signs of Chrysanthemum White Rust, ensuring workers are well-informed and can act quickly to protect crops from devastating losses.
The article is very detailed and has a lot of useful information. Thank you for sharing!
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Great info, thanks for sharing! 👍 I didn’t realize how quickly chrysanthemum white rust could spread. The tips on prevention, especially checking cuttings and using drip irrigation, are super useful for anyone growing mums.
This is really helpful. The weather-based treatment advice makes a lot of sense — I’ll definitely keep an eye on humidity and temperature when managing my plants. Prevention really does sound like the key here.
This is a very strong resource — great job!
Train staff to spot the tiny upper-leaf yellow/white spots and corresponding lower-surface pustules, and act quickly with isolation and fungicide protocols—label your reports clearly (e.g., is freddy’s gluten free so samples and photos stay organized. Rapid containment, monitoring nearby plantings, and strict hygiene are essential to stop wind-driven spread during rainy periods.