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Crazy Top

by Claudia Ringler
Published: Last Updated on
crazy top

Crazy top is a plant disease caused by the fungus Sclerotinia sclerotiorum. It affects a wide range of plants, including vegetables, fruits, and field crops. The disease is characterized by the appearance of white, cottony growth on the leaves, stems, and flowers of infected plants, which can eventually lead to wilting and death.

The history of crazy top can be traced back to the 19th century, when it was first observed in Europe and North America. Since then, it has spread to many countries around the world, with particularly high incidence rates in areas with cool, moist growing conditions.

Examples of plants affected by crazy top include lettuce, beans, peas, sunflowers, and canola. The disease can cause significant yield losses, particularly in crops grown for seed production.

The global status of crazy top is difficult to determine, as it varies widely depending on the region and the specific crop. However, it is considered a major threat to many economically important crops, and has significant economic and ecological impacts.

Scientific evidence suggests that the fungus that causes crazy top can survive in the soil for many years, and can infect plants through their roots or through wounds in the plant tissue. The disease can also be spread by water, wind, and insects.


The importance of controlling crazy top lies in the potential for significant yield losses, as well as the associated economic and ecological impacts. The effects of the disease can be mitigated through the use of resistant crop varieties, cultural practices such as crop rotation, and chemical fungicides.

The causes of crazy top are primarily environmental factors such as cool, moist growing conditions, as well as the presence of the fungus in the soil. The disease can also be spread through contaminated seed, or through the movement of infected plant material.

Nutritional properties and values of plants affected by crazy top may be reduced due to the disease. This is due to the fact that crazy top can cause wilting, and can lead to death of the plant, reducing the yield. Further, scientific concerns about crazy top include the potential for the disease to spread to new regions, and the potential for the fungus to develop resistance to fungicides.

Management of crazy top involves a combination of cultural practices, such as crop rotation and the use of resistant crop varieties, as well as chemical fungicides. Factors that can influence the effectiveness of these management strategies include the timing of application, as well as the specific crop and growing conditions.


Overall, crazy top is a significant plant disease that can have serious economic and ecological impacts. The most effective strategies for managing the disease involve a combination of cultural practices, resistant crop varieties, and chemical fungicides. However, it is important to consider the potential negative impacts of these strategies, including the cost and potential environmental effects.

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