White spots on snap peas, also known as pea leaf spot, is a common disease caused by the fungus Mycosphaerella pinodes. This fungus affects the leaves, stems, and pods of snap peas, causing small, circular, white or gray spots to appear on the plant’s surface.
The fungus thrives in cool and damp conditions, and is most likely to infect snap peas during the spring and fall seasons. High humidity levels and heavy dew can also contribute to the development of pea leaf spot.
Symptoms of the disease include small, circular, white or gray spots on the leaves, stems, and pods of snap peas. The spots can range in size from a pinhead to a quarter-inch in diameter, and are often surrounded by a yellow halo. In severe cases, the spots can merge together, causing large, necrotic areas on the plant.
The fungus can also cause premature defoliation, which can significantly reduce the yield of snap peas. In addition, the fungus can weaken the plants, making them more susceptible to other diseases and pests.
Preventing pea leaf spot on snap peas can be done by providing good air circulation around the plants, avoid overhead watering, and avoid planting in areas with poor drainage. Crop rotation can also be helpful in preventing the build-up of the fungus in the soil.
If pea leaf spot is already present in the garden, fungicides can be used to control the disease. However, it’s important to follow the instructions on the fungicide label and to apply the fungicide at the appropriate time for maximum effectiveness.
In summary, white spots on snap peas, also known as pea leaf spot, is a common disease caused by the fungus Mycosphaerella pinodes. The fungus thrives in cool and damp conditions, and is most likely to infect snap peas during the spring and fall seasons.
Symptoms include small, circular, white or gray spots on the leaves, stems, and pods of snap peas, which can lead to premature defoliation, and reduce the yield of snap peas. Prevention can be done by providing good air circulation, avoiding overhead watering, planting in areas with good drainage, crop rotation and the use of fungicides if necessary.
