Anthracnose of peppers and other solanaceous crops

Colletotrichum baltimorense is a species of pathogenic fungi recognized as a causative agent of anthracnose in various economically important plants, particularly within the Solanaceae family. As an aggressive pathogen, it significantly affects the production of peppers and tomatoes, posing a persistent challenge for both commercial greenhouse operations and small-scale field cultivation.

The primary clinical signs of the disease are characterized by sunken necrotic lesions on fruits, which often exhibit dark, concentric rings. As the disease progresses, the center of these lesions develops acervuli—small, pimple-like structures where spores are produced. In high humidity, these structures may ooze masses of spores, giving the lesions a gelatinous or pinkish appearance, eventually leading to fruit rot and fruit drop.

Development of the fungus is heavily dependent on moisture and moderate to warm temperatures. Spores are primarily dispersed through splashing water, such as rain or overhead irrigation, as well as by contaminated tools or human activity. The pathogen can survive between growing seasons on crop debris or as a latent infection on seeds, making hygiene a crucial component of disease management.

The virulence of Colletotrichum baltimorense is significant due to its ability to spoil fruit rapidly during the maturation phase. This leads to substantial post-harvest losses, as the infection makes the produce visually unappealing and susceptible to secondary decay. Farmers often face severe yield reductions if the climate conditions remain favorable for fungal sporulation during the critical flowering and fruiting stages.

Effective control of anthracnose requires an integrated approach that emphasizes prevention and early intervention. Key practices for disease suppression include:

• Utilizing certified disease-free seeds or treated planting material.
• Maintaining proper spacing between plants to improve air circulation and reduce humidity.
• Implementing drip irrigation to keep foliage and fruits dry.
• Applying preventive fungicide treatments at intervals during periods of high disease risk.