Disease of Guava
Anthracnose: Colletotrichum gloeosporioides
Symptoms
Symptoms of this disease are observed on mature fruits on the tree. The characteristic symptoms consist of sunken, dark colored, necrotic lesions. Under humid conditions, the necrotic lesions become covered with pinkish spore masses. As the disease progresses, the small sunken lesions coalesce to form large necrotic patches affecting the flesh of the fruit.
Pathogen
Conidia are hyaline, aseptate, oval to elliptical condiophore is cylindrical. Acervulli are dark brown to black.
Mode of Spread and Survival
The conidia are spread by wind or rain.
Management
Spray Mancozeb 0.25%.
Guava rust: Puccinia psidi
Symptoms
The pathogen can affect foliage, young shoots, inflorescences and fruit of guava. Typical symptoms associated with this disease include distortion, defoliation, reduced growth and if severe, mortality. On fully expanded leaves, dark bordered, roughly circular brown lesions with yellow halos develop.
Management
Control of guava rust is based on the use of fungicides. Scouting fields for onset of disease or during the times of year when environmental conditions are favorable for pathogen infection are recommended so that proper and timely fungicide applications can.
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