The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report. Asperisporium black spot in Carica papaya: a new disease in Sri Lanka. Culture of Asperisporium caricp, the papaya black spot organism.
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Photo 1. Black spot of papaya, Asperisporium caricae , on the underside of the leaf. Large numbers of spots cause the leaves to dry, die and fall. Photo 2. Close-up of underside of a papaya leaf showing black spot, Asperisporium caricae. If the leaves are severely infected they turn brown and die. Spots on the fruit are also brown to black and slightly sunken. The spores from the underside of the leaves are spread in wind and wind-driven rain. Long distance spread occurs when the fruits are traded at markets.
Usually, the disease is a minor problem, although heavily spotted leaves result in extensive leaf fall. If this occurs, the growth of the trees is affected, and fruit yield is lower than on healthy trees.
Infection of young fruit also causes them to fall, and infections on mature fruit affect their market quality. The disease is worse in wet weather. Look for the dark brown to black spots on the fruit and on the underside of the leaves where the spores are produced; on the top surface the spots are light brown with yellow margins, and fade in colour as they age.
Look for spots mostly on the older leaves. Look to see if the leaves dry and die early when the spotting is severe. Look for the spots on the leaves from below, up into the crown of the tree.
Remove infected leaves and fruit as soon as they are seen, take them out of the plantation and burn them. Make sure that the undersides of the leaves are sprayed, as this is where the spores are produced. This fact sheet is a part of the app Pacific Pests and Pathogens. All rights reserved.
List of symptoms / signs
Asperisporium caricae is an ascomycete fungus that is a plant pathogen , found in North and South America. It is responsible for the black spot disease on papaya trees. It affects generally leaves and fruits at any time. Sporodochia of Asperisporium caricae was growing under side of leaf, dark blackish brown to black, stroma well-developed, erumpent.