Damage on nut caused by Aceria guerreronis (source: ©CABI BioScience/Dave Moore)
Extensive damage can be observed through the scarring and distortion of nutlets. Binoculars can support with inspecting taller trees.
A. guerreronis was first reported in Mexico and subsequently there were records from other regions of the Americas; Anguilla, Bahamas, Belize, Costa Rica, Cuba, Dominica, Dominican Republic, Grenada, Guadeloupe, Haiti, Jamaica, Martinique, Puerto Rico, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad and Tobago, United States, Brazil, Colombia, Venezuela. It is also reported in Africa; Benin, Cameroon, Ivory Coast, Gambia, Mozambique, Nigeria, São Tomé and Príncipe, Tanzania, Togo, Asia; India, Malaysia, Maldives, Oman, Philippines, Sri Lanka, and Europe; Hungary, Poland.