Zimmermanniella trispora, a Leaf Parasite of Mango in Malaysia. T. K. Lim, Department of Plant Protection, University of Agriculture Malaysia, Serdang, Selangor, Malaysia. K. C. Khoo, Department of Plant Protection, University of Agriculture Malaysia, Serdang, Selangor, Malaysia. Plant Dis. 67:1389. Accepted for publication 1 September 1983. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-1389.

The cause of severe spotting of neglected mango (Mangifera indica L.) trees in Malaysia was determined to be Zimmermanniella trispora P. Henn. Mature leaves had yellow circular lesions about 2–3 mm in diameter on the abaxial surface and dark, crusty oblong structures about 1 mm in diameter on the adaxial surface. The crusty structures were multilocular ascostromata. The locules were obovate to oval and bore fascicles of clavate hyaline asci interspersed with sterile filiform paraphysoids. The ascus was 104.37 μm (72–145 μm) long and 4.80 μm (4.76–4.92 μm) wide and bore three (rarely four) ellipsoid hyaline ascospores 18.94 μm (15–24 μm) × 4.70 μm (4.68–4.74 μm). This is the first report of Z. trispora as a leaf parasite of mango.