A fruit rot of lemon caused by Ceratocystis radicicola.
In August 2000, bleached to pale brown blotches were observed on ripening lemon (Citrus limon) fruits in Kahnouj, Iran. The spots enlarged, turned into brown sunken areas and encompassed the entire fruit surface and the flesh, leading to a complete decay of the fruit after harvest. Suspensions of phialoconidia from symptomatic tissues were injected into the rind of lime fruit and the periderm of date (Phoenix dactylifera), both at the early ripening stage. Controls were treated similarly, except that distilled water was used instead of the inoculum. Fruit decay symptoms appeared on dates and lime fruits. Conidia were ovate to ovoid, with a flattened base, 14.0-22.5×10.0-17.5 µm in size and short conidiophores. Phialoconidia were hyaline, cylindrical, and 7.0-18.5×2.5-6.5 µm in size. The causal fungus was identified as Ceratocystis radicicola. This is thought to be the first report of C. radicicola causing fruit rot in lemon.