Gibbago trianthemae,phaeodictyoconidial genus,cause leaf spot disease of Trianthema portulacastrum

In the years 2011–2014, a series of surveys were conducted to record infestation and search natural fungal pathogens of Trianthema portulacastrum in various states of India. Among ten different agricultural important crops, heavy infestation and percentage of occurrence were observed. Gibbago trianthema, phaeodictyconidial genus, causing leaf spot disease was found on horse purslane at different districts of Haryana, Punjab and Uttar Pradesh from infected leaves and stems. Identification was confirmed on the basis of ITS rDNA sequence analysis by Macrogen Inc., Advancing through Genomics, Korea, and from CABI International Mycological Institute, England (IMI Number 502781, 502782). Sequence has been submitted to National Centre for Biotechnology Information (NCBI) with GenBank accession number KJ825852. By in vitro inoculation on Trianthema leaves, the pathogen showed similar symptoms as occurred in nature and proved Koch’s postulates. Various stages of conidia development were observed which proved the blastic-type ontogeny and porogenous development of conidiophore cell.