Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2023 Jun 13;14:1192035. doi: 10.3389/fmicb.2023.1192035

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © Punja, Ni, Lung and Buirs.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

PMC Copyright notice

The impact of leaf litter left on the greenhouse floor on total yeast and mold levels present in the air and on adjacent cannabis inflorescences. (A,B) Leaf litter was purposely left on the floor to dry below cannabis plants. (C,D) Grinding and plating samples of leaf litter onto PDA + S reveals the presence of Aspergillus, Fusarium and Penicillium. (E) Comparison of TYM levels in air samples (left) and on cannabis inflorescences (right) in the absence and presence of leaf litter, and in the presence of leaf litter with harvesting activity by workers. Vertical bars show the mean of 20 Petri dishes with error bars reflecting 95% confidence intervals. Letters above bars denote significant differences according to Tukey’s post-hoc test (p < 0.05). (F) Petri dishes with colonies of TYM exceeding 100,000 cfu/gm originating from cannabis inflorescences exposed to leaf litter and harvesting activities. Yellow colonies are Aspergillus ochraceus, dark brown colonies are Cladosporium cladosporiodies, and blue-green colonies are Penicillium spp. (G) Comparison of TYM levels in cannabis inflorescences in fresh samples harvested during the period May–October versus November–April. A greater number of samples exceeded the threshold limit, indicated by the horizontal line at 50,000 cfu/g, in the May–October period.