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Powdery mildew fungus, Sphaerotheca macularis pulled off surface of a hemp leaflet. Left, a chain of condida; right, a tangle of superficial hyphae. LM × 400, in lactophenol and cotton blue stain.
Source publication
This note continues the “Cannabis Clinic” series, presenting diseases and pests of hemp, featuring color illustrations of signs and symptoms. The fungus Trichothecium roseum produces a white fuzz that covers branches, leaves, and flowering tops of hemp. These symptoms have been confused with true powdery mildew, caused by Sphaerotheca macularis. We...
Context in source publication
Citations
... To date, the application of chemical controls such as bicarbonates or refined horticultural oils, has been used to control powdery mildew in other crops (Fernandez et al., 2006). However, these sprays may injure young seedlings, and may have deleterious effects on soil structure (McPartland and Hillig, 2008). Bacillus subtilis has been shown to effectively control strawberry and cucurbit powdery mildew caused by Sphaerotheca macularis (Lowe et al., 2012) and Podosphaera fusca (García-Gutiérrez et al., 2013), respectively, while Pseudomonas aeruginosa can control pea powdery mildew when applied as a foliar spray (Bahadur et al., 2007). ...
Legal Cannabis production is now experiencing growing consumer demand due to changing legislation around the world. However, because of heavy restrictions on cannabis cultivation over the past century, little scientific research has been conducted on this crop, in particular around use of members of the phytomicrobiome to improve crop yields. Recent developments in the field of plant science have demonstrated that application of microbes, isolated from the rhizosphere, have enormous potential to improve yields, in particular under stressful growing conditions. This perspective carefully examines the potential for plant-growth promoting rhizobacteria (PGPR) to improve marijuana and hemp yield and quality. It then explores the potential use of PGPR for biological control of plant pathogens, which is particularly interesting given the stringent regulation of pesticide residues on this crop. As an industry-relevant example, biocontrol of powdery mildew, a common and deleterious pathogen affecting cannabis production, is assessed. Finally, two PGPR in genera frequently associated with higher plants (Pseudomonas and Bacillus) were selected as case studies for the potential effects on growth promotion and disease biocontrol in commercial cannabis production.
... The fungus is associated with wheat, especially during seasons of high precipitation (216), and is among the fungi that can use wheat gluten as a substrate in the fermentation of minchin, a Chinese cereal-based food (2). T. roseum can overwinter in soil or crop debris, while under conditions of high humidity, such as one would find in a cheese cave, it grows well and sporulates (217). Proteases of T. roseum may warrant investigation to clarify the role of T. roseum in the microbial ecology of cheese ripening. ...
The Good, the Bad, and the Ugly: Tales of Mold-Ripened Cheese, Page 1 of 2
Abstract
The history of cheese manufacture is a “natural history” in which animals, microorganisms, and the environment interact to yield human food. Part of the fascination with cheese both scientifically and culturally stems from its ability to assume amazingly diverse flavors as a result of seemingly small details in preparation. These details have been discovered empirically and independently by a variety of human populations and, in many cases, have been propagated over hundreds of years.
