I found this “resource for instructors” when browsing the net and thought it would be useful for all, teacher or not. The document is 700 pages long so I’ve not had a chance to review it all yet but it’s an outstanding free resource, it also proives a good structure for those to test their knowledge on organic growing. They are also pointpoint presentations and videos on the link below so be sure to check those free resources out too.
“This manual is revolutionary, because of how dominant the chemical- and resource-intensive paradigmfor growing plants has become. As the world population grows and our climate changes, agricultural and food systems are ever more stressed and will be so for years to come. Diversified farming systems employing the techniques described in this manual absolutely can feed the world, as many studies continue to prove. If the future of food and agriculture is at all sustainable and just, it is far more likely to employ the methods in this manual than so-called conventional agricultural techniques. But perhaps most important for you, our readers, this manual is useful because it works. The practices described here can be employed in a variety of climates, soils, and educational settings. The information on soil science provides a solid grounding for the practices described, and the units on social and environmental issues offer a broader context for those interested in sustainable agriculture.”
DIRECT DOWNLOAD: https://planetpermaculture.files.wordpress.com/2015/03/teaching_organic_farming_pdf.pdf
I’ve just found an excellent website for the most common plant diseases, it’s an amazingly well illustrated document that everyone into Horticulture/Agriculture should check out and bookmark. One of the best resources I’ve come across to date for photographs and illustrations, well worth a look not only when you’re having problems but also to help familiarise yourself with them so you know what to look out for.
It covers the symptoms and signs, pathogen biology, disease cycle, epidemiology, disease management, and scientific, economic and social significance of major plant diseases.
FURTHER READING: https://www.apsnet.org/EDCENTER/INTROPP/Pages/default.aspx