| | The Extension Toxicology Network (Extoxnet) - http://extoxnet.orst.edu/ A collaborative effort of several US universities collecting pesticide information profiles, toxicology information briefs, and other factsheets and newsletters.
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| | Growit.com: Problems Category - http://www.growit.com/Probs/ Knowledge base for the nursery industry provides an extensive series of factsheets on insect and nematode pests, viral and fungal diseases, and environmental problems.
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