PLPA 301 Study Guide - Midterm Guide: Root Rot, Canker, Fruit Tree
20 Feb 2019
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Document Summary
Organisms and environmental factors that cause plant disease. Mechanism by which these factors induce disease in plants. Interaction between disease-causing agents and the diseased plant. Abiotic (non-living) pathogens cause non-infectious (not transmissible) diseases. E. g. environmental factors such as temperature, moisture, nutrients. E. g. bacteria, fungi, nematodes, parasitic plants, etc: name categories of diseases based on types of organs, crops and pathogens. Rots - discoloration and decay due to disintegration and decomposition of tissues. Damping- off - seedling death just prior to (pre-emergence) or just following (post- emergence) emergence from soil. Cankers - localized necrotic (dead, usually dark brown to black) areas associated with death of phloem. Galls - hyperplasia (increase in number of cells) Wilt- when transpiration > water absorption and turgor in cells is lost. Fungal (eukaryotes that have membrane bound nucleus and mitochondria) Largest category of disease-causing agents in plants. No chlorophyll so can"t make own food. Cell walls of chitin, glucan, cellulose, or both.
