PL PATH 300 Study Guide - Midterm Guide: Ascocarp, Crop Rotation, Crop Residue
Document Summary
Measure: temperature, rel. humidity, rainfall, biology of organism, cloud cover. Basic infection rate- basic reproductive number (has to be >1) Apparent infection rate- infection that goes along with sigmoid shaped curve. Polycyclic- exponential, sigmoidal, logistic, compound interest, log (y/y-1) Diseased plant gets blown by wind (take off) transported by wind lands on another plant multiplies. Management system used to predict the occurrence or change in severity of plant diseases. To get viral resistance: a coat protein gene. To get fungal resistance: use an antifungal gene (chitinase gene). Tillage- preparation of the soil by plowing, ripping, or turning it. Bury enough residue to reduce your disease risk while leaving a sufficient amount of surface residue to slow erosion. Soilborne disease organisms thrive under cool, wet conditions and they are often less severe in tilled fields since tillage dries the soil and speeds warming.
