Applicators License 1C – Iowa Exam
Questions and Answers
Plant Disease - ANS-Any abnormal condition that damages a plant and alters its
appearance
Plant Disease Triangle - ANS-Susceptible host plant, a pathogen, and a favorable
environment
Symptoms - ANS-Visible effects of plant disease
Do new pathogens or old pathogens do more damage? - ANS-New pathogens do more
damage than already existing pathogens in an area, pathogens from abroad are the
biggest problem, e.g. the introduction of SCN
Seed Certification - ANS-Seed of known origin, returns desired stand with vigorous,
relatively disease free plants, and has a known germination percentage
Resistant Varieties - ANS-Least expensive, easiest, safest, and most effective means of
managing diseases in crops. For some diseases it is the only way to produce
acceptable yields, for others they are not the complete answer
Immune - ANS-The pathogen cannot produce disease under favorable conditions with
these varieties
Tolerant - ANS-The variety can produce a good yield despite infection
Susceptible - ANS-These varieties are greatly damaged or killed by the pathogen
Cultural Control Methods - ANS-Crop rotation, Residue management, disease free
seed, field location and selection, disease-free seed, proper planting, cultivation,
sanitation, controlling insect vectors, weed control, fertility, varying the planting date,
proper harvest, proper storage
Chemical Control Methods - ANS-Fungicide, Nematicides, Bactericides, Viricides
Contact Fungicides - ANS-Remain on the surface, don't go deeper, no after infection
activity, repeated applications needed
Systemic Fungicides - ANS-Absorbed into plant tissue, offer after infection activity,
some only move up the plant, some only move a small way through the plant
Questions and Answers
Plant Disease - ANS-Any abnormal condition that damages a plant and alters its
appearance
Plant Disease Triangle - ANS-Susceptible host plant, a pathogen, and a favorable
environment
Symptoms - ANS-Visible effects of plant disease
Do new pathogens or old pathogens do more damage? - ANS-New pathogens do more
damage than already existing pathogens in an area, pathogens from abroad are the
biggest problem, e.g. the introduction of SCN
Seed Certification - ANS-Seed of known origin, returns desired stand with vigorous,
relatively disease free plants, and has a known germination percentage
Resistant Varieties - ANS-Least expensive, easiest, safest, and most effective means of
managing diseases in crops. For some diseases it is the only way to produce
acceptable yields, for others they are not the complete answer
Immune - ANS-The pathogen cannot produce disease under favorable conditions with
these varieties
Tolerant - ANS-The variety can produce a good yield despite infection
Susceptible - ANS-These varieties are greatly damaged or killed by the pathogen
Cultural Control Methods - ANS-Crop rotation, Residue management, disease free
seed, field location and selection, disease-free seed, proper planting, cultivation,
sanitation, controlling insect vectors, weed control, fertility, varying the planting date,
proper harvest, proper storage
Chemical Control Methods - ANS-Fungicide, Nematicides, Bactericides, Viricides
Contact Fungicides - ANS-Remain on the surface, don't go deeper, no after infection
activity, repeated applications needed
Systemic Fungicides - ANS-Absorbed into plant tissue, offer after infection activity,
some only move up the plant, some only move a small way through the plant
