Lecture 17 Flashcards
1
Q
Impact of pests and diseases in plant ag
A
- Direct impacts at the production dn post-harvest stages (money and food loss)
- indirect impacts at processing, packaging and storage, transport, or consumer
- costs in lost production and expenses for protection
- crop losses can result in food storages
- displacement of ag production from a region
2
Q
“Rust” Fungi
A
Present since the beginning of ag and specifically mentioned in the Bible and by the ancient greeks and romans
- Roman god Robigus –> animal sacrifices in the spring
3
Q
Ergot of rye
A
Ergotism resulting from toxic alkaloids –> loss of circulation to limbs
- thrives in cold wet weather
- acts as a hallucinogen
4
Q
TMV
A
Contagious living fluid
- first virus to be crystallized
5
Q
Why was late blight so severe in 1845?
A
Genetic uniformity
hgih density of plants
cull piles
cool wet weather
6
Q
Managing late blight disease
A
Genetic resistance
fungicides
crop rotation
sanitation
7
Q
Look at lecture 17
A
slide 51
8
Q
Risks from pesticides
A
Worker exposure
enviro effects
consumer exposure
9
Q
Benefits from pesticides
A
Greater variety of produce more affordabe public health less stress on plants/animals Ag productivity increases
