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14 Cards in this Set
- Front
- Back
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What is weed science?
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the study of weedy plant species that interfere with human activities and generally associated with a certain degree of management
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What is the Weed Science Society of America's definition of a weed?
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plants originating under natural environments and in response to imposed environments, interfere with human activity
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What was the first event in weed history?
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salting the earth in Carthige by Romans
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What is the total amount of time spent controlling weeds in under developed countries?
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40%
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How much moneyis lost yearly in the US?
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$5 billion
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What is the losses for Florida in yield and total economic impact?
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Over $283 million in yield;
$3.5 billion in total economic impact |
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What factors go into the economic losses due to weeds?
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herbicides, loss in yield, loss in quality, loss in extra land preparation/cultivation, loss in land value, loss in increased harvesting costs
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What are the biggest commodities?
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turf, pasture, citrus, sugarcane
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What are 6 examples of detrimental impact?
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1) direct competition for resources
2) money 3) reduce land value 4) harbor harmful pests 5) interference with water management and flood control 6) interferes with transportation and recreation |
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What detrimental impact is gerkins in the peanut wagon?
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quality because it causes a drying problem
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What is phytophotodermatis?
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sensitivity to light in livestock causing cracking
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Who was Jethro Tull?
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he was the first to plant crops in rows
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In what ways can weeds impair the quality of livestock?
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mechanical/physical irritation
sensitivity to sunlight poisonous--internal bleeding, digestive problems Cause abortion taint milk |
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What are the characteristics of r-strategy annuals?
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large number of offspring with high dispersion potential
small seeded annuals pioneering species self cross lot of energy into reproduction |
