hour_test2_answers - Student Name Weed Science PLS 4601c...

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Student Name _____________________________________________ Weed Science, PLS 4601c Section 7644 and Grad. – Prin. Of Weed Science AGR 6932 Section 9212 University of Florida - Davie http://grove.ufl.edu/~turf/weedscience/ Philip Busey, [email protected] 954-579-3932 (cell) July 23, 2009 Hour Test 2 (circle the right answers) Take-home, open-book (includes Internet), no helping or getting help Send answer to: [email protected] by 11:59 pm, Monday, August 3 Invasive weeds 1. Which invasive weed is a vine? a) catclaw mimosa b) cogongrass c) hydrilla d) kudzu <<<<<<<< e) paperbark tree 2. Which invasive weed is a poisonous shrub? a) hydrilla b) kudzu c) Old World climbing fern d) paperbark tree e) tropical soda apple <<<<<<<< 3. Which invasive weed is not a flowering plant? a) Dioscorea bulbifera b) Imperata cylindrica c) Lygodium microphyllum <<<<<<<< d) Neyraudia reynaudiana e) Pistia stratiotes
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Weed Science – Hour Test 2 - Univ. Florida - Davie Page 2 4. Which invasive weed is a monocot? a) air potato <<<<<<<< b) hydrilla <<<<<<<< c) kudzu d) Old World climbing fern e) Waterlettuce <<<<<<<< 5. Which invasive weed is a dicot? a) Hydrilla verticillata b) Imperata cylindrica c) Neyraudia reynaudiana d) Pistia stratiotes e) Solanum viarum <<<<<<<< 6. Of the 10 invasive weeds on Weed Set 2, which do you think is the most dangerous and why? For whichever weed is chosen, “dangerous” by dictionary definition involves the potential of something to cause harm or injury. In a weed context, this could include loss of property, ecological damage, or injury or death of humans and other important species. For a weed to be “most dangerous” it must therefore be most capable of occurring to an extent and/or in such a way that harm or injury can occur. To identify and explain the “most dangerous” weed it must have the properties that cause harm or injury which could include poisonous properties and/or the ability to deplete resources and/or the ability to replace beneficial species . A weed can be more dangerous if there is no way to control it or if control is difficult or costly or if control is delayed because the weed is not noticeable at first. Here are examples: Harmfulness: hydrilla can cause floods and/or drown people ; tropical soda apple can poison livestock ; melaleuca can replace native plants and make areas impassable to wildlife ; lygodium and kudzu smother other vegetation ; lygodium is a fire hazard ; any strong growing weed can consume considerable water . Reproduction: melaleuca and other weeds can spread far and wide by small seed; lygodium has a wide range of habitats Control may be difficult because a weed ensnarls other plants and cannot be selectively treated ; or because there are no selective herbicides or no known biocontrol .
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Weed Science – Hour Test 2 - Univ. Florida - Davie
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hour_test2_answers - Student Name Weed Science PLS 4601c...

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