Invasive Species B/C

[gavinnupp]

ok

[tm-scioli]

here (Click to Show Hidden Text)

[img]http://farm4.static.flickr.com/3287/2412117163_cbaf029c82.jpg[/img]
1. names
2. in which state is this most problematic
3. biocontrol?
4. native range
5. impacts

[chscioly]

Answer (Click to Show Hidden Text)

1. Purple star thistle, [i]Centaurea calcitrapa[/i]
2. California
3. None
4. The Mediterranean area
5. Crowds out desirable plants on pastures

[tm-scioli]

nice, your turn (Click to Show Hidden Text)

also inhibits wildlife and livestock movement because very thorny and the thorns remain on even the dried plants for many months after

[chscioly]

Question (Click to Show Hidden Text)

[img]http://plants.ifas.ufl.edu/wp-content/uploads/files/mng/img/01_invasives_giant_salvinia_03.jpg[/img]
1. Common, scientific names
2. Where is it native to?
3. Impact?
4. Chemical control?

[tm-scioli]

Salvinia molesta, giant salvinia
i think the amazon basin
blankets the water surface, creates mosquito breeding grounds, crowds out native species, inhibits recreational activities, lowers dissolved oxygen content
chemical control using diquat and various others can work, but generally it isn't capable of eliminating salvinia; biocontrol is usually more effective

[chscioly]

Yeah, your turn

[tm-scioli]

1. names
2. is chemical control effective?
3. What biocontrols may be used?
4. describe its life cycle in the US versus in its native range

[Jaol]

1. Adelges tsugae (Hemlock Wooly Adelgid)
2. Nah. Too much evolution
3. Off the top of my head I don't remember.. but I think there is a golden beetle or something.
4. I believe its life cycle in the US is shorter because the climate is different here in the South than its native range (cooler in the US)

[tm-scioli]

2. for the most part, but there are some systemic insecticides work (but it isn't cost effective so nobody really uses them)
3. there are 2 beetles, but they're black not golden (Pseudoscymnus tsugae, Laricobius nigrinus)
4. that's one part. The other is that in their native range they migrate to spruce trees to complete the sexual phase of their lifecycle, but they are incapable of doing so in the US because there aren't any good spruce trees here your turn