Environmental weeds are:

1.   ?    weeds that are good for the environment
2.   ?    plants that invade areas of natural ecosystems
3.   ?    weeds that grow where you don't want them
4.   ?    all annual plants

Environmental weeds are often spread by:

1.   ?    animals
2.   ?    machinery
3.   ?    wind and water
4.   ?    all of the above

An example of a mechanical method of controlling environmental weeds is:

1.   ?    spraying
2.   ?    using a living organism
3.   ?    digging out the weeds
4.   ?    grazing

Which of the following is an example of controlling weeds using a biological control?

1.   ?    introducing an aphid to control nodding thistle
2.   ?    ripping a pasture to control Pattersons Curse
3.   ?    spraying glyphosate on the lawn to kill weeds
4.   ?    sowing pasture species that will compete with the weeds

An example of using an environmental control to manage weeds is:

1.   ?    digging weeds out by hand
2.   ?    spraying weeds using a chemical with low toxicity
3.   ?    shading out weeds with other plants so they cannot grow
4.   ?    introducing a parasite to eat the weed