Herbicides

cell division

All living things grow by making more cells, a process called __________ __________

improperly handled or used

Any herbicide is potentially dangerous if

cover crops, cultivation

Besides using different herbicides, what are other ways to prevent resistant weeds?

Some weeds survive the herbicide, they reproduce and pass on the trait to survive

How does herbicide resistance develop?

label from the herbicide

If you are poisoned by a herbicide what should you take with you to the hospital?

kill or injure the crop you plant next year

If you spray too late in the year you risk residual toxicity. What problem could this cause?

No, can accidentally poison and kill someone

Is it OK to store left over herbicide in an empty drink bottle? Why?

1. Stop photosynthesis 2. Block enzymes to make protein 3. Block enzymes to make lipid 4. Block growth hormones 5. Block cell division 6. Rupture cell membrane

List the 6 ways herbicides can kill weeds

consume from open container herbicide drifts into their drinking water eating sprayed plants

Name 3 ways livestock can be exposed to herbicide

kills all types of plants

Roundup is a broad spectrum herbicide. What does this mean?

cell membrane

Some herbicides cause plant cells to explode by attacking the _______ ________

cell division

Some herbicides prevent plants from growing by blocking _________ _______ so they can't make new cells.

photosynthesis

Some herbicides starve plants out by preventing __________ so they can't make carbohydrates

growth hormones

Some herbicides work by blocking the ________ ________ that stimulate plants to grow.

enzymes

Some herbicides work by blocking the __________ that make proteins and lipids

eat, drink, smoke

What 3 things should you never do while using a herbicide?

use for energy or convert to lipid and protein

What do plants do with the carbohydrates they make during photosynthesis?

oxygen

What extra molecule do plants give off during photosynthesis?

The dose that kills 50% of test animals

What is LD50 ?

After it has rained or the plants are dead

What is it safe to allow livestock to graze in pasture that has been sprayed with herbicide?

5 miles per hour

What is the maximum wind speed for spraying herbicide?

microbes in soil

What is the primary way that herbicides break down and are no longer effective?

protein

What molecule do you get when you put several amino acids together?

drift

What problem are you preventing by waiting for a less windy day to spray herbicide?

laws about the use of the herbicide

What should you be familiar with before using any herbicide?

bathe and wash clothes

What should you do as soon as you are done applying a herbicide?

larger drops

What size drops of herbicide should you use to reduce drift?

runoff

What term refers to rain water moving over the ground and carrying herbicide to the rivers and other bodies of water?

When plants photosynthesize, they take in H2O through their roots and CO2 through their leaves and use sunlight to convert them into carbohydrate

When plants photosynthesize, they take in ________ through their roots and _______ through their leaves and use sunlight to convert them into _________.

paraquat

Which herbicide attacks the cell membrane of weeds?

2,4-D

Which herbicide is an auxin and was used in the agent orange from the Vietnam War?

paraquat

Which herbicide is called a burn down because it works so quickly?

paraquat

Which herbicide is deadly if only 1 teaspoon is ingested?

Roundup

Which herbicide kills weeds by blocking enzymes that make amino acids

Poast

Which herbicide kills weeds by blocking the enzyme that makes lipids

2,4-D

Which herbicide kills weeds by mimicking growth hormone and causing an overgrowth of cells in vascular tissue which blocks the flow of water to leaves

Command

Which herbicide makes weeds turn white by destroying chlorophyll

Lasso, Treflan, Atrazine, Command

Which herbicides kill weeds to preventing photosynthesis?

Lasso, Treflan

Which herbicides must be in the soil before weeds germinate?

Lasso, Treflan

Which herbicides prevent cell division in germinating weeds?

LD50 of 100 is the more toxic

Which is more toxic, a herbicide with an LD50 of 100 or one with an LD50 of 200?

carbohydrate

Which type of molecule do plants make when they photosynthesize?

palmer amaranth (palmer pigweed)

Which weed became roundup resistant in the South and is spreading?

To prevent resistance

Why is it important to use herbicides with multiple modes of action?

prevent drift

Why should you adjust the height of your sprayer to be as close to the ground as possible?

drift

____________ occurs when herbicide spreads through the air to unintended areas while it is being spayed.