Term
| Study of interaction/relationship between a weed and its environment |
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Definition
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| group of individuals of the same species are known as |
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| weed that completes life cycle in 2 years, and found in the rosette stage in one year |
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Definition
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| 4-square weed control approach |
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Definition
Biological
chemical
cultural
physical |
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Definition
| sheep, pathogens, insects |
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Definition
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Definition
| tilling and plowing weeds under |
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Definition
understanding crop
understanding pest
assessment of pests an beneficials
pest economic threshold
determining correct/appropriate control strategy |
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Term
| A B C Q are weed ratings of what kind of weed |
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Definition
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Definition
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Term
| underground stem tissue characterstic of johnson grass |
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Definition
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| stems that grow along the surface |
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Definition
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Definition
are most plants that are around in warm weather. an example would be a dandelion.
little mallow |
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Definition
better competitors
double the water use efficiency
mallow |
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Term
| grass weeds have what type of venation |
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Term
| movement of seeds from one place to another |
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Definition
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Term
| type of biological control when one organism is imported from the area of origin |
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Definition
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Definition
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| One thing not included in biological control |
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Definition
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Term
| first commercially synthesized herbicide |
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Definition
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Term
| Example of physical weed control |
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Definition
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Term
| crops used to aid in establishment of other crops |
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Definition
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Term
| family of worlds worst weeds |
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Definition
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Term
| failure of a seed to germinate under optimal environmental conditions |
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Definition
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Term
| cover crop is an example of _______ weed control |
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Definition
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Term
| period in which crops must be maintained weed free to avoid damage is called _______ |
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Definition
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Term
| density of a weed population at which control is economically justified because of the potential of yeild reduction is called _____ |
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Definition
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Term
| when two or more plants from different species compete, competition is called _____ |
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Definition
| inter specific competition |
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Term
weeds compete with crops for 3 things
1)____ 2)_____ 3)_____ |
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Definition
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Term
| w benefits of weeds are__________ |
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Definition
erosion protection
________ |
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Term
| Example of a selective herbicide |
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Definition
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Term
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Definition
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Term
| what soil type may require the highest label rate of an herbicide |
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Definition
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Term
| physical or chemical binding of the chemical to the surface of the pant or soil particle is called |
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Definition
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Term
| the moving of herbicide to the vacuole is known as |
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Definition
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Definition
| are not necessarily GMO's |
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Definition
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Definition
used in cotton, fruits, vegetables, ornamentals
Fusilade
Lipid Synthesis inhibitors |
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Term
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Definition
used in many broadleaf crops
Prism, Select
Lipid Synthesis inhibitors |
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Term
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Definition
oxyfluorofen
contact cell membrane disruptor |
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Term
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Definition
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Term
| why are A. Bipyridyliums restricted use herbicide? |
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Definition
high acute toxicity
diquat
paraquat |
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Term
| purpleing veins on the backside of of leaves is a sign of what mode of action? |
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Definition
| amino acid synthesis inhibitors |
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Term
| Sulfonylureas are what mode of action? |
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Definition
| Amino acid synthesis inhibitors |
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Term
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Definition
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Term
| If it ends with -URON it is a |
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Definition
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Definition
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Definition
| is the inner side of the plasma membrane |
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Definition
| free diffusional space outside the plasma membrane |
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Definition
| herbicide movement from the leaf blade to the petiole, stem, and roots |
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Term
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Definition
| herbicide movement from the base to the tip of a leaf |
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Term
| waxy layer on surface of leaf |
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Definition
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Term
| two factors that affect foliar applied herbicides |
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Definition
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Term
| herbicides persist in the soil into the next growing season |
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Definition
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Term
| length of time from from time of application till when next crop can be planted |
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Definition
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Term
| three ways herbicides can degrade in teh environment |
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Definition
microbes
photodegridation
plant metabolism |
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Term
| leaf blades of grasses can easily be seperated form whorls, what type of herbicide |
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Definition
| lipid synthesis inhibitors |
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Term
| This mode of action leaves broadleafs unaffected |
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Definition
lipid synthesis inhibitors
ACCase |
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Definition
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major injury symptom
growth regulator |
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Definition
stem twisting (epinasty)
onion leafing
dicamba, 2-4D, |
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Term
major injury symptom
amino acid synthesis |
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Definition
stunted growth
interveinal chlorosis
grass leaves turn shades of red/purple
glean, matrix, glyphosate |
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Term
major injury symptom
lipid synthesis inhibitors |
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Definition
can pull out dead whorl
chlorosis to reddening
prism, poast, fusilade |
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Term
major injury symptom
cell membrane disruptors |
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Definition
rapid necrosis of tissue, on sunny days
leaves have burned appearance
shark, chateau, gramoxone, goal |
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Term
major injury symptom
photosynthesis inhibitors |
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Definition
chlorosis to necrosis of leaf margins/tips
oldest leaves first
atrazine, simazine |
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Term
major injury symptom
seedling growth inhibitors |
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Definition
grasses
purple stunted plants clubbed roots
Broadleaves
brittle stems, cracked hypocotyles
surflan, dual |
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Term
major injury symptom
pigment inhibitors |
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Definition
plants turn white (bleaching)
solicam |
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Term
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Definition
Used to prepare field for planting
mold board plow
hook plow |
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Term
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Definition
usually used for weed control while crop is growing
cultivator
disk plow |
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Term
| 3 types of biological control |
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Definition
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