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23 Cards in this Set
- Front
- Back
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What are 5 types of pest problems?
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-weeds
-insects -diseases -birds -animals |
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What is beneficial about chemical pesticides?
How about problematic? |
-rapid and complete control
-dangerous and can pollute environment |
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What is a weed?
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-Any plant out of place!
-competes for space, water, and nutrients |
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What is allelopathy?
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-using chemicals to inhibit another plant such as Juglans nigra
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How do weeds spread typically?
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-seeds
-rhizomes |
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What are some cultural control of weeds?
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-plastic mulches (porous black plastic or clear to cook weeds)
-Bark mulch (supress weeds: 3" deep!) |
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What is coning around a tree? Is it good or bad?
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-piling of mulch on old mulch until it gets so high it forms a cone!
-BAD! |
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Why is coning bad for trees?
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-traps moisture
-water sprouts -allows pests easier -looks poor -prevents composting of bottom material |
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What are two categories of chemical weed control?
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-selective such as 2,4-D
-non selective such as roundup |
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What is a contact herbicide?
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-injury to parts of the plant the herbicide contacts
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What is a translocated herbicide?
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-chemical moves systemically through the vascular system of plant such as roundup
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What is a residual herbicide?
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kills during and after application
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What is a nonresidual herbicide?
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kills only when applied
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What is a preemergent herbicide?
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-applied after teh crop is seeded but before it comes through soil surface
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What is a postemergent herbiced?
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applied after crop has emerged
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What are the numerous categories of weed control?
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-selective
-nonselective -contact -translocated -residual -nonresidual -preplant -preemergent -postemergent |
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What are three things that affect herbicides?
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-soil texture
-soil moisture -light exposure |
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What type of soil do herbicides persist longer in?
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-sandy dry soils (no microbes to degrade chemicals)
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What chemical is used selectively to kill only broad leafed weeds (like dandelions)?
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2,4-D
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What are symptoms of plant injury from herbicides?
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-curling of leaves
-light color of veins and leaves -browning and death (tomatoes, grapes, lilacs, maples) |
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What are three things to do to prevent herbicide injury?
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-spray when air is still
-spray when it is coot (heat volatilizes chemicals) -never use herbicide sprayer for other purposes |
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What is biological weed control?
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-one living organism used to control another
-little success seen with this yet |
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What is WOW! Plus?
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-an organic weed control
-a by-product of corn syrup -pre-emergent herbicide -selective (broadleaf) -can walk on it after applied -can be used in vegetable and flower garden! (on established plants only) |
