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by: Sarai Hauck


Sarai Hauck
GPA 3.84


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About this Document

Class Notes
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This 3 page Class Notes was uploaded by Sarai Hauck on Friday September 18, 2015. The Class Notes belongs to PLS 4601 at University of Florida taught by Staff in Fall. Since its upload, it has received 24 views. For similar materials see /class/206856/pls-4601-university-of-florida in Plant Science at University of Florida.




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Date Created: 09/18/15
Review of Lecture 4 Duration of Competition Weeds which emerge before or with the crop generally reduce crop yield more than weeds that emerge after the crop The longer weeds are permitted to compete with a crop the greater the crop yield loss will be FL in Duration of Competition Weed Competition Period Is the maximum length of time that weeds can be allowed to compete with a crop and not result in yield loss Determined by keeping crop weed free for various intervals after planting Thereafter weeds are allowed to reinfest and compete with crop m Weed Competition Affected By As weed density increases severity of the effect on crop increases Density at which intraspecific competition begins is generally maximum competition Duration of Competition WeedFree Requirement 39 Is the minimum period following crop emergence that the crop must be maintained free of weeds in order to prevent crop yield loss 39 Determined by growing weed and crop together for differing periods until weed removal Cro 39 subsequently grown weed free until harvest FL u Critical Period Time when control measures need to be implemented Early in life cycle weed and crop plants are for enough apart so no interference occurs When weed begins to shade crop critical period begins FL u Threshold defined as a point at which a stimulus is just strong enough to produce a response Threshold Aeron threshold Incudes consideration of other factors such as the effect of allowing a weed to produce seed seed rain which may potentially affect weed management in succeeding crops Action threshold is the point at which some control action is initiated FL in Allelopathy Potential uses in weed management Crops which are allelopathic toward weeds cover crops Threshold 39 Damage titrestold Is the weed population at which a negative yield response is detected 39 Economic titrestold Is the weed density at which the value of the loss due to weed competition exceeds the cost of control Allelopathy Chemical released by one plant has a detrimental effect 0 surrounding species Components of Weed Management Practices used to restrict the growth and spread of weeds grouped into 3 categories gtgtPrevention gtgtEradication gtgtContro


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