Plant 160 quiz 5-herbicide resistance

Herbicide Resistance summary

Academic year: 2018/2019

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California State University Fresno

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Kelsey Galvan Plant 160 Herbicide Resistance May 6, 2020

Herbicides have been an efficient way to eliminate weeds in agriculture. Little did people know that sooner or later herbicide- resistance would begin to occur. Herbicide-resistance is a change in the biology of the weed or the crop of choice that will no longer respond to the herbicide it is being exposed to. It no longer contains genetic susceptibility that would normally respond to the herbicide exposure. There are hundreds of herbicide-resistant weed biotypes that have evolved, that go back to starting in the 1950s, and the numbers are only increasing. More people in the agriculture industry need to be aware of these obstacles so that we can efficiently work around and no longer contribute to the issue. Any weed population that has resistant weeds will survive the herbicide applications, which allows these weeds to continue reproducing. Of course, resistant weed biotypes didn’t occur overnight, since these weeds have undergone an evolutionary process. Resistance is the outcome of applying the same herbicide chemical repetitively, and if it continues to be repeatedly used then the resistant weed population will only continue to rise. Once the resistant weed biotype reproduces, the biology of the seed will be the same, and now the field will only increase in the resistant biotypes. A little deeper into the situation is that there isn’t even only one type of resistance, the three being: single herbicide resistance, cross herbicide resistance, and multiple herbicide resistance. Single resistance is a weed resistant to one herbicide, cross resistance is a weed resistant to two or more herbicide families with the same mode of action, and multiple resistance is a weed resistant to two or more herbicides with different mode of action. It is crucial

for those involved in agriculture to do our best to learn and implement strategies to minimize herbicide resistance. Since the number of weeds resistant to specific herbicides is so big, it is essential for the people in the agriculture industry to learn how to manage resistant biotypes and how to avoid supplying to the continuous evolutionary process weeds are going through. Management practices can be responded to by weed shifts, by affecting the rate of occurrence in the weed population. The resistant weeds have evolved mechanisms to resist herbicides in their own way. There’s no way that we people can beat the biology of weeds at this point, but we can prevent or delay the process of the evolvement of herbicide resistant weeds.

Kelsey Galvan

Plant 160

Herbicide Resistance

May 6, 2020

Herbicides have been an efficient way to eliminate weeds in agriculture. Little did people

know that sooner or later herbicide- resistance would begin to occur. Herbicide-resistance is a

change in the biology of the weed or the crop of choice that will no longer respond to the

herbicide it is being exposed to. It no longer contains genetic susceptibility that would normally

respond to the herbicide exposure. There are hundreds of herbicide-resistant weed biotypes that

have evolved, that go back to starting in the 1950s, and the numbers are only increasing. More

people in the agriculture industry need to be aware of these obstacles so that we can efficiently

work around and no longer contribute to the issue.

Any weed population that has resistant weeds will survive the herbicide applications,

which allows these weeds to continue reproducing. Of course, resistant weed biotypes didn’t

occur overnight, since these weeds have undergone an evolutionary process. Resistance is the

outcome of applying the same herbicide chemical repetitively, and if it continues to be repeatedly

used then the resistant weed population will only continue to rise. Once the resistant weed

biotype reproduces, the biology of the seed will be the same, and now the field will only increase

in the resistant biotypes. A little deeper into the situation is that there isn’t even only one type of

resistance, the three being: single herbicide resistance, cross herbicide resistance, and multiple

herbicide resistance. Single resistance is a weed resistant to one herbicide, cross resistance is a

weed resistant to two or more herbicide families with the same mode of action, and multiple

resistance is a weed resistant to two or more herbicides with different mode of action. It is crucial

Weed Science (PLTH 105)

California State University Fresno

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