What is HT crops?

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Plus, can you get the meaning of "Herbicide toxicity may soon be negatively affected"? The herbicide refers to glyphosate? Why would the introduction of crops tolerant to the herbicides dicamba and 2,4-D affect it negatively?

Context:
1.Over the first 15 years of commercial use, GE seeds have not been shown to increase yield potentials of the varieties. In fact, the yields of herbicide-tolerant or insect-resistant seeds may be occasionally lower than the yields of conventional varieties…
2.The fact that several researchers found no significant differences between the net returns of adopters and nonadopters of HT crops (particularly HT soybeans) despite the rapid adoption of these crops suggests that many adopters may derive nonmonetary benefits from HT adoption.
3.Herbicide (Roundup) use on GMO corn increased from around 1.5 pounds per planted acre in 2001 to more than 2.0 pounds per planted acre in 2010. Herbicide use on non-GMO corn has remained relatively level during that same time frame, the ERS said.
4.Herbicide toxicity may soon be negatively affected (compared to glyphosate) by the introduction (estimated for 2014) of crops tolerant to the herbicides dicamba and 2,4-D.

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Type: Question • Score: 3 • Views: 764 • Replies: 5

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HT = Herbicide tolerant.

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oristar wrote:

Why would the introduction of crops tolerant to the herbicides dicamba and 2,4-D affect it negatively?

HT crops are intended to be sprayed concomitantly with herbicides.

However, it has been observed that weeds tend to develop an increasing resistance to pesticides.

So, HT crops impact negatively the efficiency of pesticides, inducing a much higher use of them.

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@timur,

Good answer. So apparently the weeds adapt themselves, carry out their own genetic modification by natural means?
So the expected advantages of GM seed is negated?
How ironic.
And expensive.

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@timur,

timur wrote:

oristar wrote:
Why would the introduction of crops tolerant to the herbicides dicamba and 2,4-D affect it negatively?

HT crops are intended to be sprayed concomitantly with herbicides.

However, it has been observed that weeds tend to develop an increasing resistance to pesticides.

So, HT crops impact negatively the efficiency of pesticides, inducing a much higher use of them.

I think the pesticides should be herbicides.
But what does the word "introduction" exactly mean there? Don't they (Monsanto and others) use Roundup to remove weeds, not dicamba and 2,4-D?

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@McTag,

McTag wrote:

Good answer. So apparently the weeds adapt themselves, carry out their own genetic modification by natural means?
So the expected advantages of GM seed is negated?
How ironic.
And expensive.

See the report "Genetically Engineered Crops in the United States" released by USDA in February 2014 :

USDA’s criticisms:

1.Over the first 15 years of commercial use, GE seeds have not been shown to increase yield potentials of the varieties. In fact, the yields of herbicide-tolerant or insect-resistant seeds may be occasionally lower than the yields of conventional varieties…
2.The fact that several researchers found no significant differences between the net returns of adopters and nonadopters of HT crops (particularly HT soybeans) despite the rapid adoption of these crops suggests that many adopters may derive nonmonetary benefits from HT adoption.
3.Herbicide (Roundup) use on GMO corn increased from around 1.5 pounds per planted acre in 2001 to more than 2.0 pounds per planted acre in 2010. Herbicide use on non-GMO corn has remained relatively level during that same time frame, the ERS said.

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What is HT crops?

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