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An insect growth regulator (IGR) is a chemical insecticide that kills insects indirectly by disrupting their life cycles. [1] The term was initially proposed to describe the effects of juvenile hormone analogs. [2] Although the term "insect growth disruptor" more accurately describes the actions of IGRs, it did not become widely used. [1]
Used in high doses, auxin stimulates the production of ethylene, also a native plant hormone. Excess ethylene can inhibit elongation growth, cause leaves to fall , and even kill the plant. Some synthetic auxins, such as 2,4-D and 2,4,5-T are marketed also as herbicides.
MCPA acts by mimicking the action of the plant growth hormone auxin, which results in uncontrolled growth and eventually death in susceptible plants, mainly dicotyledons. [3] It is absorbed through the leaves and is translocated to the meristems of the plant. Uncontrolled, unsustainable growth ensues, causing stem curl-over, leaf withering, and ...
Plant hormones affect gene expression and transcription levels, cellular division, and growth. They are naturally produced within plants, though very similar chemicals are produced by fungi and bacteria that can also affect plant growth. [12] A large number of related chemical compounds are synthesized by humans.
Dicamba is a synthetic auxin that functions by increasing plant growth rate, leading to senescence and cell death. [2] [11] The growth regulating properties of dicamba were first discovered by Zimmerman and Hitchcock in 1942. [12] Soon after, Jealott's Hill Experimental Station in England was evaluating dicamba in the field. Dicamba has since ...
Killing your entire lawn gets rid of everything—grassy and broadleaf weeds, off-type lawn grasses, and the few strands of good grass you have left. Unlike the five percent household vinegar used ...
They were discovered in the 1940s after a long study of the plant growth regulator auxin. Synthetic auxins mimic this plant hormone in some way. They have several points of action on the cell membrane, and are effective in the control of dicot plants. 2,4-D, 2,4,5-T, and Aminopyralid are examples of synthetic auxin herbicides.
The first group to be discovered act by mimicking the auxin growth hormone indoleacetic acid (IAA). [1] When sprayed on broad-leaf plants they induce rapid, uncontrolled growth ("growing to death"). Thus when applied to monocotyledonous crops such as wheat or maize (corn), they selectively kill broad-leaf weeds, leaving the crops relatively ...