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When these people were unable to support themselves, they were intoxicated with this herb and then dropped from a high rock or beaten to death. Criminals were also executed in this way. [168] Paris quadrifolia: herb-paris Melanthiaceae: Each plant only produces one blueberry-like berry, which is poisonous, as are other tissues of the plant. [169]
competing with the desired plants for the resources that a plant typically needs, namely, direct sunlight, soil nutrients, water, and (to a lesser extent) space for growth, providing hosts and vectors for plant pathogens, giving them greater opportunity to infect and degrade the quality of the desired plants;
Solanine is a glycoalkaloid poison created by various plants in the genus Solanum, such as the potato plant. When the plant's stem, tubers, or leaves are exposed to sunlight, it stimulates the biosynthesis of solanine and other glycoalkaloids as a defense mechanism so it is not eaten. [12] It is therefore considered to be a natural pesticide.
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.
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The word pesticide derives from the Latin pestis (plague) and caedere (kill). [5]The Food and Agriculture Organization (FAO) has defined pesticide as: . any substance or mixture of substances intended for preventing, destroying, or controlling any pest, including vectors of human or animal disease, unwanted species of plants or animals, causing harm during or otherwise interfering with the ...
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In plants, injuries result from the eating of plant parts by herbivorous animals including insects and mammals, [10] from damage to tissues by plant pathogens such as bacteria and fungi, which may gain entry after herbivore damage or in other ways, [11] and from abiotic factors such as heat, [12] freezing, [13] flooding, [14] lightning, [15 ...