| 21. | Areas with large amounts of shade or high levels of water discourage diffuse knapweed growth.
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| 22. | Various colour-forms of greater knapweed may be found as well as common twayblade.
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| 23. | The parasitic knapweed broomrape ( " Orobanche elatior " ) is regularly recorded.
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| 24. | Nevertheless, knapweed control is better when the moth works in tandem with other insects.
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| 25. | As a result, diffuse knapweed is able to establish more predominantly in this new area.
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| 26. | It lives on spotted and diffuse knapweed and has not been found to damage other plants.
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| 27. | It was first released as a knapweed biocontrol in the United States in 1991 from Greece.
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| 28. | In drier grassland areas, there is common knapweed, agrimony and ox-eye daisy.
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| 29. | A native to Eurasia, Russian knapweed was introduced into North America in the late 19th century.
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| 30. | Greater knapweed is found growing in dry grasslands, hedgerows and cliffs on lime-rich soil.
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