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Kali tragus, the Russian thistle Leaves of a mature plant coming into flower, each leaf with one flower and two bracts in its axil. Salsola tragus is an annual forb.In habit, the young plant is erect, but it grows into a rounded clump of branched, tangled stems, each one up to about a metre long.
Weed control is a type of pest control, which attempts to stop or reduce growth of weeds, especially noxious weeds, with the aim of reducing their competition with desired flora and fauna including domesticated plants and livestock, and in natural settings preventing non native species competing with native species.
Carduus crispus, the curly plumeless thistle [1] or welted thistle, [2] is a biennial herb in the daisy family Asteraceae. It is native to Eurasia and has been naturalized in North America and India. It is native to Eurasia and has been naturalized in North America and India.
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Syrphus hoverfly larva (below) feed on aphids (above), making them natural biological control agents. A parasitoid wasp (Cotesia congregata) adult with pupal cocoons on its host, a tobacco hornworm (Manduca sexta, green background), an example of a hymenopteran biological control agent
Ducks have shown substantial resistance to the seeds: it takes an average of 80 to kill them. Poisoning occurs when animals ingest broken seeds or break the seed by chewing; intact seeds may pass through the digestive tract without releasing the toxin. [191] Robinia spp. black locust, false acacia Fabaceae: All species produce toxic lectins. [192]
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The weevil Larinus planus also feeds on the thistle and has been used as a control agent in Canada. [43] One larva of the species can consume up to 95% of seeds in a particular flower bud. [44] However, use of this weevil has had a damaging effect on other thistle species as well, include some that are threatened. [45]
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