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biological control
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(Top) Area in Queensland, Australia, covered with prickly pear cactus (Opuntia stricta), which had expanded rapidly after being introduced in 1926. (Bottom) The same area three years later (1929) after the cactus moth (Cactoblastis cactorum) was introduced as a biological control agent for the cactus.
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Photos

(Top) Area in Queensland, Australia, covered with prickly pear cactus (Opuntia stricta), which had expanded rapidly after being introduced in 1926. (Bottom) The same area three years later (1929) after the cactus moth (Cactoblastis cactorum) was introduced as a biological control agent for the cactus.
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Leland Ossian Howard
American entomologist