In 1992 a parasitoid native to Australia was introduced into California in a biological control program directed against the blue gum psyllid from Australia. Interviews with baby blue gum eucalyptus growers indicate that this program has had a benefit-cost ratio ranging from at least 9: 1 to 24: 1, based solely on the reduction of insecticide treatments. Additional economic benefits, including greater foliage yield, possible reduced environmental and health effects, and avoided pesticide resistance, were not calculated, but would further increase this ratio. ' Processing eucalyptus shoots for market. Insecticide sprays were expensive and unreliable for protecting the ornamental crop from blue gum psyllid.
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