control of the prickly-pears, Opuntia inermis and 0. stricta, in Australia affords one of the most outstanding examples of the application of biological knowledge to economic purpose. It needs to be ...
THE Commonwealth Prickly-Pear Board was instituted in 1920 to study the possibilities of the control of the prickly-pear pest in Australia by means of biological agencies. Previous investigations had ...
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