Show useful parasites ites today the economic use of para elt cit la Is worldwide world wide at fa farahani Farn hani da house bouse there la Is a catalogue of parasites with information about their habits hosts and the countries where they are found instantly available for use ue by the governments 1 1 of the empire A timber pest was recently despoiling the forests ot canada A suitable parasite was sought bought and found in the forests or of europe in 1032 the laboratory shipped to canada 3 03 cocoons of that parasite last icar the exports exceeded four million presumably with correspondingly large benefits to the canadian timber the time may come when so far as its insect friends and enemies are concerned economic vegetation throughout the ij world will be completely under the control of man manchester r eng aig guardian |