Work on the biological control of St. John's wort was continued in Australia during the three years ending 30th June, 1949. Chrysomela hyperici Forst. and C. quadrigemina Suffr. (gemellata Rossi) continued to make excellent progress in the parts of Victoria, New South Wales and South Australia in which they were established against it, both being present in some. C. hyperici was liberated in Western Australia for the first time in November 1947 and made satisfactory progress during 1948-49.