NOXIOUS WEEDS
CONTROL BY PARASITES "Work in connection with the parasitic control of ragwort, gorse and piripiri has proceeded under considerable disability, due to difficulties experienced in obtaining and transporting to New Zealand supplies of certain parasites," states a section of the annual report of the Cawthron Institute. "In the case oi gorse very satisfactory results have been secured in the establishment of the seed weevil, apiou ulicis. Distribution of the weevil has been made to many parts of New Zealand, and, where well-established, examinations have shown that over 90 per cent of the. gorse seeds have been destroyed by tlie weevil. "11l regard to ragwort, efforts arc being concentrated in securing large supplies of a seed-fly, the larvae of which destroy under laboratory conditions 100 per cent, of the seeds in every flowerhead attacked. For the control of piripiri, a Chilean saw-fly is being used. The saw-fly caterpillar devours voraciously the leaves and flower-bead of the New Zealand species of aeaena, and once, large sunplies of the parasite are available excellent progress in the control of piripiri should lie possible.
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Bibliographic details
Poverty Bay Herald, Volume LXIII, Issue 18975, 27 March 1936, Page 2
Word Count
181NOXIOUS WEEDS Poverty Bay Herald, Volume LXIII, Issue 18975, 27 March 1936, Page 2
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