Report of the Prickly-Pear Travelling Commission. 1st November, 1912-30th April, 1914
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cucurbita', on rough squash; and I. manihot, forming small leaf -scales on Cassava. Cecidomyiids formed swellings on twigs, galls in or on leaves, &c., and sometimes injured terminal buds, but, as a rule, they did not destroy plants. The Hessian fly and sorghum midge were exceptions. He concurred with the Commission in con- cluding that whatever injury to the prickly-pear accompanied the presence of Itonida opuntim was most probably due to the action of fungoid or bacterial organisms whose pres...ence and development were made possible by the insect attacks, simple galls being formed, but no further lesions or abnormalities being caused in the absence of these organisms. Influenced by these and other general con- siderations he remarked that he did not see how anything adverse could develop from these insects when in Australia, and that faced by a similar problem to that which confronted the Commis- sion he would not hesitate at all in attempting to establish it there. At the same time, he could not definitely predict any advantageous outcome resulting from such procedure, since it was a matter for experiment.
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