Control of Prickly Pear by the Cochineal Insect.

  title={Control of Prickly Pear by the Cochineal Insect.},
  author={W. B. Alexander},
AS a result of a long series of tests carried out in Australia under the Commonwealth Prickly Pear Board, it was ascertained that the cochineal insect, Dactylopius tomentosus, could only live on certain species of Opuntia, among which was O. dillenii. As this species was reported to be a pest in India and Ceylon, I was authorised to offer strains of this cochineal bred in the laboratory free from parasites to the Government entomologists of those countries. The offer was accepted by Ceylon, and… 
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Control of Prickly-Pear by the Cochineal Insect.

I HAVE read with interest the communications of Messrs. C. T. Jacob1 and W. B. Alexander 2 on this subject. Referring to the introduction of the cochineal insect into India, the latter remarks : “In

‘Plants out of place’: The ‘noxious weeds’ eradication campaign in colonial south India

The spread of transferred plants such as the prickly pear and lantana, labelled ‘noxious weeds’ in late nineteenth- and early twentieth-century south India, and the exploration of viable means for