The prickly pear weed (Opuntia) became a mena | vedclass

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(D) In $1920s$,the prickly pear cactus $(Opuntia)$ was introduced into Australia,where it spread rapidly into millions of hectares of rangeland. It be

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Cochineal insects

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(D) In $1920s$,the prickly pear cactus $(Opuntia)$ was introduced into Australia,where it spread rapidly into millions of hectares of rangeland. It became a major menace to the local ecosystem and agriculture. It was successfully controlled by the introduction of the cochineal insect $(Cactoblastis cactorum)$,which is a biological control agent that feeds specifically on the $Opuntia$ cactus. This is a classic example of biological control of weeds.

Column $I$ (Pathogen)	Column $II$ (Host)
$a$. $Bacillus$ $papillae$	$i$. $Gypsy$ $moths$
$b$. $Beauveria$ $bassiana$	$ii$. $Cabbage$ $worms$
$c$. $Nosema$ $locustae$	$iii$. $Aphids$
$d$. $Nucleopolyhedroviral$ $virus$	$iv$. $Grasshoppers$

The prickly pear weed $(Opuntia)$ became a menace and it has been successfully controlled by

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