Which of the following bacteria is associated with bio-insecticides?

Which is a bioinsecticide?

Identify the incorrect statement.
$(i)$ Bacillus thuringiensis are available in sachets as dried spores which are mixed with kerosene and sprayed on to vulnerable plants.
$(ii)$ $B. thuringiensis$ are used to control butterfly caterpillars,but leave other insects unharmed.
$(iii)$ The toxin of $B. thuringiensis$ is released in the blood of larvae and the larvae get killed.
$(iv)$ By the development of methods of genetic engineering,$B. thuringiensis$ toxin genes have been introduced into plants.

$A$ biocontrol agent to be a part of an integrated pest management should be

Trichoderma species,free-living fungi present in root ecosystems,are potentially useful as:

Among pesticides,$Zinc \ phosphide$ is used for: