Identify the incorrect statement.
(i) Bacillus thuringiensis are available in sachets as dried spores which are mixed with kerosine and sprayed on to vulnerable plants
(ii) B. thuringiensis are used to control butterfly cateropillars, but leave other insects unharmed
(iii) The toxin of B. thuringiensis is rleased 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.