Which of the following statements is correct?
(i) Baculoviruses are considered best members for species-specific, short-spectrum insecticide applications.
(ii) Bacillus thuringiensis is used to control butterfly caterpillars.
(iii) Use of ladybirds is very beneficial in getting rid of mosquitoes.
(iv) Trichoderma fungi are used in the treatment of diseased animals under biocontrol.