The invention relates to an application of a
Metarhizium anisopliae CQMa421 strain in preparation of insecticide for preventing and controlling Striped
flea beetle or
plutella xylostella. The strain is capable of infecting Striped
flea beetles and
plutella xylostella with fatality rates being 60.9% and 70.8% respectively. The
Metarhizium anisopliae CQMa421 strain with enhanced
toxicity, which is prepared according to a method disclosed by the invention, has a fatality rate reaching 100% and achieves an outstanding prevention and
control effect. The insecticide for preventing and controlling Striped
flea beetles or
plutella xylostella comprises dry conidial
powder of
Metarhizium anisopliae CQMA421 (44-60%), kieselguhr (30-40%), nano-aluminum trihydrate (0.5-1%),
sodium carboxymethylcellulose (3-5%), tween-80 (3-5%) and OP-10 (3-5%). All the components in the
Metarhizium anisopliae insecticide are matched effectively to take a synergistic effect. After being mixed with water, the
Metarhizium anisopliae insecticide is applied in a spraying way to achieve a field prevention effect of 80% or above for rice
planthopper. The
Metarhizium anisopliae insecticide has excellent
wetting dispersion characteristic, wherein the
wetting time is less than 60s; and in addition, the bioactivity during long-term storage can be retained and the storage time is as long as 12 months.