Trichoderma asperellum
is widely found in plant roots and soil and has been used for the biocontrol of various plant pathogens; however, the control efficiency of
T. asperellum
is usually unstable in field trials. To improve the control efficiency of
T. asperellum
, in the present study,
T. asperellum
microcapsules were prepared using sodium alginate as wall material to reduce the effects of temperature, UV irradiation, and other environmental factors on its activity, and to significantly improve its biocontrol efficiency on cucumber powdery mildew.