Journal of Fungi Review Mode of Infection of Metarhizium spp. Fungus and Their Potential as Biological Control Agents Kimberly Moon San Aw and Seow Mun Hue * School of Science, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, 47500 Subang Jaya, Malaysia;
[email protected] * Correspondence:
[email protected]; Tel.: +603-55146116 Academic Editor: David S. Perlin Received: 24 February 2017; Accepted: 1 June 2017; Published: 7 June 2017 Abstract: Chemical insecticides have been commonly used to control agricultural pests, termites, and biological vectors such as mosquitoes and ticks. However, the harmful impacts of toxic chemical insecticides on the environment, the development of resistance in pests and vectors towards chemical insecticides, and public concern have driven extensive research for alternatives, especially biological control agents such as fungus and bacteria. In this review, the mode of infection of Metarhizium fungus on both terrestrial and aquatic insect larvae and how these interactions have been widely employed will be outlined. The potential uses of Metarhizium anisopliae and Metarhizium acridum biological control agents and molecular approaches to increase their virulence will be discussed. Keywords: biopesticide; Metarhizium anisopliae; Metarhizium acridum; biological vectors; agricultural pests; mechanism of infection 1. Introduction Pests such as locusts, grasshoppers, termites, and cattle ticks have caused huge economic and agricultural losses in many parts of the world such as China, Japan, Australia, Malaysia, Africa, Brazil, and Mexico [1–8]. Vectors of malaria, dengue, and Bancroftian filariasis, which are Aedes spp., Anopheles spp., and Culex spp. respectively, have been responsible for hospitalization and death annually [9,10]. To eliminate these pests and vectors, chemical insecticides have been commonly used as the solution.