6 Current Status of Entomopathogenic Fungi as Mycoinecticides and Their Inexpensive Development in Liquid Cultures Abid Hussain 1,2* , Ming-Yi Tian 1 , Sohail Ahmed 3 and Muhammad Shahid 4 1 Department of Entomology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 2 Department of Arid Land Agriculture, Faculty of Agriculture and Food Sciences, King Faisal University, Hofuf, Al-Hassa, 3 Department of Agricultural Entomology, University of Agriculture, Faisalabad, 4 Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad, 1 China 2 Saudi Arabia 3,4 Pakistan 1. Introduction Synthetic chemical pesticides remained the mainstay of pest eradication for more than 50 years. However, insecticide resistance, pest resurgence, safety risks for humans and domestic animals, contamination of ground water, decrease in biodiversity, and other environmental concerns have encouraged researchers for the development of environmentally benign strategies for pest control including the use of biological control agents. Naturally occurring biological control agents are important regulatory factors in insect populations. Many species are employed as biological control agents of insect pests in glass-house and row crops, orchards, ornamentals, range, turf and lawn, stored products, and forestry and for the abatement of pest and vector insects of veterinary and medical importance (Burges, 1981; Lacey & Kaya, 2000; Tanada & Kaya, 1993). The application of microorganisms for control of insect pests was proposed by notable early pioneers in invertebrate pathology such as Agostino Bassi, Louis Pasteur, and Elie Metchnikoff (Steinhaus, 1956, 1975). These biological control agents such as viruses, bacteria, protozoa, nematodes and most fungi exert considerable control of target populations. Among micro-organisms, entomopathogenic fungi constitute the largest single group of insect pathogens. Generally, two groups of fungi are found to cause diseases in insects. Entomopathogenic fungi belong to the orders Entomophthorales and Hypocreales (formerly called Hyphomycetes). Several other entomopathogenic fungi from other taxonomic groups are also known. Until now, over 700 species of fungi are known to infest insects (Wraight et * Corresponding Author www.intechopen.com