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This paper investigates 71 isolates of two genera of entomopathogens,  Metarhizium  and  Beauveria , and a biostimulative genus  Trichoderma , for their ability to infect yellow mealworms ( Tenebrio molitor ) and to stimulate maize ( Zea mays ) growth. Fungal origin, host, and isolation methods were taken into account in virulence analysis as well. Isolates  Metarhizium brunneum  (1154) and  Beauveria bassiana  (2121) showed the highest mortality (100%) against  T. molitor . High virulence seems to be associated with fungi isolated from wild adult mycosed insects, meadow habitats, and Lepidopteran hosts, but due to uneven sample distribution, we cannot draw firm conclusions.  Trichoderma atroviride  (2882) and  Trichoderma gamsii  (2883) increased shoot length, three  Metarhizium robertsii  isolates (2691, 2693, and 2688) increased root length and two  M. robertsii  isolates (2146 and 2794) increased plant dry weight. Considering both criteria, the isolate  M. robertsii  (2693) was the best as it caused the death of 73%  T. molitor  larvae and also significantly increased maize root length by 24.4%. The results warrant further studies with this isolate in a tri-trophic system.

plants

Testing Virulence of Different Species of Insect Associated Fungi against Yellow Mealworm (Coleoptera: Tenebrionidae) and Their Potential Growth Stimulation to Maize