caa a22 4500 397570805 CHVBK 20180308164840.0 cr unu---uuuuu 161202e19960401xx s 000 0 eng 10.1093/ee/25.2.481 doi (NATIONALLICENCE)oxford-10.1093/ee/25.2.481 Virulence of Seven Isolates of Beauveria bassiana and Metarhizium anisopliae to Coptotermes formosanus (Isoptera: Rhinotermitidae) [Elektronische Daten] [Wendy E. Jones, J. Kenneth Grace, Minord Tamashiro] Three strains of Metarhizium anisopliae (Metschnikoff) Sorokin and 4 strains of Bearweria bassiana (Balsamo) Vuillemin were evaluated for potential use as remedial control agents against Coptotermes formosanus Shiraki. The 7 isolates were screened for relative pathogenicity, and the median lethal time eliciting 50% mortality (LT50) was calculated. In general, the M. anisopliae strains were more virulent, with lower LT50 values, than were the B. bassiana strains. However, B. bassiana strain 787 also showed a high level of virulence. The LT50 values ranged from 0.13 to 4.5 d. Determination of the median lethal concentration required to achieve 50% mortality (LC50) with the remaining 6 isolates showed that B. bassiana strain 787 had the lowest LC50 value but was closely followed by all 3 M. anisopliae strains. The LC50 values for 4 of the isolates ranged from 33 to 40 conidia per termite. The isolates were tested for transmissibility and survivorship under simulated nest conditions. Termite workers dusted with dry conidia (6 × 105 to 2.4 × 107 conidia per termite) were capable of transmitting the pathogen to other colony members. The isolates differed in their inoculum potential, rate of mortality, and response by other workers to fungus-killed cadavers. However, all isolates showed the ability to grow, sporulate, and produce mycosis under these artificial conditions, indicating the potential for causing an epizootic in treated nests. Based on these results, B. bassiana strain 787 was thought to possess the highest potential as a remedial control agent for C. formosanus because of the moderately low LT50 value of 2.9 d and the low LC50 value of 33 conidia per termite in combination with its transmissibility and performance in nesting material. © 1996 Entomological Society of America Physiological and Chemical Ecology nationallicence Coptotermes formosanus nationallicence Metarhizium nationallicence Beauveria nationallicence microbial control nationallicence entomopathogenic fungi nationallicence termite control nationallicence Jones Wendy E. Department of Entomology, University of Hawaii at Manoa, 3050 Maile Way, Honolulu, HI 96822-2271 aut Grace J. Kenneth Department of Entomology, University of Hawaii at Manoa, 3050 Maile Way, Honolulu, HI 96822-2271 aut Tamashiro Minord Department of Entomology, University of Hawaii at Manoa, 3050 Maile Way, Honolulu, HI 96822-2271 aut Environmental Entomology Oxford University Press 25/2(1996-04-01), 481-487 0046-225X 25:2<481 1996 25 ee https://doi.org/10.1093/ee/25.2.481 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.2.481 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jones Wendy E. Department of Entomology, University of Hawaii at Manoa, 3050 Maile Way, Honolulu, HI 96822-2271 aut NATIONALLICENCE 700 1- Grace J. Kenneth Department of Entomology, University of Hawaii at Manoa, 3050 Maile Way, Honolulu, HI 96822-2271 aut NATIONALLICENCE 700 1- Tamashiro Minord Department of Entomology, University of Hawaii at Manoa, 3050 Maile Way, Honolulu, HI 96822-2271 aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/2(1996-04-01), 481-487 0046-225X 25:2<481 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford