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2022 Volume 1 Issue 3
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REN Limei, SU Zhengqin, OU Da, et al. Pathogenicity Evaluation of Two Isaria strains for Whitefly Bemisia tabaci Biological Control[J]. PLANT HEALTH AND MEDICINE, 2022, (3): 86-93. doi: 10.13718/j.cnki.zwyx.2022.03.013
Citation: REN Limei, SU Zhengqin, OU Da, et al. Pathogenicity Evaluation of Two Isaria strains for Whitefly Bemisia tabaci Biological Control[J]. PLANT HEALTH AND MEDICINE, 2022, (3): 86-93. doi: 10.13718/j.cnki.zwyx.2022.03.013
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Pathogenicity Evaluation of Two Isaria strains for Whitefly Bemisia tabaci Biological Control

  • 1. National Demonstration Center for Experimental Plant Science Education, College of Agriculture, Guangxi University, Nanning 530004, China;

  • 2. Engineering Research Center of Biological Control, Ministry of Education, Guangzhou 510642, China;

  • 3. Chongqing Key Laboratory of Vector Insects, Chongqing Normal University, Chongqing 401331, China

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  • Received Date: 01/06/2022

  • MSC: S435.72

  • Bemisia tabaci is a serious agricultural pest across the world. Entomopathogenic fungi, being an important external control factor of natural ecological regulation, can effectively reduce the number of pests through infection of insect thus showing an ideal control effect. This study investigated the pathogenicity of two Isaria strains, I. javanica GZQ-1 and I. fumosorosea YMS01, against the Middle East-Asia Minor (MEAM1) cryptic species of B. tabaci. The results showed that both strains can infect all the life stages of Bemisia tabaci and virulence was enhanced in a dose depend manner. The pathogenicity of I. javanica GZQ-1 and I. fumosorosea YMS01 (when the concentration was 1×108 conidia/mL) to the 2nd instar nymphs of B. tabaciwas 92.68% and 78.12%, respectively, theregression equations for I. javanica GZQ-1 and I. fumosorosea YMS01 pathogenicity werey=0.421 x-1.665, y=0.33 x-1.646, respectively. The median lethal concentration (LC50) of I. javanica GZQ-1 and I. fumosorosea YMS01 to the 2nd instar nymphs were 9.01× 103 and 9.74 × 104 conidia/mL, respectively, while their median lethal time (LT50) values to whitefly were 3.051 days and 4.557 days, respectively. In summary, the two Isaria strains used in current experiment can be excellent biological control agents of B. tabaci, and the pathogenic potential of I. javanica GZQ-1 was higher than I. fumosorosea YMS01. These results will improve the overall knowledge on application of entomopathogenic fungi forbiological control of B. tabaci.
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Pathogenicity Evaluation of Two Isaria strains for Whitefly Bemisia tabaci Biological Control

  • Received Date: 01/06/2022

Abstract: Bemisia tabaci is a serious agricultural pest across the world. Entomopathogenic fungi, being an important external control factor of natural ecological regulation, can effectively reduce the number of pests through infection of insect thus showing an ideal control effect. This study investigated the pathogenicity of two Isaria strains, I. javanica GZQ-1 and I. fumosorosea YMS01, against the Middle East-Asia Minor (MEAM1) cryptic species of B. tabaci. The results showed that both strains can infect all the life stages of Bemisia tabaci and virulence was enhanced in a dose depend manner. The pathogenicity of I. javanica GZQ-1 and I. fumosorosea YMS01 (when the concentration was 1×108 conidia/mL) to the 2nd instar nymphs of B. tabaciwas 92.68% and 78.12%, respectively, theregression equations for I. javanica GZQ-1 and I. fumosorosea YMS01 pathogenicity werey=0.421 x-1.665, y=0.33 x-1.646, respectively. The median lethal concentration (LC50) of I. javanica GZQ-1 and I. fumosorosea YMS01 to the 2nd instar nymphs were 9.01× 103 and 9.74 × 104 conidia/mL, respectively, while their median lethal time (LT50) values to whitefly were 3.051 days and 4.557 days, respectively. In summary, the two Isaria strains used in current experiment can be excellent biological control agents of B. tabaci, and the pathogenic potential of I. javanica GZQ-1 was higher than I. fumosorosea YMS01. These results will improve the overall knowledge on application of entomopathogenic fungi forbiological control of B. tabaci.

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