Persistence of Paranosema (Nosema) locustae (Microsporidia: Nosematidae) among grasshopper (Orthoptera: Acrididae) populations in the Inner Mongolia Rangeland,China |
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Authors: | Wang-Peng Shi Yan-Yan Wang Fen Lv Cheng Guo Xu Cheng |
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Affiliation: | (1) Department of Entomology, China Agricultural University, Beijing, 100094, China |
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Abstract: | Paranosema (Nosema) locustae Canning has persisted in grasshopper populations in the Inner Mongolia Rangeland since spore treatment was applied in 1993. In the treatment year, a 58.32–71.43% reduction of grasshoppers was recorded and 59.26–80.36% of surviving grasshoppers of various species were infected. In the years following application, prevalence of P. locustae varied from 13.65% to 60.71%, demonstrating that P. locustae remains in grasshopper populations for many years. Infection prevalence was more than 60.00% for Dasyhippus barbipes (F.-W.), Bryodema luctuosum luctuosoma (Stoll) and Angaracris barabensis (Pall.) in 1993 but was very variable, ranging from 20.00% to 60.71% over the subsequent nine years. Disease prevalence was 43.72–60.71% in 1993 and 1994 for Oedaleus asiaticus B.-Bienko and Myrmeleotettix palpalis (Zub.) but gradually declined to approximately 20%, where it remained. Persistence of P. locustae in grasshopper populations may be important in keeping densities below economic thresholds for a number of years after application. Handling Editor: Helen Roy. |
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Keywords: | Grasshoppers Paranosema (Nosema) locustae Persistence Dasyhippus barbipes Bryodema luctuosum luctuosoma Angaracris barabensis Oedaleus asiaticus Myrmeleotettix palpalis |
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