Population Dynamics and Life History of Locusta migratoria tibetensis Chen in Lhasa River
Population Dynamics and Life History of Locusta migratoria tibetensis Chen in Lhasa River
Bhandari Jyoti1,2, Yasen Shali3, Zhang Zehua4, Yao Xiaoho5, Deng Jiang3, Zhang Yaling5, Wang Cuiling5, Li Yang5, Lei Xueping5, Wang Wenfeng5, Mohammad Farooque Hassan6 and Li Can1,*
ABSTRACT
The Locusta migratoria tibetensis Chen is one of the most destructive pests in Tibetan region. To effectively control their spreading, a clear understanding on the species traits is necessary. In this study, the population dynamics, life history and spatial distribution pattern of L. m. tibetensis Chen were explored on meadow and farmland of the Tibetan plateau during 2012. The first objective of this study was to investigate the population dynamic and life history of this pest on their outbreak sites. The second objective was to analyze the spatial distribution pattern of L. m. tibetensis Chenon both meadow and farmland. The lowest and highest population densities in meadow were recorded in early May and mid June respectively whereas in farmland lowest was recorded in late June and highest was in early June. The average population density in meadow was 3.1 m-2 and in farmland was 4.52 m-2. Reproduction takes place during summer (June/July), generating two incomplete generations a year in meadow and one generation a year in farmland. The Iwao’s M*-m regression analysis, Taylor’s power law and aggregation cause analysis showed an aggregated distribution pattern for L. m. tibetensis Chen. It is concluded that insect behavior and environmental conditions co-influence the population density and spatial distribution pattern of this pest.
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June 2020
Vol. 52, Iss. 3, Pages 825-1224
