Efficiency of two conventional sampling methods and spatial distribution pattern of the soybean stem fly, Melanagromyza sojae (Diptera: Agromyzidae) in soybean field
Keywords:
Chi-square goodness-of-fit, Melanagromyza sojae, Relative variation, Soybean stem flyAbstract
Relative efficiency of direct observation, and sweep sampling methods for soybean stem fly, Melanagromyza sojae (Zehntner) adults were evaluated by relative variation (RV) criteria in soybean field. The mean RV obtained from the direct observation yielded lower RV than the sweep net method and adequately for extensive sampling program. Periodic sampling of the adult flies between October 2019 and March 2020 at 3rd and 4th week after planting revealed that M. sojae produced the greatest number of adults in November and declined in January but increased again during February through March. There was a positive correlation between adult populations of M. sojae and the levels of infestation of plants. The observed and expected frequency distributions of immature stages among 2,400 plants were tested by a Chi-square goodness-of-fit test. The results indicated that M. sojae populations are not randomly and independently dispersed among their host plants.
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