However the insect numbers were decreased progressively and disappeared from the field they increased extremely to reach 32.4 and 50.8 larvae per 10 leaves of chard and sugar beet plants respectively during April 2013. The results showed that few number of the insect was found during September, and then the number was increased gradually to reach their maximums which were 33 and 42.4 larvae per 10 leaves of chard and sugar beet plants respectively. exigua across different climate zones.A field experiment was conducted in Erbil city to study seasonal abundance, host plants and bio enemies of beet armyworm Spodoptera exigua (Hub.) on sugar beet and chard during 2013Ģ014 season. These findings provide a good starting point for study of the trans-regional migration of S. The majority of trapped females in summer were mated (94.4 ± 10.7% in June, 80.0 ± 6.4% in July) and sexually mature (88.9 ± 11.1% in June, 61.8 ± 12.3% in July), suggesting the onset of mating and/or sexual maturation does not terminate the migration behavior in this species. The sex ratio (females: males) was significantly less than 1:1 in each month, but the proportion of females showed an upward trend from June to October. The mean time from the earliest trap capture to the latest capture within a given year was 113 ± 22 d (range 57 d to 138 d ). exigua one of the most frequently encountered species in that period. exigua moths being trapped in August and September, (81.1 ± 3.6%), making S. In addition, nightly catches exhibited a significant inter-month variability, with the vast majority of S. We found that the population size of this overseas migration varied significantly among years, with very large migrations in 2005, 2007, 2009, and 2014 that resulted in annual total catches of more than ten thousand individuals. Here, we present data from 14-years of monitoring on a small remote island located in the center of the Bohai Strait, in northern China, by means of searchlight trapping and ovarian dissection. However, what pattern of seasonal migration this species exhibits in regions where it cannot overwinter (i.e., the ‘summer breeding region’) remains unknown. This species is known as a long-distance migrant, and previous studies on its migration have been mostly carried out in regions where it can overwinter. The beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), is a serious polyphagous insect pest worldwide.
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