Spatial distribution pattern of Spodoptera exigua (Lepidoptera: Noctuidae) on sugar beet and advantage of site-specific spraying in the pest management

Journal Title: Journal of Entomological Society of Iran - Year 2021, Vol 41, Issue 2


Spodoptera exigua (Hübner) is a destructive insect pest of sugar beet globally. In this study, we utilized some geostatistical techniques to locate sample points and determine spatial distribution pattern of the pest. Pheromone traps were used to predict accurate time of oviposition and visual sampling was used to determine larval density. In order to predict the population density at non-sampled locations, Inverse Distance Weighting (IDW) and Ordinary Kriging (OK) techniques were used. The densities of different developmental stages of S. exigua were estimated weekly during August and September, 2016. The degree dependence values of S. exigua eggs in majority of dataset were larger than 76%, indicating their clumped distribution and strong spatial autocorrelation. Broadcast spraying was used when the density of the larvae in tracts overpassed the economic threshold. Also, we applied site-specific spraying to grid cells when larval densities were above the economic threshold. In most cases, larval mortality was not significantly different between broadcast spraying and site-specific spraying methods. Comparing two interpolation methods indicated that the data calculated for density of larvae and eggs of S. exigua were fitted better with OK model than IDW one. The findings of this research would be useful to develop sampling programs and to control S. exigua in Iran.

Authors and Affiliations

Javad Salmani-Moghanlou, Orouj Valizadegan, Bahram Naseri


Related Articles

First report of the fungus-feeding thrips, Phlaeothrips annulipes (Thysanoptera: Phlaeothripidae) from Iran

Globally, Phlaeothripidae is the largest family of Thysanoptera that at least 50% of its species are fugus-feeding (ThripsWiki, 2021). However, for various reasons (see Minaei 2013), the number of species recorded in t...

Nutritional indices and digestive proteolytic and amylolytic activities of Trogoderma granarium (Coleoptera: Dermestidae) on seed of different cereals

The khapra beetle, Trogoderma granarium (Everts), 1898 is one of the damaging pests of different stored cereal grains in Iran. In this research, effect of four cereal grain species including wheat (varieties N-91-9 and A...

First description of the male Solter iranensis Hölzel (Neuroptera: Myrmeleontidae) from Iran

During a study of antlions housed in Hayk Mirzayans Insect Museum, the specimens of genus Solter examined and identified as S. iranensis. The species described based on a female specimen that collected from Derbend, Tehr...

First record of Schizoprymnus rimosus(Hym: Braconidae) from Iran

During faunistic survey of parasitoid wasps in Ardabil province at 2019-2020, a parasitoid species from Braconidae was collected.The parasitoid wasp identified as Schizoprymnus rimosus Tobias, 1966 and confirmed by Dr....

First report of Campoplex difformis (Gmelin, 1790) associated with the parasitoid wasps fauna of Iran

A solitary endoparasitoid of the larva of Gelechidae and probabely Scorbipalpa ocellatella Boyd. (beet moth) (Lep.: Gelechidae) in Hamedan province, Iran, Campoplex difformis (Gmelin, 1790), belonging to the subfamily Ca...

Download PDF file
  • EP ID EP706319
  • DOI 10.22117/JESI.2021.355128.1420
  • Views 69
  • Downloads 0

How To Cite

Javad Salmani-Moghanlou, Orouj Valizadegan, Bahram Naseri (2021). Spatial distribution pattern of Spodoptera exigua (Lepidoptera: Noctuidae) on sugar beet and advantage of site-specific spraying in the pest management. Journal of Entomological Society of Iran, 41(2), -.