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
Abstract
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
Keywords
Related Articles
- EP ID EP706319
- DOI 10.22117/JESI.2021.355128.1420
- Views 75
- Downloads 0
Population growth model of the carob moth, Ectomyelois ceratoniae (Lepidoptera: Pyralidae) under field conditions
The carob moth, Ectomyelois ceratoniae Zeller, is the most important pest on pomegranate fruits and has several overlapping generations per year in Iran. This paper investigated the use of a mechanistic model for descr...
Spatial distribution pattern of Spodoptera exigua (Lepidoptera: Noctuidae) on sugar beet and advantage of site-specific spraying in the pest management
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. Ph...
Study on the possibility of mass rearing of Sesamia nonagrioides (Lepidoptera: Noctuidae) feeding on semi-artificial diet
The stem borers, Sesamia spp. (Lepidoptera: Nocuidae) are the most important pest insects on sugarcane and maize in Iran. Biological control using its egg parasitoid wasp, Telenomus busseolae Gahan, is the main recommend...
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...
Biological indices of the entomopathogenic fungi, Beauveria bassiana and Metarhizium anisopliae, and assessment of their virulence diversity
Biological indices such as conidial morphology, germination, and surface characteristics influence the virulence of an isolate. Therefore, the growth indices (vegetative growth, conidiogenesis, and germination), hydropho...