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 114
- Downloads 0
Integration of pheromone and light traps for mass trapping of leopard moth, Zeuzera Pyrina (Lepidoptera: Cossidae) in walnut orchards
Leopard moth, Zeuzera pyrina L., is a dangerous wood borer pest of the walnut trees in different parts of the world. The larvae bore deep into twigs, branches and trunks, and its chemical, biological and mechanical contr...
Biology of cotton thistle leaf miner, Pegomya terebrans (Diptera: An-thomyiidae) in Urmia region, Iran
Field and laboratory surveys were carried out to study the biology of cotton thistle leaf miner, Pegomya terebrans (Rondani) in Urmia region. The results showed that the host plant species of this fly are restricted to t...
The investigation of lethal and sub-lethal effects of citronellol and neem extraction in control of red citrus mite, Panonychus citri (Acari: Tetranychidae)
Panonychus citri (McGregor) (Acari: Tetranychidae) is an important pest species in the citrus growing world. Due to broad spectrum chemical pesticides applied on citrus orchards pests, P. citri became an important citrus...
Comparing life table parameters of Brachycaudus cardui (Hemiptera: Aphididae) on artichoke under laboratory and semi-field conditions
Life table parameters of Brachycaudus cardui L. (Hemiptera: Aphididae) feeding on the host plant, Cynara scolymus L. (Artichoke) were studied under laboratory (22 ± 1°C, relative humidity of 65 ± 5% and a photoperiod of...
Effect of different nutritional diets on hypopharyngeal glands growth in nurse honey bees
Hypopharyngeal glands (HGs) are one of the most important body organs of nurse honey bees which produce the major protein fraction of royal jelly that is fed to larvae and queen. The HGs mass and acini size can be consid...