Study on geographical distribution and population density of Stenopelmus rufinasus Gyllenhal, in paddy fields and aquatic ecosystems in northern Iran

Document Type : Paper, Persian

Authors

1 Department of Plant Protection, Rice Research Institute of Iran, (AREEO), Rasht, Iran

2 Department of Plant Protection, Rice Research Institute of Iran, (AREEO), Amol, Iran

10.61186/jesi.43.3.6

Abstract

Azolla (Azolla spp.: Salviniaceae) is an aquatic fern that was introduced to the northern region of Iran with the aim of increasing the fertility of paddy fields, but due to suitable climatic conditions and the absence of natural enemies it became a problem in rice production and a destructive factor in aquatic ecosystems. In recent years, the biological control agent of this weed, Azolla weevil Stenopelmus rufinasus Gyllenhal (Curculionidae), was introduced in northern region of Iran. In this study, geographical distribution and seasonal population density of S. rufinasus in northern Iran were investigated through regular monthly sampling. The results showed that the time required to complete one generation in semi-field conditions is about two weeks. Both larvae and adults feed on Azolla. Azolla weevil is well distributed and established in the north regions of Iran and by feeding on Azolla, it has reduced its population in wetlands, permanent ponds and paddy fields. Comparing the population density of the weevil in three regions of Guilan province, indicated that the highest number of total density (667 insect in 1 kg Azolla) and adult (363 adults in 1 kg Azolla) belong to the central region of the province, while the density of larvae (397 larvae in 1 kg Azolla) in the eastern region of the province was higher than other regions. In the survey of the density in different cities, the highest density of total (2690 adults and larvae in 1 kg Azolla) and adult insects (2022 adults in 1 kg Azolla) was observed in Shaft city and the highest density of larvae (1920 larvae in 1 kg Azolla) was observed in the Rudbane of Lahijan. Based on the obtained results, the population density of the weevil is higher in spring and winter, which is not far from the mind considering the climatic conditions of the region and the sensitivity of Azolla to heat and low humidity. Based on the findings of this survey, the weevil has spread and settled well in the northern regions

Graphical Abstract

Study on geographical distribution and population density of Stenopelmus rufinasus Gyllenhal, in paddy fields and aquatic ecosystems in northern Iran

Keywords

Main Subjects

© 2023 by Author(s), Published by the Entomological Society of Iran

This Work is Licensed under Creative Commons Attribution-Non Commercial 4.0 International Public License.

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Journal of Entomological Society of Iran
Volume 43, Issue 3
August 2023
Pages 259-273

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