Study of diversity of natural enemies of Leptinotarsa decemlineata Say and damage caused by the pest in the strip cropping system of potato and sainfoin

Mahmoudi-Anzabi, Davod (2017) Study of diversity of natural enemies of Leptinotarsa decemlineata Say and damage caused by the pest in the strip cropping system of potato and sainfoin. Masters thesis, University of Mohaghegh Ardabili.

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Text (مطالعه تنوع گونه¬ای دشمنان طبیعی سوسک ‌کلرادوی سیب¬زمینی، Leptinotarsa decemlineata Say و میزان خسارت این آفت در سیستم کشت نواری سیب¬زمینی و اسپرس) Davod Mahmoudi-Anzabi.pdf Download (509kB) | Preview

Abstract

In this study, the density of the Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say), and species diversity of its predators were studied in three strip cropping systems (including three rows potato with three rows sainfoin, six rows potato with three rows sainfoin, and nine rows potato with three rows sainfoin) along with potato monoculture in Ardabil region during 2016. Among the tested treatments, the lowest densities of CPB eggs, larvae and adults were observed in three rows potato with three rows sainfoin teatment. Among the CPB predators on potato foliage, Chrysoperla carnea (Stephens) and Coccinellids (including Hipodamia convergens Guernmenevelle, Coccinella septempunctata (L.) and Hippodamia variegate (Goeze)) had the highest percentage of relative abundance. The abundance of these predators (C. carnea and coccinellids) in three rows potato with three rows sainfoin were significantly higher than on potato monoculture, but there was no significant difference was observed between three intercrops. Moreover, the highest value of Shannon diversity index (H’) for these predators was recorded in three rows potato with three rows sainfoin treatment. Moreover, in this research, terrestrial predator species of L. decemlineata including one species Opiliones, spiders and carabid beetles were collected using pitfall trap and identified. The value of Shannon diversity index for terrestrial predators in each of three intercrops was significantly higher than in monoculture. The lowest value of Morisita-Horn index was recorded between three rows potato with three rows sainfoin and monoculture, and the highest value was found between three and six rows potato with three rows sainfoin. Moreover, the lowest and the highest percentage of fresh tubers weight loss was recorded in three rows potato with three rows sainfoin and potato monoculture, respectively. Therefore, it can be concluded that amongst the four cropping systems three rows potato with three rows sainfoin intercrop with increasing of CPB predator’s diversity and decreasing of CPB density could be useful in integrated management of CPB in potato fields.

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