A comparison of the insecticidal properties of New Zealand native and other plants
type: CreativeWork
description: Economically important plant species were selected from three different countries: New Zealand (12 species), Chile (11 species) and Australia (1 species). They were screened for insecticidal properties against the economically important insect pests: the lightbrown apple moth (LBAM) (Epiphyas postvittana walker), the tropical armyworm (TAW) (Spodoptera litura F.) and the pea aphid (PA) (Acyrthosiphon pisum Harris). The LBAM is a serious pest of fruits and ornamental crops in Australia and New Zealand. The TAW is a tropical and subtropical pest. The pea aphid is a cosmopolitan pest of leguminous crops and also a virus vector. Dichloromethane and methanol extracts of different plant parts (leaves, bark, seeds and fruits) were tested. Forty plant extracts were screened for antifeedant activity against LBAM and TAW, using artificial diet squares in a two-way choice test. A feeding index (FI = (C-T / C+ T) X 100) was used, in which C = the mean weight of control squares eaten and T = the mean weight of treated squares eaten. 13 plant extracts had strong antifeeding activity against LBAM larvae and one plant extract against TAW. A strong deterrent effect from the leaf extracts of Dysoxylum spectabile towards LBAM (FI = + 89 %) and TAW (FI = + 71 %) and seed extracts of Azadirachta indica towards LBAM (FI = + 95 %) was recorded. In contrast, three plant extracts from Chilean Nothofagus species acted as feeding stimulants against LBAM larvae. Thirty-nine plant extracts were screened for settling and reproduction effects on pea aphid adults, using a choice and a no-choice bioassay. Leaf extracts of two New Zealand and six Chilean Nothofagus species greatly reduced aphid settling. Bark extracts from six Chilean Nothofagus species significantly reduced aphid settling. N. glauca (bark) and N. alessandri (leaf) greatly reduced aphid settling by 61 % and 67 %, respectively, compared with controls. Five extracts from New Zealand and 12 from Chilean Nothofagus species significantly…
abstract: Economically important plant species were selected from three different countries: New Zealand (12 species), Chile (11 species) and Australia (1 species). They were screened for insecticidal properties against the economically important insect pests: the lightbrown apple moth (LBAM) (Epiphyas postvittana walker), the tropical armyworm (TAW) (Spodoptera litura F.) and the pea aphid (PA) (Acyrthosiphon pisum Harris). The LBAM is a serious pest of fruits and ornamental crops in Australia and New Zealand. The TAW is a tropical and subtropical pest. The pea aphid is a cosmopolitan pest of leguminous crops and also a virus vector. Dichloromethane and methanol extracts of different plant parts (leaves, bark, seeds and fruits) were tested. Forty plant extracts were screened for antifeedant activity against LBAM and TAW, using artificial diet squares in a two-way choice test. A feeding index (FI = (C-T / C+ T) X 100) was used, in which C = the mean weight of control squares eaten and T = the mean weight of treated squares eaten. 13 plant extracts had strong antifeeding activity against LBAM larvae and one plant extract against TAW. A strong deterrent effect from the leaf extracts of Dysoxylum spectabile towards LBAM (FI = + 89 %) and TAW (FI = + 71 %) and seed extracts of Azadirachta indica towards LBAM (FI = + 95 %) was recorded. In contrast, three plant extracts from Chilean Nothofagus species acted as feeding stimulants against LBAM larvae. Thirty-nine plant extracts were screened for settling and reproduction effects on pea aphid adults, using a choice and a no-choice bioassay. Leaf extracts of two New Zealand and six Chilean Nothofagus species greatly reduced aphid settling. Bark extracts from six Chilean Nothofagus species significantly reduced aphid settling. N. glauca (bark) and N. alessandri (leaf) greatly reduced aphid settling by 61 % and 67 %, respectively, compared with controls. Five extracts from New Zealand and 12 from Chilean Nothofagus species significantly…
author: Vasanthaverni, S.
language: en
keywords: New Zealand Nothofagus, Chilean Nothofagus, antifeedant, deterrent, light brown apple moth, tropical armyworm, pea aphid, plant extracts, bioassay, choice, no-choice, feeding index, artificial diet, Nothofagus, ANZSRC::0607 Plant Biology, ANZSRC::050103 Invasive Species Ecology
license: https://researcharchive.lincoln.ac.nz/pages/rights
date published: 1997
date modified: 2026-07-24T02:50:30Z
provider: Lincoln University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Lincoln University

PropertyValue
property ID: Handle
value: https://hdl.handle.net/10182/2793