Parasitism of diamondback moth Plutella xylostella by the solitary parasitoid wasp Cotesia vestalis in Samoa

Q3 Agricultural and Biological Sciences

New Zealand Plant Protection Pub Date : 2019-07-28 DOI:10.30843/NZPP.2019.72.324

Hau’ofa Siasau, R. Kant

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引用次数: 1

Abstract

Plutella xylostella is a major pest of crucifier crops in Samoa and other Pacific islands. This pest has developed resistance to most insecticides available in the island nations so the objective of this study was to examine potential biological control options for P. xylostella in Samoa. Existing parasitism of P. xylostella on Chinese cabbage (Brassica rapa subspp.) was investigated at a farm in Alesia and at the USP farm in Alafua, and established populations of Cotesia vestalis were found at both locations. Plutella xylostella larvae turn light yellow and show sluggish behaviour after parasitism, and they could be easily differentiated from unparasitised ones. Developing C. vestalis larvae emerge from their hosts and spin white cocoon around their body. After 5–6 days, a single adult emerges from the C. vestalis cocoon. The average parasitism rate between April 2015 and March 2016 was 10–18% but was significantly higher at the USP farm than the Alesia farm. This result could be because no insecticides were applied to the crops at USP. Parasitism was highest between June and August when the lowest average daily temperatures occur.

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萨摩亚地区小菜蛾被独居寄生蜂蜂寄生的研究

小菜蛾是萨摩亚和其他太平洋岛屿十字花科作物的主要害虫。这种害虫已对岛屿国家现有的大多数杀虫剂产生抗药性，因此本研究的目的是研究萨摩亚小菜蛾的潜在生物防治选择。在阿莱西亚(Alesia)的一个农场和Alafua的USP农场调查了小菜蛾寄生在白菜(芸苔亚种)上的情况，在这两个地点都发现了已建立的小菜蛾种群。小菜蛾幼虫被寄生后呈淡黄色，行为迟缓，易与未被寄生幼虫区分。发育中的维斯塔蜂幼虫从寄主中出来，在寄主的身体周围结起白色的茧。5-6天后，一个单独的成虫从C. vestalis茧中出来。2015年4月至2016年3月的平均寄生率为10-18%，但USP农场的寄生率明显高于阿莱西亚农场。这一结果可能是因为USP没有对作物施用杀虫剂。6 ~ 8月是日平均气温最低的时期，寄生率最高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

New Zealand Plant Protection Agricultural and Biological Sciences-Insect Science

CiteScore

1.10

自引率

0.00%

发文量

期刊介绍： New Zealand Plant Protection is the journal of the New Zealand Plant Protection Society. It publishes original research papers on all aspects of biology, ecology and control of weeds, vertebrate and invertebrate pests, and pathogens and beneficial micro-organisms in agriculture, horticulture, forestry and natural ecosystems of relevance to New Zealand.