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首页> 外文期刊>African Entomology >Bollworm (Helicoverpa armigera (Hubner), Lepidoptera : Noctuidae) occurrences in Bt- and non-Bt-cotton fields, Marble Hall, Mpumalanga, South Africa
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Bollworm (Helicoverpa armigera (Hubner), Lepidoptera : Noctuidae) occurrences in Bt- and non-Bt-cotton fields, Marble Hall, Mpumalanga, South Africa

机译：棉铃虫（Helicoverpa armigera（Hubner），鳞翅目：夜蛾科）在南非姆普马兰加省大理石厅的Bt和非Bt棉田发生

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摘要

Helicoverpa armigera is one of the major pests of cotton crops. Bt-cotton, (transgenic cotton) that contains cry genes from Bacillus thuringiensis, was introduced as a control measure against Heliothis virescens in the U.S.A. Cry genes encode for toxins that are toxic to lepidoteran pests. The effect of Bt-cotton (cv. NuOpal) on H. armigera population numbers and egg parasitism was investigated. Scouting was conducted once a week over two cotton-growing seasons at a cotton farm near Marble Hall. The number of damaged bolls, bollworm eggs and larvae were determined in non-Bt- (cv. Delta Opal) and Bt-cotton fields. No pesticides were used during the first season. A sprayed non-Bt cotton field was included in the second season's study. Pheromone traps baited with the sex pheromone of H. armigera were checked on a weekly basis to determine the number of adults in the fields under investigation. Bollworm eggs were collected during the second season to determine egg parasitism. The number of bollworm larvae and damaged cotton bolls were kept below threshold levels by the presence of the Bt-gene in the Bt-cotton fields and by insecticide applications in the non-Bt-cotton fields. Moth numbers, H. armigera oviposition and parasitoid emergence from bollworm eggs by Trichogrammatoidea lutea and Telenomus ullyetti were not influenced by the presence of the Bt-gene. Bt-cotton can therefore be useful in an integrated pest management programme under an irrigation system, because it resulted in a reduction in the number of insecticide applications per season and did not affect the biological control agents T lutea and T ullyetti.
机译：棉铃虫是棉农作物的主要害虫之一。含有苏云金芽孢杆菌的Cry基因的Bt棉（转基因棉花）在美国被引入作为控制措施，以对抗棉铃虫（Heliothis virescens）.Cry基因编码对鳞翅目害虫有毒的毒素。研究了Bt棉（Cv。NuOpal）对棉铃虫种群数量和卵寄生性的影响。在两个棉花种植​​季节，每周在Marble Hall附近的棉花农场进行一次侦察。在非Bt-（cv。Delta Opal）和Bt-cotton田中测定了受损的铃虫，棉铃虫卵和幼虫的数量。在第一个季节不使用任何农药。第二季的研究包括喷洒非Bt棉田。每周检查一次用棉铃虫性信息素诱饵的信息素陷阱，以确定所调查田地中成虫的数量。在第二季收集棉铃虫卵，以确定卵是否寄生。通过在Bt棉田中存在Bt基因，并在非Bt棉田中使用杀虫剂，将棉铃虫幼虫和受损棉铃的数量保持在阈值以下。 Bt基因的存在不影响棉铃虫卵的蛾数，棉铃虫产卵和寄生虫卵的生长。因此，Bt棉可在灌溉系统下的综合害虫管理计划中有用，因为它导致每个季节施用杀虫剂的次数减少，并且不影响生物防治剂T lutea和T ullyetti。

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