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Presence of corn earworm and fall armyworm (Lepidoptera: Noctuidae) populations in sweet corn and their susceptibility to insecticides in Puerto Rico

机译:波多黎各甜玉米中玉米穗虫和秋天粘虫(鳞翅目:夜蛾科)种群的存在及其对杀虫剂的敏感性

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Corn earworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae), and fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), are important pests in sweet corn. Our objectives were to assess the occurrence of the Lepidopteran species affecting sweet corn in Puerto Rico, and to evaluate the efficacy of 9 insecticides to control larvae of corn earworm and fall armyworm. Spodoptera frugiperda was observed in all plant stages, whereas H. zea and Diatraea saccharalis (F.) (Lepidoptera: Crambidae) affected only ears. Larvae of corn earworm and fall armyworm were susceptible (mortality > 80% at 96 h) to Steinernema carpocapsae (Weiser) (Nematoda: Steinernematidae) + oil and to methomyl, respectively, whereas both species were susceptible to chlorpyrifos. The LC50 values for chlorpyrifos was 248 ppm, whereas 312,500 S. carpocapsae nematodes per L + 625 ppm of rapeseed oil caused 53% of larval mortality at 120 h post-treatment for corn earworm larvae.
机译:玉米ear,Helicoverpa zea(Boddie)(鳞翅目:夜蛾科)和秋夜蛾,Spodoptera frugiperda(J。E. Smith)(鳞翅目:夜蛾科)是甜玉米中的重要害虫。我们的目标是评估影响鳞翅目甜玉米的鳞翅目物种在波多黎各的发生,并评估9种杀虫剂控制玉米穗虫和秋天粘虫幼虫的功效。在植物的所有阶段都观察到了节食夜蛾,而玉米和夜蛾(F。)(鳞翅目:Dia科)仅影响耳朵。玉米穗虫和秋天粘虫的幼虫分别对Steinernema carpocapsae(Weiser)(Nematoda:Steinernematidae)+油和灭多威易感(死亡率在96 h时≥80%),而这两个物种均对毒死rif易感。毒死rif的LC50值为248 ppm,而每升+ 625 ppm菜籽油中的312,500碳荚膜链球菌线虫导致玉米穗虫幼虫在处理后120 h造成53%的幼虫死亡率。

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