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<p>The fall armyworm, <i>Spodoptera frugiperda</i> (J.E. Smith) is a destructive pest that affects more than 80 different crops. Originally found in North and South America, it was first discovered in Ethiopia in 2017. To control this pest, farmers often rely on heavy pesticide use. However, this approach can lead to unintended consequences such as the development of resistance in the pest, the emergence of secondary pests, and a decline in natural enemy populations. To address these challenges, there is a growing interest in developing agroecological pest management solutions, such as crop diversity. One approach is the use of intercropping systems, where different crops are grown together. The study included four treatments: maize-cowpea, maize-haricot bean, maize-mung bean and maize monocrop. The highest number of fall armyworm male adults was trapped during the rainy season compared to the dry period. Infestation levels reached as high as 89.5% in sole maize plots but were reduced to 67% in intercropped plots. Similarly, the average damage scale, which rose to 7% in sole maize systems, decreased to 5% in maize-bean intercropping systems. The study also observed a greater abundance of natural enemies in intercropped plots, including predators such as ladybirds (16.04%), lacewings (17.46%), ants (29.44%) and earwig (11.83%). Among parasitoids, <i>Cotesia congregate</i> (Say) (15.54%) and <i>Palexorista zonata</i> (Curran) (12.67%) were the most prevalent in the intercropped systems. By creating a more diverse and balanced ecosystem, farmers can enhance natural pest control and reduce their reliance on pesticides. Based on these findings, intercropping systems are of paramount importance in managing fall armyworms in maize-producing areas of Ethiopia.</p>

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Impact of maize-legume intercropping systems on fall armyworm, Spodoptera frugiperda (J.E. Smith) infestation levels and natural enemy complex

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Ahmed Ibrahim Yuya,
  • Emana Getu Degaga,
  • Dawit Tesfaye Degefu,
  • Girma Demisse Bekele

摘要

The fall armyworm, Spodoptera frugiperda (J.E. Smith) is a destructive pest that affects more than 80 different crops. Originally found in North and South America, it was first discovered in Ethiopia in 2017. To control this pest, farmers often rely on heavy pesticide use. However, this approach can lead to unintended consequences such as the development of resistance in the pest, the emergence of secondary pests, and a decline in natural enemy populations. To address these challenges, there is a growing interest in developing agroecological pest management solutions, such as crop diversity. One approach is the use of intercropping systems, where different crops are grown together. The study included four treatments: maize-cowpea, maize-haricot bean, maize-mung bean and maize monocrop. The highest number of fall armyworm male adults was trapped during the rainy season compared to the dry period. Infestation levels reached as high as 89.5% in sole maize plots but were reduced to 67% in intercropped plots. Similarly, the average damage scale, which rose to 7% in sole maize systems, decreased to 5% in maize-bean intercropping systems. The study also observed a greater abundance of natural enemies in intercropped plots, including predators such as ladybirds (16.04%), lacewings (17.46%), ants (29.44%) and earwig (11.83%). Among parasitoids, Cotesia congregate (Say) (15.54%) and Palexorista zonata (Curran) (12.67%) were the most prevalent in the intercropped systems. By creating a more diverse and balanced ecosystem, farmers can enhance natural pest control and reduce their reliance on pesticides. Based on these findings, intercropping systems are of paramount importance in managing fall armyworms in maize-producing areas of Ethiopia.