Insect pest management by intercropping with leafy daikon (Raphanus sativus) in cabbage fields

Takayuki Sekine, Kenji Kanao, Shota Inawashiro, Masatoshi Hori

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7 Citations (Scopus)


Insect pest occurrences on cabbage fields intercropped with leafy daikon, which is known to present a decoy plant for clubroot disease and belongs to the same family as cabbage (Brassicaceae), were examined at open field in the Miyagi prefecture, northern Japan. Four experiments were conducted to examine the influence of: intercropped leafy daikon’s seeding density on insect pest occurrence, trimming of intercropped leafy daikon on both insect pest occurrence and cabbage yield, and mix-cropping of leafy daikon and cabbage on insect pest occurrence. Leafy daikon intercropping reduced the occurrence of some insect pest species, especially that of the pests categorized as leaf-chewing pests, such as beet semi-loopers, Autographa nigrisigna Walker (Lepidoptera: Noctuidae), and small white butterflies, Pieris rapae crucivora Boisduval (Lepidoptera: Pieridae), and the results were compared with their occurrences in barley intercropping and non-intercropping. These two insect species were rarely observed on intercropped and mix-cropped leafy daikon, indicating it did not work as a trap crop. However, a reduction in cabbage yield due to shading of leafy daikon intercropping was observed, but the yield loss was mitigated by trimming of intercropped leafy daikon during the cultivation. Furthermore, leafy daikon intercropping with trimming had the same occurrence reduction effects against A. nigrisigna and P. rapae crucivora as leafy daikon intercropping without trimming. Our findings suggested that intercropping of closely related plants was possible by selecting the appropriate combinations of parameters and proper strategies, which proved to be useful for insect pest management in mix-cropping systems.

Original languageEnglish
Pages (from-to)669-681
Number of pages13
JournalArthropod-Plant Interactions
Issue number5
Publication statusPublished - 2021 Oct


  • Autographa nigrisigna
  • Insect–plant interactions
  • Integrated pest management
  • Mix-cropping
  • Pieris rapae crucivora


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