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<p>The cropping systems commonly used in Brazil provide an abundance of hosts for <i>Rhopalosiphum maidis</i>. This aphid is an abundant pest in corn and its polyphagous habit allows it to infest many species of Poaceae. This study aimed to examine the effect of cropping systems on the population abundance and dynamics of <i>R. maidis</i>. The cropping systems evaluated were Fallow, Hybrid corn SYN 7205 TG, SYN 7205 TLTG Viptera, event MIR162 + Bt11, <i>Urochloa ruziziensis</i> grown as monocultures, while intercropping systems included SYN 7205 TG + <i>U. ruziziensis</i> and SYN 7205 TLTG Viptera + <i>U. ruziziensis</i>. Treatments consisted of five repetitions arranged in randomized blocks. The trial was carried out with two harvests in summer and one in fall. The <i>R. maidis</i> population in the three seasons was best described by the negative binomial generalized linear model, and the means were compared by overlapping the confidence intervals predicted by the adjusted model. When differences occurred, monoculture corn positively affected the abundance of <i>R. maidis</i>, while its reproductive performance in <i>U. ruziziensis</i> and fallow was lower. Thus, the intercropping with <i>U. ruziziensis</i> contributed to aphid management by reducing its population <i>R. maidis.</i></p>

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How intercropping systems with corn (Zea mays) and Urochloa ruziziensi can affect the abundance of Rhopalosiphum maidis

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  • 发表日期：

    2026年6月18日

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  • Evandro Gauer,
  • Paulo Eduardo Degrande,
  • Filipe Jacques Lemos,
  • José Bruno Malaquias

摘要

The cropping systems commonly used in Brazil provide an abundance of hosts for Rhopalosiphum maidis. This aphid is an abundant pest in corn and its polyphagous habit allows it to infest many species of Poaceae. This study aimed to examine the effect of cropping systems on the population abundance and dynamics of R. maidis. The cropping systems evaluated were Fallow, Hybrid corn SYN 7205 TG, SYN 7205 TLTG Viptera, event MIR162 + Bt11, Urochloa ruziziensis grown as monocultures, while intercropping systems included SYN 7205 TG + U. ruziziensis and SYN 7205 TLTG Viptera + U. ruziziensis. Treatments consisted of five repetitions arranged in randomized blocks. The trial was carried out with two harvests in summer and one in fall. The R. maidis population in the three seasons was best described by the negative binomial generalized linear model, and the means were compared by overlapping the confidence intervals predicted by the adjusted model. When differences occurred, monoculture corn positively affected the abundance of R. maidis, while its reproductive performance in U. ruziziensis and fallow was lower. Thus, the intercropping with U. ruziziensis contributed to aphid management by reducing its population R. maidis.