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<p>The olive worm <i>Palpita forficifera</i> Munroe, 1959 is the main pest of olive growing in Brazil. The aim of this study was to study the development of <i>P.&#xa0;forficifera</i> under different conditions of relative humidity (RH) and photoperiod. The development stages were subjected to RH ranges of 0–20, 21–40, 41–60, 61–80 and 81–100% and photoperiods (light/dark) of 4/20, 8/16, 12/12, 16/8 and 20/4 h. Biological parameters were determined and a&#xa0;fertility life table was drawn up. RH above 81% provides the best development of the egg-pupae period of <i>P.&#xa0;forficifera</i>. While below 20% there is no development. For the adult stage, it was observed that RH has less impact than for the immature stages. However, when the biological parameters of the immature and adult stages are analyzed together using the fertility life table, it can be concluded that relative humidities above 61% promote better development of the species. Immature stages of <i>P.&#xa0;forficifera</i> reared in photoperiods with more hours of darkness (4/20 h and 8/16 h—light/dark, respectively) show better development. This is different to the adult stage, where all photoperiods are suitable for the reproduction of the species. However, according to the fertility life table, it is clear that photoperiods with 20 h of darkness are the most suitable. The results of this study are important for predicting the occurrence of the insect in the field and helping to design management strategies.</p>

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The Effect of Relative Humidity and Photoperiod On the Development of Palpita forficifera (Lepidoptera: Crambidae)

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Tiago Scheunemann,
  • Luiz Miguel Corrêa,
  • Alexandra Peter Krüger,
  • Guido Aguilera,
  • Daniel Bernardi,
  • Dori Edson Nava

摘要

The olive worm Palpita forficifera Munroe, 1959 is the main pest of olive growing in Brazil. The aim of this study was to study the development of P. forficifera under different conditions of relative humidity (RH) and photoperiod. The development stages were subjected to RH ranges of 0–20, 21–40, 41–60, 61–80 and 81–100% and photoperiods (light/dark) of 4/20, 8/16, 12/12, 16/8 and 20/4 h. Biological parameters were determined and a fertility life table was drawn up. RH above 81% provides the best development of the egg-pupae period of P. forficifera. While below 20% there is no development. For the adult stage, it was observed that RH has less impact than for the immature stages. However, when the biological parameters of the immature and adult stages are analyzed together using the fertility life table, it can be concluded that relative humidities above 61% promote better development of the species. Immature stages of P. forficifera reared in photoperiods with more hours of darkness (4/20 h and 8/16 h—light/dark, respectively) show better development. This is different to the adult stage, where all photoperiods are suitable for the reproduction of the species. However, according to the fertility life table, it is clear that photoperiods with 20 h of darkness are the most suitable. The results of this study are important for predicting the occurrence of the insect in the field and helping to design management strategies.