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<p><i>Leptocybe invasa</i> Fisher &amp; La Salle is an invasive pest, native to Australia, causing heavy damage in <i>Eucalyptus</i> nurseries and plantations throughout the world. The present study was conducted during 2020–2021 to observe the variation in the time taken for completion of the life cycle of <i>L. invasa</i> with respect to the season. To study the biology throughout the year, the leaves were tagged four times on 15 March, 15 June, 15 September and 15 December. Adult emergence was observed from two types of galls viz., pink and green coloured galls during summer months and only from pink coloured galls during winter months. When adults emerged from pink coloured galls, the life cycle was completed in 115–150 days consisting of five stages of gall development viz. Stage 1 (Tissue disruption), Stage 2 (Gall development), Stage 3 (Glossy pink), Stage 4 (Dull pink) and Stage 5 (Exit hole). During summer months, life cycle of <i>L. invasa</i> was completed in 115–119 days when adults emerged from pink coloured galls. However, life cycle of <i>L. invasa</i> was extended in winter season due to hibernation in larval and pupal stage and life cycle was completed in 150 days. Additionally, adult emergence was also observed from green galls during summer months and life cycle of <i>L. invasa</i> was completed in 86–89 days. Further, when adults emerged from green coloured galls in summer months, stage 3 and stage 4 were not observed. Adult longevity was significantly higher when adults were fed on honey water solution (6.16 days) followed by only water (4.56 days). So, in current study we recorded total life cycle of <i>L. invasa</i> was completed in 86–150 days depending upon the season. Wasps that were in larval and pupal stage in the early winter started to emerge in spring. Therefore, effective management of emerging adults during February-March can reduce the infestation of <i>Eucalyptus</i> plantations in the coming months by reducing the population of the adults that will continue to lay eggs on the uninfested plants.</p>

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Comparative biology of Leptocybe invasa (Hymenoptera: Eulophidae) in green and pink galls on Eucalyptus in north western India

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Saloni Nag,
  • Kamaldeep Singh Sangha,
  • Gurvinder Pal Singh Dhillon

摘要

Leptocybe invasa Fisher & La Salle is an invasive pest, native to Australia, causing heavy damage in Eucalyptus nurseries and plantations throughout the world. The present study was conducted during 2020–2021 to observe the variation in the time taken for completion of the life cycle of L. invasa with respect to the season. To study the biology throughout the year, the leaves were tagged four times on 15 March, 15 June, 15 September and 15 December. Adult emergence was observed from two types of galls viz., pink and green coloured galls during summer months and only from pink coloured galls during winter months. When adults emerged from pink coloured galls, the life cycle was completed in 115–150 days consisting of five stages of gall development viz. Stage 1 (Tissue disruption), Stage 2 (Gall development), Stage 3 (Glossy pink), Stage 4 (Dull pink) and Stage 5 (Exit hole). During summer months, life cycle of L. invasa was completed in 115–119 days when adults emerged from pink coloured galls. However, life cycle of L. invasa was extended in winter season due to hibernation in larval and pupal stage and life cycle was completed in 150 days. Additionally, adult emergence was also observed from green galls during summer months and life cycle of L. invasa was completed in 86–89 days. Further, when adults emerged from green coloured galls in summer months, stage 3 and stage 4 were not observed. Adult longevity was significantly higher when adults were fed on honey water solution (6.16 days) followed by only water (4.56 days). So, in current study we recorded total life cycle of L. invasa was completed in 86–150 days depending upon the season. Wasps that were in larval and pupal stage in the early winter started to emerge in spring. Therefore, effective management of emerging adults during February-March can reduce the infestation of Eucalyptus plantations in the coming months by reducing the population of the adults that will continue to lay eggs on the uninfested plants.