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<p>Sap beetle (<i>Epuraea</i> sp.) is a&#xa0;newly recorded non-native invasive pest of bottle gourd <i>Lagenaria siceraria</i> (Molina) Standley in Bangladesh. The beetles significantly reduce bottle gourd production by hindering pollination. As the beetles were newly recorded, understanding their life cycle and phenology is a&#xa0;prerequisite to developing suitable management strategies. Therefore, we performed a&#xa0;laboratory-based study to determine sap beetle’s life cycle and a&#xa0;field-based study to record the phenological data. Results revealed that sap beetles lay whitish, elongated eggs with tapering ends inside the stamens of male flowers. The eggs were 0.76 ± 0.031 mm in length and hatched within 2.9 ± 0.23 days. Larvae fed on the decomposed matter of male bottle gourd flowers. Neonate larvae and mature larvae were 0.85 ± 0.031 and 2.66 ± 0.058 mm in length, respectively. The larval period was 11.72 ± 0.28 days. Matured larvae entered into soil to pupate. The pupal period was 7.73 ± 0.33 days. The reddish-brown adults were 2.26 ± 0.054 mm long and survived for 24.70 ± 0.95 days. Pearson’s correlation analysis disclosed a&#xa0;negative correlation of sap beetle population with relative humidity and rainfall, while temperature showed no significant correlation. Additionally, the number of both male and female flowers positively correlated with the number of sap beetles per plant. During the field experiment, 98% of the fruits were unset or dropped prematurely due to this beetle infestation. This study will help the growers with sustainable management of sap beetles in Bangladesh.</p>

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Life Cycle and Phenology of Invasive Sap Beetle (Epuraea sp.) Infesting Bottle Gourd in Bangladesh

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Khadiza Sultana Snigda,
  • M. Bishal Rahman,
  • Jakia Jannat,
  • Kamrul Hassan,
  • Feroze Abdullah,
  • Fabiha Amin Chowdhury,
  • Md. Fuad Mondal

摘要

Sap beetle (Epuraea sp.) is a newly recorded non-native invasive pest of bottle gourd Lagenaria siceraria (Molina) Standley in Bangladesh. The beetles significantly reduce bottle gourd production by hindering pollination. As the beetles were newly recorded, understanding their life cycle and phenology is a prerequisite to developing suitable management strategies. Therefore, we performed a laboratory-based study to determine sap beetle’s life cycle and a field-based study to record the phenological data. Results revealed that sap beetles lay whitish, elongated eggs with tapering ends inside the stamens of male flowers. The eggs were 0.76 ± 0.031 mm in length and hatched within 2.9 ± 0.23 days. Larvae fed on the decomposed matter of male bottle gourd flowers. Neonate larvae and mature larvae were 0.85 ± 0.031 and 2.66 ± 0.058 mm in length, respectively. The larval period was 11.72 ± 0.28 days. Matured larvae entered into soil to pupate. The pupal period was 7.73 ± 0.33 days. The reddish-brown adults were 2.26 ± 0.054 mm long and survived for 24.70 ± 0.95 days. Pearson’s correlation analysis disclosed a negative correlation of sap beetle population with relative humidity and rainfall, while temperature showed no significant correlation. Additionally, the number of both male and female flowers positively correlated with the number of sap beetles per plant. During the field experiment, 98% of the fruits were unset or dropped prematurely due to this beetle infestation. This study will help the growers with sustainable management of sap beetles in Bangladesh.