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• Some Reseach Result on Larval Ectoparsitoid Stenomesius sp. (Hym.: Eulophidae) on Green Bean Leaffolder Omiodes indicata (F.) (Lep.: Pyralidae) in Spring 2010 at Nghi Loc, Nghe An

  Nhung Vo Thi Hong, Dung Dang Thi, Long Khuat Dang

  Date Received: 29-10-2011 / Date Accepted: 14-02-2012 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  Stenomesius sp. (Eulophidae) is the most frequently occurring parasitoid species on green bean leaffolder Omiodes indicata F. Life cycle of Stenomesius sp.  was about 11.11 ± 0.26 days at temperature of 25.4 ± 1.7°C  and 89.0 ± 3.5% relative humidity, in which the development of egg, larva, pupa and adult were 1.1, 4.39, 4.76 and 0.86 days, respectively. Food supplement showed a clear effect on adult longevity as well as oviposition. Adult’s longevity of wasp at each treatment (pure honey, 50%, 10% honey solution and water) was 12.75, 7.75, 3.13 and 2.38 days. Oviposition capacity at each treatment was 85.5, 39.3, 15.5 and 12.5 eggs per female on host individuals of 9.75, 5.25, 2.25 and 2.0 individual/female respectively. The percentage of adult emergence of Stenomesius sp. was very high in laboratory conditions (87.8 – 94.1%) as well as those pupae collected from green bean field (88.5 – 92.8%) in 2010 spring season. The sexual ratio of Stenomesius sp. was more on the side of female, 1male: 3.8-4.95 females from those pupae obtained in laboratory and 1male: 3.3-4.4 females of those pupae obtained from field.

  DOI: https://doi.org/10.31817/tckhnnvn.2012.10.1.

• Sesami Insect Pest Composition and Density Variation of Leaffolder Antigastra catalaunalis (Dup.) (Lep.: Pyralidae) in 2010, 2011 at Loc Ha, Ha Tinh

  Khanh Nguyen Duc, Dung Dang Thi

  Date Received: 29-10-2011 / Date Accepted: 05-02-2012 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  Sesame (Sesamum indicum L.) is an industrial crop for oil production with high nutritive and economical values. But, like other plants, sesame is attacked by many insect pests. There are not many articles on insect pest diversity in general and leaffolder in particularly elsewhere. The survey results in 2010 and 2011 showed that there are 16 insect pests on sesame during 2010 and 15 species appeared during 2011. Sesame leaffolder (Antigastra catalaunalis Dup.) is one among the important species affecting yield significantly. The density variation of leaffolder/webber during 2010 spring season was less than in summer season (5.6 ind./m2 and 28.6 ind./m2 at Thach Bang village). The population dynamics of sesame leaffolder during summer season of 2010 at three villages (Thach My, Thach Chau and Thach Bang) was similar and rather high. The sesame leaffolder appeared and damaged on sesame plant from early stage till pod maturity. In 2011, A. catalaunalis appeared later and thedensity was lower than that in 2010. The highest density was 5.4 ind./m2 and 1.8 ind./m2 in spring-summer and summer-autumn season, respectively, at Thach Bang village. The density of sesame leaffolder in summer-autumn 2011 at Thach Chau was higher than at Thach My and Thach Bang village.

  DOI: https://doi.org/10.31817/tckhnnvn.2012.10.1.