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Growth rate differences of wild vs laboratory reared sugarcane adapted strains oftrichogramma chilonis ishii (hymenoptera: trichogrammatidae)

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Abstract

Sugarcane adapted wild strains of egg parasitoid,Trichogramma chilonis Ishii was collected from sugarcane agro ecosystem of Paedegaon (Maharashtra) and Lucknow (U.P). Growth rate of wild strain ofT. chilonis Ishii was compared with laboratory strains of Lucknow and Paedegaon under laboratory condition at 28 ± 2 o C and 60 ± 5 percent relative humidity. The mean longevity (4.8 and 4.4 days) of wildT.chilonis strain was more than laboratory strains (3.5 & 2.6 day) of Lko &Pgn, respectively. Female progeny production was observed to be intensive for the first day (except Lko) after which it reduced drastically of wild as well as laboratory strain. The net reproduction rate (Ro) showed that a female parasitoid produced 50.15 and 47.88 females’ offspring during its life span of wild strain ofT.chilonis than laboratory strain (32.36 and 39.81) of Pgn&Lko strains, respectively. The intrinsic rate of natural increase (rm) for wild strain of T.chilonis (Pgn & Lko) were 0.3701; 0.3598 than laboratory reared strain (0.3389; 0.3535), respectively. The finite rate of increase of wild strain (1.448 and 1.433) was more than laboratory strain (1.40 &1.420) of Pgn&Lko, respectively. It can be concluded that identifiedTrichogramma chilonis strain with favourable sex ratios and scope for further enhancement of ratio of female through manipulation in the rearing conditions and the laboratory strain need to be augmented fortnightly with wild strain.

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Correspondence to Arun Baitha.

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Baitha, A. Growth rate differences of wild vs laboratory reared sugarcane adapted strains oftrichogramma chilonis ishii (hymenoptera: trichogrammatidae). Sugar Tech 7, 53–56 (2005). https://doi.org/10.1007/BF02942530

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