INFLUENCE OF REARING TEMPERATURE AND COLD STORAGE ON Trichogramma chilonis (Ishii).
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Date
2018-07-17
Authors
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Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.
Abstract
The present investigation entitled “Influence of rearing temperature and cold storage on Trichogramma chilonis (Ishii)” during the year 2017-18 at Biocontrol laboratory, Department of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth Akola. Freshly laid, U.V irradiated 50 eggs of Corcyra cephalonica were pasted on a small yellow paper card (Trichocard) strip (4 x 3.5 cm) and such trichocard strips were kept in separate polythene bag at different temperature regimes (25, 30, 35, and 40oC) and humidity 40 ± 10% under BOD incubator and observations were recorded on different biological parameters of T. chilonis. Similarly, the parasitized trichocards were stored at 4, 8 and 12oC temperatures to study the effect on storage durability.
The results revealed that maximum per cent parasitisation and adult emergence of 74.2% and 78.91%, respectively was observed at 25+1oC followed by 71.8% and 65.21 % at 30±1oC. However, the temperature of 40+1oC was found detrimental to T. chilonis recording 20.2 % parasitization which failed completely to emergeout. The developmental period was maximum (8 days) at 25+1oC. Maximum male and female longevity (5 and 12 Days) respectively were also observed at 25+1oC. Mean per day fecundity was observed maximum of 17 eggs per female/ day at 25+1oC. The progeny was found to be male dominated with a female- male ratio of T. chilonis to be 0.69, 0.74 and 0.96 at 25, 30 and 35oC, respectively.
Cold storage of Trichocard stripes at 4oC, 8oC and 12oC respectively for 15, 25, 35 days revealed that after 15 days storage of trichocards at 12oC, maximum adult emergence (90.52%) and parasitisation (76.81%) were recorded. Whereas, after 25 days storage, maximum parasitisation (57.94%) was obtained at 4oC and emergence (81.75%) was observed at 8oC storage. For 35 days storage, parasitisation of 25.49% was recorded at 4oC and 21.66 % adult emergence was observed at 8oC.
Storage of Trichocards at 4oC for 15 days and then shifting to 8oC for 10 days was found superior in storing of Trichocards and recorded maximum adult emergence (71.25%) and maximum parasitisation (68.18%) as compared to shifting to 12oC for 10 days. Storage of Trichocards at 4oC for 15 days and then shifting to 12oC for 20 days has recorded highest (44.22%) parasitisation and (35.89%) adult emergence.
Description
The present study a serious attempt has made to study the Influence of rearing temperature and cold storage on Trichogramma chilonis (Ishii). Temperature and cold storage period are the major factors that adversely affect the performance of T. chilonis and recording reduction in percent parasitisation, adult emergence, fecundity, longevity, developmental period, sex ratio of T. chilonis. Since the parasitoid in the laboratory is reared at optimum temperatures, its survival under field conditions will depend on its ability to resist inhospitable field conditions, particularly the high temperature.
Keywords
Plant Protection, Control Methods, Biological control agents, Trichogramma chilonis, Temperature, Cold Storage, Experimentation, Research, Laboratory Experimentation, Trichogramma chilonis parasitisation, Trichogramma chilonis fecundity, Trichogramma chilonis longevity, Adult emergence, Corcyra cephalonica.
Citation
WAGHMARE, AMOL PANJABRAO. (2018). Influence of rearing temperature and cold storage on Trichogramma chilonis (Ishii). Department of Agricultural Entomology. Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Sc. 2018. Print. xii, 72p. (Unpublished).