Effect of gamma irradiation and holding solutions on vase life of Dendrobium cut flowers

Authors

  • R Madhubala Plant Biosecurity Division, National Institute of Plant Health Management, Rajendranagar, Hyderabad 500 030, Telangana, India
  • Alice R P Sujeetha Plant Biosecurity Division, National Institute of Plant Health Management, Rajendranagar, Hyderabad 500 030, Telangana, India
  • M Rajasri Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad 500 030, Telangana, India
  • M Sreedhar Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad 500 030, Telangana, India
  • P Mahesh Plant Biosecurity Division, National Institute of Plant Health Management, Rajendranagar, Hyderabad 500 030, Telangana, India
  • c s Gupta Plant Biosecurity Division, National Institute of Plant Health Management, Rajendranagar, Hyderabad 500 030, Telangana, India

Keywords:

Irradiation, phytosanitary treatment, vase life, Dendrobium, cut flower, orchid, blossom midge

Abstract

Dendrobium Orchid is cultivated on large scale for cut flower production in southern states. During the survey, it was observed that blossom midge (Contarinia maculipennis) and leaf spot caused by Alternaria sp were identified as problems on Dendrobium. An experiment was conducted to study the effect of irradiation on the vase life and to get rid of pest problems of Dendrobium var. Sonia . The radiation doses of 150, 250, 350 and 450 Gy were evaluated at room temperature as experimental set I (27º±1ºC) and at refrigerated condition as experimental set II (4º C) on parameters such as per cent flower damage and freshness score at different day intervals. The cut flowers were tolerant to irradiation dose of 450 Gy based on per cent flower damage, freshness score and water uptake. There was no flower damage up to 7 days at room temperature. Interestingly, at refrigerated condition, the freshness score was 5 for all the treatments and control and there was no flower damage up to 20 days in all irradiated cut flowers as well in control. In an another experiment to determine the effect of chemical holding / preservative solution on the vase life of Dendrobium var. Sonia, of the eight different solutions, it was found that minimum per cent flower damage (36.9%) and maximum freshness score (3.3) was observed in 8-Hydroxy quinoline sulphate (150 ppm) on fifteenth day. Based on findings of the present study, it can be concluded that Dendrobium cut flowers were toletant to 450 Gy dose irradiation and this dose is effective against most insects. Irradiation can be used as a phytosanitary measure to control most of the quarantine significance pests associated with Dendrobium. Moreover, it is found that 8-Hydroxy quinoline sulphate (150 ppm) has a great potential to prolong the vase life of Dendrobium var. Sonia cut flower.

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Published

2022-02-26

How to Cite

Madhubala, R., Sujeetha, A. R. P., Rajasri, M., Sreedhar, M., Mahesh, P., & Gupta, c s. (2022). Effect of gamma irradiation and holding solutions on vase life of Dendrobium cut flowers. Indian Journal of Plant Protection, 49(4). Retrieved from https://epubs.icar.org.in/index.php/IJPP/article/view/121807

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