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Phytoparasitica

, Volume 46, Issue 3, pp 273–281 | Cite as

Differential response to combined prochloraz and thyme oil drench treatment in avocados against the control of anthracnose and stem-end rot

  • Chinelo Obianom
  • Dharini Sivakumar
Article
  • 146 Downloads

Abstract

The ability to meet consumers demand for high-quality standard fruit entails the distribution of unblemished safe fruit free of chemical residues on its edible portion. Therefore, this study was focused on investigating the influence of the combined effect of aqueous plant volatiles with half strength prochloraz solution to control anthracnose and stem-end rot in the green-skinned avocado cultivar (Fuerte). This method was applied due to its practicability on bulk fruits in packhouses and the fruits were subjected to stand-alone and combined treatments to assess the development of the disease after cold storage and observe the elicitation of the residual effect of the treatments on the defence related enzymes in ‘Fuerte’. The incidence of stem-end rot was 10% by the combination of prochloraz® (500 μg mL−1; P50) with 0.1% v/v thyme oil compared to the 58.8% incidence exhibited by the untreated fruit during storage at 6.5 °C for 14 days followed by 3 days at retail shelf conditions (15 °C) (preventative application). Citral (0.1% v/v), P50 (500 μg mL−1) + 0.1% v/v citral and yucca extract alone reduced the stem-end rot incidence to about 25% during storage. More so, thyme oil (0.1% v/v) reduced both anthracnose and stem-end rot incidence to 35% after postharvest storage and P50 (500 μg mL−1) + 0.1% v/v thyme oil and 0.1% v/v thyme oil effectively induced the activity of phenylalanine ammonia lyase, chitinase and β-1, 3 glucanase in fruit inoculated with Lasiodiplodia theobromae and Colletotrichum gloeosporioides through the improvement of quality and firmness of the fruit after storage.

Keywords

Fungicide Citral Essential oils Defence Postharvest diseases 

Notes

Acknowledgements

Authors sincerely thank the financial support grant number [13] from South African Avocado Growers Association to carry out the pack house trail effectively. Authors also acknowledge the financial support by the Department of Science and Technology and National Research Foundation [grant number 98352]. We thank the Bassan packers from Tzaneen for providing the fruits and facility to carry out the experiments.

Compliance with ethical standards

Conflict of interest

Authors declare that they have no conflict of Interest.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Postharvest Technology Group, Department of Crop SciencesTshwane University of TechnologyPretoriaSouth Africa

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