Acta Scientific Microbiology (ASMI) (ISSN: 2581-3226)

Research Article Volume 3 Issue 4

Evaluating the Repellent Properties of Mexican Marigold (Tagetes minuta) Aqueous Extracts on Aphid Population in Rape (Brassica napus)

Nyasha Sakadzo1*, Adonia Chisvuure1 and Rumbidzai Nhara2

1Faculty of Agriculture, Zimbabwe Open University, Masvingo Regional Centre, P. O. Box 1235, Masvingo, Zimbabwe
2Faculty of Natural Sciences, Department of Soil and Plant Sciences, Great Zimbabwe University, P.O. Box 1210, Masvingo, Zimbabwe

*Corresponding Author: Nyasha Sakadzo, Faculty of Agriculture, Zimbabwe Open University, Masvingo Regional Centre, P. O. Box 1235, Masvingo, Zimbabwe.

Received: February 06, 2020; Published: March 10, 2020



  Aphids (Brevicoryne brassicae) pose a threat to production of most vegetables including rape by sap sucking and transmitting viral diseases. A trial was carried out at the Jichidza High School, Masvingo Zimbabwe (2019) to evaluate the repellent properties of Mexican marigold (Tagetes minuta) aqueous extracts on aphid population in rape (Brassica napus). The experiment was laid out as a randomised complete block design (RCBD) with four treatments (0%, 2%, 4% and 6%) concentration of Mexican marigold extracts on rape replicated five times. Application of these concentrations was done at fortnight interval from week one after planting to week six of age. Data on growth rate, aphid counts, and cumulative leaf weight was collected from week three to week six after planting. The results showed that, the effects of Mexican marigold on growth rate, aphid population and cumulative leaf weight were significantly different (p < 0.05). Using 6% concentration of Mexican marigold aqueous extracts recorded the highest growth rate, lowest aphid population and highest leaf weight as compared to all other treatments. However, results from using 2% concentration of Mexican marigold aqueous extracts were not significantly different (p > 0.05) from the use of 4% concentration of Mexican marigold aqueous extracts in rape. From the results, it can be concluded that the use of 6% concentration of Mexican marigold in rape is an effective control method for aphids. From this study, it is recommended that poor smallholder farmers can utilise the repellent properties of Mexican marigold to reduce aphid yield losses in rape.

Keywords: Repellent; Brassica napus; Tagetes minuta; Aqueous; Brevicoryne brassicae



  1. Baldwin T and Richard L. “Induced Responses to Herbivory”. University of Chicago Press (2007).
  2. Holland B., et al. “Vegetables, Herbs and Spices”. The 5th Supplement to McCance and Wordowson’s. The Composition of Foods. 4th Edition. Royal Society of Chemistry.Cambridge.UK (1991).
  3. Chadha R., et al. “Monetary policy rules asset prices and exchange rates as affected by agriculture”. American Journal of Agricultural Economics 97.2 (2003). 997-1145.
  4. Turner A and Chivinge O. Production and marketing of horticultural crops in Zimbabwe: A survey of smallholder farmers in the Mashonaland East province (1999).
  5. Pollard DG. “Plant Penetration by Feeding Aphids (Hemiptera.Aphidoidea): A Review”. Bulletin of Entomological Research 62 (1973): 631-714.
  6. Hill DS. “Brevicoryne brassicae L”. In: Agricultural Insect Pests of the Tropics and their Control. 2nd Edn.Cambridge University Press. London (1993): 154-155.
  7. Kessing JLM and Mau RFL. “Crop Knowledge Master Brevicoryne brassicae L”. Cabbage aphid (1991).
  8. Clayton E. “A Study of the Mosaic Disease of Crucifers”. Journal of Agricultural Research 40.3 1930 (2012): 263-270. 
  9. Dube B., et al. Important Vegetable Pest and Diseases in Zimbabwe-Identification and Control (1998).
  10. Sakadzo N., et al. “l Herbicidal effects of Datura stramonium (L.) Leaf extracts on Amaranthus hybridus (L.) and Tagetes (L.)”. African Journal of Agricultural Research 13.34 (2018): 1754-1760.
  11. Nhachi CFB and Kasilo OMJ. “Pesticides in Zimbabwe: Toxicity and Health Implications”. University of Zimbabwe, Harare. Zimbabwe (1996).
  12. Flint ML. “Pests and Garden and Small Farm: A Growers Guide to Using Less Pesticide”. 2nd Edition. Oakland University (1999).
  13. Hort Report. “Indian Council of Agricultural Research”. New Dehli (2001).
  14. Borror DJ., et al. “An Introduction to the Study of Insects”. 4th Edition. Holt. Rinehart and Winston. New York (1976): 852.
  15. Jackson JE, et al. “Smallholder Horticulture in Zimbabwe”. University of Zimbabwe Publications. P.O Box MP 2003. Mt Pleasant. Harare. Zimbabwe (1997).
  16. Rocky Lemus. “Forage Brassicas for Winter Grazing Systems”. Mississippi State University. USA (2009).


Citation: Nyasha Sakadzo., et al. “Evaluating the Repellent Properties of Mexican Marigold (Tagetes minuta) Aqueous Extracts on Aphid Population in Rape (Brassica napus)". Acta Scientific Microbiology 3.4 (2020): 65-70.


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