Induction of Resistance in Cocoyam (Xanthosoma sagittifolium) to Pythium myriotylum by Corm Treatments with Benzothiadiazole and its Effect on Vegetative Growth
Journal Title: Journal of Experimental Agriculture International - Year 2015, Vol 5, Issue 2
Abstract
Root rot disease of cocoyam (Xanthosoma sagittifolium) caused by Pythium myriotylum (Oomycete) is a major constraint in cocoyam production in many countries in the world. Benzothiadiazole (BTH), a systemic acquired resistance inducer, was used in two concentrations (15 and 50 mg/L) as corm soaking treatment for 24 h duration to test for its effect on root rot disease resistance and vegetative growth of cocoyam under greenhouse conditions. The fungicide Metalm 72 WP (metalaxyl + cuprous oxide) was used as standard chemical control. Corm treatment with BTH significantly reduced cocoyam root rot disease (CRRD) severity compared with the pathogen-inoculated control. This was expressed by a disease index percentage of 37 and 20 for 15 and 50 mg/L BTH respectively after 28 days post-inoculation as opposed to the control with a disease index of 60. BTH at 50 mg/L was found to be more effective than the fungicide in inducing significant levels of resistance against P. myriotylum. In the absence of the pathogen, BTH and the fungicide applied as corm soaking treatment did not significantly influence the chlorophyll content. BTH significantly reduced shoot and corm/root dry weights compared to the control and fungicide respectively. However no visible phytotoxic effect was observed. BTH was tested for possible effects on P. myriotylum in vitro. There was no inhibition of mycelial growth with 15mg/L of BTH in the growth media in comparison with the control. No remarkable antifungal activity was observed with 50 mg/L. The promising effect of BTH against CRRD indicates that this compound may be future alternatives to traditional chemicals for disease control.
Authors and Affiliations
Doungous Oumar, Bih Evelyn Akumah, Nehemie Donfagsiteli Tchinda
Keywords
Related Articles
- EP ID EP354074
- DOI 10.9734/AJEA/2015/13411
- Views 97
- Downloads 0
Effect of Transplanting Time and Rainfall on the Establishment, Growth, Development and Yield of Oil Palm in the Semi-deciduous Forest Zone of Ghana
Oil palm (Elaeis guineensis Jacq) establishment, growth and yield depend to a large extent on physical and climatic characteristics of the environment in which the palm is established. A ten (10) year researcher managed...
Effect of Integrated Nutrient Management on Yield and Yield Attributes of Sweet Corn (Zea mays L. saccharata) Under Wet Temperate Conditions of Western Himalayas (India)
A field study was carried out in Experimental Farm of Division of Agronomy, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Shalimar, Srinagar, J&K, India during kharif 2011 and 2012 to stud...
Vegetable Production Potential of Turkey
The ecological diversity in Turkey has a great role on formation agricultural systems. Turkey has been the fourth largest vegetable producer after China, India, and the United States, with 29.522.290 million tons of prod...
Changes of Photosynthetic and Antioxidant Activity of Phaseolus vulgaris to Potassium
Greenhouse experiment was conducted with two cultivars of common beans and four concentrations of potassium (1, 2, 10 and 20 millimolar –mM ) were supplied to the soil pots aiming to access variations in plant antioxidan...
Comparation of Diets Used for Larviculture of Meagre (Argyrosomus regius Asso1801)
This investigation compared the suitability of different diets for larviculture of meagre (Argyrosomus regius). For this purpose, wild fish were caught with longline and subsequently fed either a commercial diet or a mol...