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 82
- Downloads 0
Response of Kenaf to Early and Late Cropping Seasons in Cassava-Maize Based Intercrops
Field experiments were conducted in 2013 and 2014 to study the response of kenaf to early and late cropping seasons in relay intercropping system with cassava-maize based intercrop at Ibadan Research Farm of the Institut...
Photosynthetic Efficiency and Antioxidant Activity of Cotton under Drought Stress during Early Floral Bud Development
Aims: Identify changes in photosynthetic efficiency, pigment concentration, and enzyme activity in cotton caused by water-deficit stresses during early floral bud development; compare physiological stress responses among...
Effect of Vermiwash Obtained from Different Sources (Neem, Rice Straw and Bagasse) and Standardised Hydroponics Solution on the Growth of Colocasia esculenta (Australian Poi) in Guyana
The chief economic activity of Guyana is agriculture. In the agricultural industries, the use of fertilizers for crop cultivation has been in common practice and has affected the crop quality over the years. The use of f...
Product Quality Assessment of Clarias gariepinus Fed on Varying Dietary Levels of Azadirachta indica Leaf Meal
This feeding trial was conducted to assess the body composition and product quality of Clarias gariepinus fed dietary levels of Azadirachta Indica leaf meal (AILM). Four isonitrogenous diets of 36% crude protein were for...
Evaluation of Integrated Nutrient Management for Mandarin Orange Production in Hot Humid Region of Bangladesh
The study was aimed at boosting up the yield and profitability of mandarin orange cultivation through integrated nutrient management. The experiment consists of six treatments laid out in a randomized complete block desi...