Ecological Interactions in the System: Entomopathogenic Bacterium
Bacillus thuringiensis — Plant Pathogenic Fungus
Rhizoctonia solani — Host Plant
Solanum tuberosum
S. A. BAKHVALOV1, V. P. TSVETKOVA1, T. V. SHPATOVA1, M. V. SHTERNSHIS1, S. D. GRISHECHKINA2
1Novosibirsk State Agrarian University, 630039, Novosibirsk, Dobrolyubova str., 160
2All-Russian Research Institute for Agricultural Microbiology, 196608, St. Petersburg, Pushkin-8, Podbelsky rd., 3
svetagrishechkinа@mail.ru
Keywords: Bacillus thuringiensis, Rhizoctonia solani, Solanum tuberosum, biological control, disease suppression, polyfunctional activity, plant growth promotion
Abstract
Mutual functionаl dependence in the three-component system ( Bacillus thuringiensis – Rhizoctonia solani – Solanum tuberosum ) was shown. Suppression of rhizoctonia disease of potato due to the treatment of tubers with entomopathogenic bacteria Bacillus thuringiensis subsp. darmstadiensis ( BtH
10) was demonstrated. In vitro inhibitory activity of BtH10 towards R.solani exceeded 80 %. Field testing was carried out on two potato cultivars of different ripeness groups in 2013–2014. The rhizoctonia disease severity in stems, stolons and new tubers decreased significantly due to BtH10 treatment. Together with biological control of R. solani , BtH10 promoted the plants’ growth, increasing germinating capacity, stem height and number. Polyfunctional activity of the BtH10 bacteria contributed to the improvement of potato productivity.
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