Insecticidal activity of bacterial antagonist strain Pseudomonas fluorescent KU52 with biopesticide (Tacca chantrieri) on chinese kale
2011
Thowthampitak, J., Kasetsart Univ., Bangkok (Thailand). Dept. of Entomology | Prathuangwong, S., Kasetsart Univ., Bangkok (Thailand). Dept. of Plant Pathology
In this study, the previous reports of plants treated with bacterial antagonist strain Pseudomonas fluorescent KU52 exhibited severity reduction of multiple diseases, led to the question if KU52 elicited the result of protection against other insect pests. Greenhouse studies were conducted to answer the question with reduced feeding to common cutworm (Spodoptera litura) identified as an important pest of Chinese kale. Cut leaves of 30-day old kale plants grown from seed treatment and 2-foliar sprays (14 and 21_day old plants) with KU52 and biopesticide (Tacca chantrieri), compared to plants treated with synthetic insecticide (cypermetrin), were again soaked in either KU52 suspension or cypermenthrin insecticide in their separated treatments belonged for offered common cutworm feeding trials. Ten larvae per leaf per plastic box arranged in CRD [complete randomized design] were investigated under control conditions. The average number of common cutworm per plant or per leaf was significantly lower on plants treated with KU52 mixed bioproduct than on non-bacterial plants with 30% reduction (P = 0.05). After feeding for one day, insect damage remained lower on leaves treated with KU52 mixed bioproduct than non treated control with interesting to note that they were dead before the pupa stage development. The hypothesis of plant metabolites induced by bacterial antagonists or elicitation of physiological changes in plants that were toxic to most insects for support was discussed. In addition, bioproduct might support efficacy of bacterial antagonist.
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