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Application of vetiver grass Vetiveria zizanioides: Poaceae (L.) as a trap plant for rice stem borer Chilo suppressalis: Crambidae (Walker) in the paddy fields
LU Yan-hui, ZHENG Xu-song, LU Zhong-xian
2019, 18 (4): 797-804.   DOI: 10.1016/S2095-3119(18)62088-X
Abstract295)      PDF (801KB)(223)      
Rice is an important staple food in China and it is at risk of attack by rice striped stem borer Chilo suppressalis, which occurs in most rice growing areas.  In recent years, severe C. suppressalis outbreaks have been observed in China mainly due to changes in the rice cultivation systems, wide adoption of hybrid varieties and resistance to the dominant insecticides.  Management relies primarily on chemical insecticides and resistance is an important contributing factor in these outbreaks.  As a result, food safety of agricultural produce is reduced and the ecological and environmental integrities are threatened as well.  Recently, environmentally friendly pest management measures, such as trap plants have been introduced for C. suppressalis management and this method can greatly reduce insecticide use.  Our previous results indicated that the vetiver grass (Vetiveria zizanioides) is a dead-end trap plant that can effectively attract the adult females of C. suppressalis to lay eggs on it but where larvae are unable to complete their life cycle.  This paper further explored the application of vetiver grass as a trap plant to manage C. suppressalis in the paddy fields.  This environment-friendly tool can not only reduce C. suppressalis populations, it can also increase the diversity and abundance of natural enemies that can provide better environmental conditions for rice production.
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Electrophysiological responses of the rice striped stem borer Chilo suppressalis to volatiles of the trap plant vetiver grass (Vetiveria zizanioides L.)
LU Yan-hui, LIU Kai, ZHENG Xu-song, LÜ Zhong-xian
2017, 16 (11): 2525-2533.   DOI: 10.1016/S2095-3119(17)61658-7
Abstract715)      PDF in ScienceDirect      
Vetiver grass (Vetiveria zizanioides L.) was previously found to effectively attract female adults of Chilo suppressalis (Walker), an important pest of rice.  To determine the volatile compounds involved in this attraction, electroantennography (EAG) responses to seven synthetic volatiles released from vetiver plants were examined.  Our results indicated that the responses of C. suppressalis adult antennae to the different compounds varied widely.  The compounds elicited strong EAG responses in female antennae were subsequently selected for further EAG response tests, namely, caryophyllene, β-ocimene, linalool and α-pinene.   EAG responses to a combination of these four compounds did not differ significantly from the individual compounds.  However, pair combination tests indicated that 0.01 μg μL–1 linalool and 50 μg μL–1 α-pinene, 50 μg μL–1 caryophyllene and 0.01 μg μL–1 linalool, 0.01 μg μL–1 β-ocimene and 0.01 μg μL–1 linalool, and 0.01 μg μL–1 β-ocimene and 50 μg μL–1 caryophyllene elicited significantly greater EAG responses in 3-day female moths compared to the 1-day female.  These compound combinations and the corresponding ratios are probably playing an important role in attracting female adults of C. suppressalis to the vetiver grass.  
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