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Senthil-Nathan, Sengottayan,Kalaivani, Kandaswamy,Choi, Man-Young,Paik, Chae-Hoon Elsevier 2009 Pesticide biochemistry and physiology Vol.95 No.2
<P><B>Abstract</B></P><P>It has been established that jasmonate and its pure derivative, Jasmonic Acid can induce the emission of volatiles similar to those induced by herbivory which fed on the plant. Although the effects of induced resistance on chewing insects have been extensively studied, relatively little is known about their potential effects on phloem-feeding insects such as brown planthoppers. We studied the pattern of within-plant preference in the brown planthopper, <I>Nilaparvata lugens</I> (Stål) (BPH) (Homoptera: Delphacidae) and its consequences for offspring performance on the host-plant <I>Oryza sativa</I> L. (Taebaegbyeo variety) regarding the role of induced resistance of rice plants to hopper feeding. The present study examined the effects of induced resistance on the feeding (food assimilation and digestion), development, egg hatchability and survival. In this study, induced resistance was activated in rice using a foliar application of synthetic jasmonic acid (JA) (low 2.5mM and high 5mM). Induced resistance significantly reduced the longevity and egg hatchability of the adult <I>N. lugens</I>, as well as the percentage of nymphs surviving to maturity (only at high dose). This study also observed <I>N. lugens</I> food utilization, in order to evaluate the potential influence of induced resistance on <I>N. lugens</I> feeding behavior. The quantity of food ingested and assimilated by <I>N. lugens</I> on JA treated rice plants was significantly affected at the high dose of JA. These results indicate that JA application induces systemic defenses in rice that have a direct negative impact on <I>N. lugens</I> survivorship. At high concentration (5mM) several abnormalities possibly related to defective moulting, were observed along with malformed eggs. These findings expand our knowledge the effects of JA-dependent defenses on phloem-feeding insects.</P>
Prabhakaran Vasantha-Srinivasan,Muthiah Chellappandian,Muthiah Chellappandian,Sengottayan Senthil-Nathan,Athirstam Ponsankar,Annamalai Thanigaivel,Sengodan Karthi,Edward-Sam Edwin,Selvaraj Selin-Rani 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.4
Fresh leaves of Piper betle Linn. (Piperales: Piperaceae) and Sphaeranthus indicus Linn. (Asterales: Asteraceae), commonly known as betel leaves and East Indian globe thistle, respectively, were harvested and steam distilled for the extraction of P. betle and S. indicus crude volatile oils (Pb-CVO and Si-CVO, respectively). LC 50 calculated on 3 rd instar larvae of dengue mosquito Aedes aegypti Linn. (Diptera: Culicidae) was 42.17 ppm for PbSi-CVO (i.e., herbal formulation based on the EOs of P. betle and S. indicus). The larval and pupal duration were significantly longer post-treatment with 100 ppm of PbSi-CVO, if compared to control. We observed that PbSi-CVO significantly altered the detoxifying enzymes GST and CYP450 compared to the expression of control. Sub-lethal concentrations of PbSi-CVO showed strong repellent properties against dengue mosquitoes, without adverse reactions on the volunteers experiencing the repellent assays. Lastly, the adulticidal activity of PbSi-CVO was studied. Overall, our study outlined that this herbal product represents a promising candidate for the development of botanical based adulticidal agents.
Edward-Sam Edwin,Prabhakaran Vasantha-Srinivasan,Athirstam Ponsankar,Annamalai Thanigaivel,Selvaraj Selin-Rani,RichardW.Mankin,Sengottayan Senthil-Nathan,Kandaswamy Kalaivani,Ramasamy Kanagaraj Murali 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.4
Trichogramma species are used worldwide as biological control agents. A particularly important application is mass-rearing and release formanagement of field-crop and warehouse insect pests. Eggs of commonly available hosts, Spodoptera litura, Corcyra cephalonica, Plutella xylostella and Helicoverpa armigera, were exposed to different temperature and nonionizing ultraviolet (UV) radiation treatments to consider whether particular combinations of treatments positively affected T. chilonis development. The treatments had different effects on three measures of parasitoid production: the rate of parasitization, adult emergence, and adult viability. At constant temperature (24, 28, 32 °C), the mean percentage of egg parasitization was greatest on treatments of S. litura eggs. However, the mean percentage of adult emergence was significantly greater from C. cephalonica eggs at 28 °C than from eggs in other treatments. The mean percentage of adult viability was found to be 83.9% from C. cephalonica eggs at 28 °C. Ultraviolet radiation treatments (3, 6, or 9 min at 254 nm) significantly increased the mean percentage parasitization over that of the non-UV treatments. Also, the mean percentage of adult parasitoid emergence and viability were greater fromC. cephalonica eggs exposed to non-ionizing UV radiation than from eggs of other hosts in all other treatments. This information can be used bymanagers of mass-rearing programs to increase the effectiveness of T. chilonis production for biological control of pest insects.
월동 끝동매미충(Nephotettix cincticeps)의 약충태별 두폭크기 및 밀도변화
강석민,백채훈,이건휘,최만영,황창연,Kang, Seok-Min,Paik, Chae-Hoon,Lee, Geon-Hwi,Choi, Man-Young,Sengottayan, Senthil-Nathan,Hwang, Chang-Yeon 한국응용곤충학회 2009 한국응용곤충학회지 Vol.48 No.2
본 연구는 월동하는 끝동매미충의 충태별 분포를 두폭측정법을 활용하여 분석하였다. 끝동매미충 1령, 2령, 3령, 4령 및 5령 약충에 대한 두폭크기는 각각 0.381, 0.502, 0.673, 0.879 및 1.128mm였으며, 변이계수는 5.3, 4.0, 3.0, 4.5 및 5.3%였다. 성장률은 2령, 3령, 4령 약충에서는 1.31${\sim}$1.34로 큰 차이가 없었지만 5령에서 1.28로 약간 감소하였다. 두폭측정값의 회귀식을 구한 결과, LogY = 1.4627+0.1192X($r^2=0.9993$)으로 고도의 유의성이 인정되었고, Dyar 공식에 의한 적합도는 98% 이상으로 매우 적합하였으며, Dyar 계수(K)는 1.316이었다. 월동하는 끝동매미충의 밀도 및 충태 변화를 조사한 결과, 2006년 1월 하순에 0.25 $m^2$ 당 195마리가 채집되어 밀도가 가장 높았고, 월동 충태 조사에서는 90% 이상이 4령 약충이었다. 3월 중순부터 5령 약충의 발생량이 증가하였고, 월동 후 첫 성충발생은 4월 상순이었다. This study was conducted to investigate specific stages and distribution of overwintering nymphs of green rice leafhopper, Nephotettix cincticeps by measuring head capsule width. The nymphal head capsule width of the 1st instar to the 5th instar was 0.381, 0.502, 0.673, 0.979 and 1.128 mm, respectively. lts coefficient variation was 5.3, 4.0, 3.0, 4.5 and 5.3%, respectively. Growth ratio of each instar was not significantly different among 2nd to 4th instars as 1.31 to 1.34, but for the 5th instar it decreased as 1.28. The logarithm of the nymphal head capsule width was regressed as a function of the stage number of insects, resulting in LogY = 1.4627 + 0.1192X ($r^2= 0.9993$). Also fitness to the Dyar's law for the nymphal head capsule width of each instar was 98% or over and the Dyar's constant (K) was 1.316. The occurrence of N. cincticeps was maximum at the end of January with 195 individuals/0.25 $m^2$. The most abundant instar in the overwintering N. cincticeps population was 4th instar accounting for over 90%. Population of the 5th instar began to increase from mid-March, and adults began to occur in early April.