dc.contributor.author |
Perera, A.G.W.U. |
|
dc.contributor.author |
Karunaratne, M.M.S.C. |
|
dc.contributor.author |
Chinthaka, S.D.M. |
|
dc.date.accessioned |
2017-10-26T05:23:16Z |
|
dc.date.available |
2017-10-26T05:23:16Z |
|
dc.date.issued |
2016 |
|
dc.identifier.citation |
Perera, A.G.W.U., Karunaratne, M.M.S.C., Chinthaka, S.D.M. (2016). "Bioactivity and volatile profiling of Azadirachta indica leaves for the suppression of Maize Weevil, Sitphilus zeamais (Motsch.) infestations (FP1017)", Proceedings of National Conference on Green Practices – 14th July 2016 Water's Edge, Battaramulla., p. 30 |
en_US, si_LK |
dc.identifier.uri |
http://dr.lib.sjp.ac.lk/handle/123456789/6157 |
|
dc.description.abstract |
Attached |
en_US, si_LK |
dc.description.abstract |
Neem (Azadirachta indica A. juss), is known to possess a wide range of pharmacological
properties and is thus commercially exploitable. Apart from its medicinal potential, a
considerable progress has been achieved regarding biological potential and composition of
volatile fraction of the leaves which is an ever-increasing interest to th e scientific community.
During this study, biological phenom ena and for the first tim e, volatile composition of A. indica
leaves w ere examined in the m anagem ent of Sitophilus zeamais on stored maize. Efficacy of
neem leaves was tested by admixing leaf powders with maize grains at 5 doses (3.33%, 10%,
16.67% , 23.33% , and 33.33% w /w ). Using m odified cup-bioassays, repellent effect was assessed
after an hour of weevil introduction, w hile contact and fum igation toxic potential of leaf powders
w ere evaluated at 24 hour intervals up to 10 days of weevil exposure. Volatile profile of A. indica
leaves was characterized by employing headspace-solid-phase micro extraction coupled with gas
chromatography-mass spectrom etry (HS-SPME/GC-MS). Over 60% weevil repellency was
recorded at doses above 23.33% , whereas 100% and 67% contact and fum igation mortalities
w ere observed respectively, 9 days after treatm en t at the dose of 33.33% . Four volatile
compounds w ere identified accounting for 99.98% of the total detected constituents in three
distinct chemical classes (Sesquiterpenoid, aldehyde and halogenated aliphatic hydrocarbon).
G am m a.-elem ene (54.96% ) and 2-hexenal (33.33% ) w ere the m ajor constituents of neem leaf
volatiles, followed by m ethylene chloride (6.05%) and caryophyllene (5.65% ) which are
responsible for varied biological activities observed. Odor impact of th e bioassay-guided study
clearly implies th a t A. indica leaves can be harnessed against S. zeamais infestations. |
|
dc.language.iso |
en_US |
en_US, si_LK |
dc.publisher |
Proceedings of National Conference on Green Practices – 14th July 2016 Water's Edge, Battaramulla. |
en_US, si_LK |
dc.title |
Bioactivity and volatile profiling of Azadirachta indica leaves for the suppression of Maize Weevil, Sitphilus zeamais (Motsch.) infestations (FP1017) |
en_US, si_LK |
dc.type |
Article |
en_US, si_LK |