Chemical composition and larvicidal activity of Zanthoxylum armatum against diamondback moth, Plutella xylostella.
The diamondback moth, Plutella xylostella (L.) (Lepidoptera: Yponomeutidae) is the most serious pest of cruciferous crops grown in the world causing economic yield loss. Several synthetic insecticides have been used against P. xylostella but satisfactory control was not achieved due to development of resistance to insecticides. Therefore, the present study was carried out to screen different fractions of Zanthoxylum armatum for their insecticidal activities against second instar larvae of P. xylostella. Results indicate, all the fractions showed activity to P. xylostella. However, n-hexane fraction of Z. armatum showed maximum larvicidal activity with minimum LC50 value of 2988.6 ppm followed by ethanol (LC50 = 12779.7 ppm) and methanol fraction (LC50 = 12908.8 ppm) whereas chloroform fraction was least toxic (LC50 = 16750.6 ppm). The GC-MS analysis of n-hexane fraction of leaf extract showed maximum larvicidal activity, which may be due to two major compounds i.e. 2-undecanone (19.75%) and 2-tridecanone (11.76%).
a Natural Product Chemistry and Process Development Division , CSIR-Institute of Himalayan Bioresource Technology , Palampur, Himachal Pradesh , India.
Vishal
V
Kumar
b Entomology Laboratory, Hill Area Tea Science Division , CSIR-Institute of Himalayan Bioresource Technology , Palampur, Himachal Pradesh , India.
S G Eswara
SG
Reddy
b Entomology Laboratory, Hill Area Tea Science Division , CSIR-Institute of Himalayan Bioresource Technology , Palampur, Himachal Pradesh , India.
Urvashi
U
Chauhan
a Natural Product Chemistry and Process Development Division , CSIR-Institute of Himalayan Bioresource Technology , Palampur, Himachal Pradesh , India.
Neeraj
N
Kumar
a Natural Product Chemistry and Process Development Division , CSIR-Institute of Himalayan Bioresource Technology , Palampur, Himachal Pradesh , India.
Bikram
B
Singh
D000818:Animals; D008401:Gas Chromatography-Mass Spectrometry; D007306:Insecticides / Q000737:chemistry*; D007659:Ketones / Q000737:chemistry / Q000302:isolation & purification; D007814:Larva; D009036:Moths; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D032106:Zanthoxylum / Q000737:chemistry*
D007306:Insecticides; D007659:Ketones; D010936:Plant Extracts; C009541:2-tridecanone; C526928:undecan-2-one
Plutella xylostella; Zanthoxylum armatum; fractions; insecticidal activity