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The potential of endophytic fungi as bio-control agents against the cotton leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)
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The potential of endophytic fungi as bio-control agents against the cotton leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)
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Journal Article
The potential of endophytic fungi as bio-control agents against the cotton leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)
2019
Overview
Endophytes are promising bio-control agents and rich sources of secondary metabolites known for their biological activities. Two medicinal plants,
Pelargonium graveolens
and
Melia azedarach
, and two weeds,
Chenopodium album
and
Malva parviflora
, were selected to isolate endophytic fungi. Spore suspension of
Alternaria alternata
(MG786545),
Alternaria solani
(MG786543),
Curvularia lunata
(MF113056),
Nigrospora sphaerica
(MF113055), and
Stemphylium
sp. endophytes was tested for their pathogenicity to the third-instar larvae of the cotton leaf worm,
Spodoptera littoralis
(Boisd.) (Lepidoptera: Noctuidae). Two techniques were used: dipping in spore suspension and residual film assay. Secondary metabolites were extracted, and ethyl acetate extracts of
A. alternata
(MG786545),
C. lunata
(MF113056), and
N. sphaerica
(MF113055) were tested for their insecticidal activity by both techniques.
C. lunata
(MF113056) showed the most potent pathogenicity causing 60% mortality after 7 days by dipping bioassay, while
A. solani
(MG7865453) and
A. alternata
(MG786545) caused 40 and 33.3% mortality, respectively. All tested endophytes showed no effect against
S. littoralis
by residual film method.
N. sphaerica
ethyl acetate extract activated larval feeding on castor leaves causing 25% mortality by residual film at 2000 mg/l.
Publisher
Springer Berlin Heidelberg,SpringerOpen
