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VOL. 5, ISSUE 3 (2023)
Efficacy of certain compounds of plant extracts for controlling Spodoptera littoralis (Boisd), Spodoptera exigua (Hb) and Herpetogramma hipponalis (L.) on sweet potato plant
Authors
Walaa A Tawfik, U M Saif Eldeen, Ahmed Ramadan El-Rokh
Abstract
Chemical insecticides caused several problems
to different organisms and environment, natural control is one the solution to
reduce the use of pesticides. The effectiveness of some plant extracts was
evaluated against some pests of the order Lepidoptera, Spodoptera
littoralis (Boisd), Spodoptera exigua (Hb) and Herpetogramma
hipponalis which feed on the leaves of the sweet potato plant compared to
Agerin as biopesticide. Lantana (Lantana camara) and Rimth Saltbush (Halexylon
salicornicum) methanol extracts were used as natural insecticides. Results
obtained showed that Rimth extract was the most effective than Lantana extract
after 24 hrs with LC50 9738.0 and 10798.0 ppm under laboratory
conditions against the 2nd larval of S. littoralis and vice
versa after 72 hrs with slightly different. Meanwhile, Rimth extract (LC50
8853.0 and 5667.0 ppm) was highly toxic than Lantana extract (LC50
9994.0 and 6160.0 ppm) against S. exigua after 24 and 72 hrs,
respectively under laboratory conditions. Also, H. hipponalis affected
by Rimth extract (LC507744.0 and 5169.0 ppm) more than Lantana
extract (LC50 8342.0 and 5716.0 ppm) after 24 and 72 hrs,
respectively. On another hand, the two extracts and agerin (biopesticide) were
tested against 2nd and 4th instars of the three pests
under field conditions on sweet potato plant. The reduction% of the two
extracts on the 2nd star of the three insects was over 80% after one
days of treatment. The reduction% was increase with increasing days until 5
days of treatment (94-97%) then slightly decrease after 7 days comparing with
agerin. The reduction% incase 4th instar less than 2nd
instar in all treatments. This study revealed that Some vegetative growth parameters and the chemical compositions of
sweet potato plants have relationship with the efficacy of plant extracts
against S. littoralis, S. exigua and H. hipponalis
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Pages:83-88
How to cite this article:
Walaa A Tawfik, U M Saif Eldeen, Ahmed Ramadan El-Rokh "Efficacy of certain compounds of plant extracts for controlling <i>Spodoptera littoralis</i> (Boisd), <i>Spodoptera exigua</i> (Hb) and <i>Herpetogramma hipponalis</i> (L.) on sweet potato plant". International Journal of Agriculture and Plant Science, Vol 5, Issue 3, 2023, Pages 83-88
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