Abstract
A major study that needs to be carried out present different options alternative in the form of pesticides management. Three plants collected from locations throughout Yemen, namely Neem, indica; Sodom Apple, Calotropis procera and Africa Rue, Peganum harmala were assayed against adults’ stage of two sucking insects commonly present in Yemen environment. The brown bark aphid, Pterochloroides persicae (Cholodk) and the whitefly, Bemisia labaci (Genn.) are serious insects of some fruit and vegetable plants in Yemen. The bioassay based on exposure the adult of both insects to discs and tomato seedling, which were dipped in the plant extract. Mortalities were recorded at 24 and 48 hours aner treatment according to the LC50 values. Neem extract showed the highest insecticidal activity against P. persicae followed by Sodom Apple and Hannala extracts after 48 hr of treatment. The LC50 values were 64.94, 110.34 and 1880.89 ppm, whereas 24 hr LC50 values were 95.36, 210.70 and 1900.11 ppm, respectively. It was found that B. tabaci adult was more susceptible than P. persicae. The extract of Neem gave the highest toxicity against the adult of B. labaci followed by Sodom Apple and African Rue at 24 and 48 hr. The LC50 values were 52.48, %.86 and 155.42 ppm during the initial 24 hr exposure period, whereas 48 hr LC50 were 8.93, 12.86 and 33.42 ppm, respectively. The present study suggests that natural agents, such as these suitable plant extracts, have the advantage of efficiency, highly selective, suitable for use in programs for integrated pest management, high mammalian safety, low costs and biodegradable to non-toxic products.
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Claims 5
Claim · model-written summary
Neem extract was most toxic to P. persicae after 48 hours, with an LC50 of 64.94 ppm.
- Taxon
- tomato
Solanum lycopersicume1 - Treatment
- Neem extracte0
- Interactor
- P. persicae
_and_Camponotus_sanctus.jpg?width=60)
Pterochloroides persicaee0pest - Outcome
- insecticidal activity against P. persicaee0
- Direction
- higheste0
- Value
- 64.94e0
- Comparator
- Sodom Apple and Hannala extractse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_and_Camponotus_sanctus.jpg?width=500)
Verbatim
e0“Neem extract showed the highest insecticidal activity against P. persicae followed by Sodom Apple and Hannala extracts after 48 hr of treatment. The LC50 values were 64.94, 110.34 and 1880.89 ppm”
e1“tomato seedling”
Claim · model-written summary
Sodom Apple extract had a 48 hour aphid LC50 of 110.34 ppm.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- Sodom Applee2
- Interactor
- P. persicaePterochloroides persicaee3pest
- Outcome
- LC50 valuese0
- Value
- 110.34e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The LC50 values were 64.94, 110.34 and 1880.89 ppm”
e1“tomato seedling”
e2“Sodom Apple and Hannala extracts”
e3“insecticidal activity against P. persicae followed by Sodom Apple”
Claim · model-written summary
Hannala extract had a 48 hour aphid LC50 of 1880.89 ppm.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- Hannalae2
- Interactor
- P. persicaePterochloroides persicaee3pest
- Outcome
- LC50 valuese0
- Value
- 1880.89 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The LC50 values were 64.94, 110.34 and 1880.89 ppm”
e1“tomato seedling”
e2“Sodom Apple and Hannala extracts”
e3“insecticidal activity against P. persicae followed by Sodom Apple”
Claim · model-written summary
B. tabaci adults were more susceptible than P. persicae.
- Taxon
- tomatoSolanum lycopersicume1
- Interactor
- B. tabaci
Bemisia tabacie0pest - Outcome
- B. tabaci adult was more susceptiblee0
- Direction
- more susceptiblee0
- Comparator
- P. persicaee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was found that B. tabaci adult was more susceptible than P. persicae”
e1“tomato seedling”
Claim · model-written summary
Neem had the highest toxicity to B. labaci adults.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- extract of Neeme0
- Interactor
- B. labacie0pest
- Outcome
- toxicity against the adult of B. labacie0
- Direction
- higheste0
- Comparator
- Sodom Apple and African Ruee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extract of Neem gave the highest toxicity against the adult of B. labaci followed by Sodom Apple and African Rue at 24 and 48 hr”
e1“tomato seedling”
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