INSECTICIDAL ACTIVITY OF SOME PLANT EXTRACTS AGAINST PECTINOPHORA GOSSYPIELLA (SAUNDERS) IN RELATION TO THEIR PHENOLIC CONTENTS | ||
| Egyptian Journal of Agricultural Research | ||
| Article 14, Volume 85, Issue 1, March 2007, Pages 157-170 PDF (3.01 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.2007.211349 | ||
| Authors | ||
| ADEL S. AFIFI1; ALIA ABDEL-HAFEZ2; AMR A. MOUSTAFA1; DINA A. AHMED2 | ||
| 1Biochemistry Department, Faculty of Agriculture, Cairo University, Giza, Egypt | ||
| 2Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt | ||
| Abstract | ||
| Phenolic contents of some plant extracts (pomegranate peels, acacia pods and leaves of olive, mulberry & guava) were determined as gallic add equivalents (GAE) by reference to a standard curve (y= 52.002x-0.0328, /2= 0.9964 The amount of phenolic compounds varied widely in the aforementioned plant materials and ranged between 1.86-196.63 mg GAE/g dw. Among the tested extracts, mulberry extract contained the lowest level (1.86-19.31 mg GAE/g dw) while acacia extract contained relatively the highest one (8.96-139.76 mg GAE/g dw). Moderate phenolic levels were found in pomegranate, guava an d dive extracts. Phenolic compounds also varied according to the used solvent. The tested solvents can be arranged according to its efficacy in extracting phenols as follows: acetone > ethanol > ethyl acetate > butanol > methanol. On the other hand, the insecticidal activity of these plant extracts against Pectinophora gossyplella (Saunders) was studied. Data indicated that the tested plant extracts have an insecticidal effect against newly hatched larvae. Tested extracts differed in their efficacy against pink bollworm larvae while, mortality rates increased with the increasing of the used concentration and the period after treatment. Regarding the LCD values after 2 days of treatment, it could be arranged the efficacy of the tested extracts in a descending order as follows: pomegranate > olive > mulberry > acacia > guava. Data, however, also revealed that the efficacy of the tested plant extracts does not necessarily correlated with exists of high amounts of phenolics. | ||
| Keywords | ||
| Pectinophom gossypiella; plant extracts; pomegranate (Panics granatum); olive (0/ea europaea); mulberry (Mows sp.); acacia (Acacia sp.) and guava (Psidium gua; rava); phenolic compounds | ||
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