OLIVE FLY, DACUS OLEAE INFESTATION AND ITS EFFECT ON SOME PHYSICAL AND CHEMICAL PROPERTIES AND ORGANOLEPTIC TEST OF OLIVE OIL | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 6, Volume 29, Issue 2, February 2004, Page 949-960 PDF (1.17 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2004.239514 | ||||
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| Authors | ||||
| Azza A. A. Abd Alia,1; Nahed M. M. Atta1; F. M. M. Eid2 | ||||
| 1Fat and Oil Dept. Food Technology Institute, Agricultural Research Center. | ||||
| 2Biological Control Research Department, Plant Protection Research Institute. | ||||
| Abstract | ||||
| The infestation percentage of olive fruit by olive (Dacus oleae ) in North Sinai was evaluated . A survey of the national enemies of Dacus oleae was conducted and the percentages of parasitism was determined. In addition, the effect of different percentages of infestation of olive fruits being, 0, 5, 10, 20 and 40% were used to study its effect on the physical and chemical properties and organoleptic test of olive oil of Picual and Manzanello varieties cultivated in ::I-Ariash only. The results are as a follows: _ Infestation by olive fly D. oleae caused decrease in oil content of olive fruits. Picual and Manzanello varieties. -The acid value, peroxide value and UV absorption at 232 and 270 nm. were increased gradually with increasing infestation percentages, while the refractive index decreased by infestation. -Infestation at 20 and 40 % showed a highest increase in acid value, peroxide value and U.V. absorption, with highest decrease in oil content. -There is no appreciable changes in moisture content as a result of infestation. -The results of organoleptic test indicated that, the olive oil of Picual and Manzanello varieties, could be used up to 10% infested fruits. | ||||
| Keywords | ||||
| Olive fruit; olive fly Dacus oieee; infestation physical and chemical properties and organoleptic test | ||||
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