EFFECT OF SOME ABIOTIC FACTORS ON THE POPULATION FLUCTUATION OF SOME PESTS INFESTING OKRA PLANTS, WITH THE USING OF SOME COMPOUNDS IN THEIR CONTROLLING | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 3, Volume 2, Issue 4, April 2011, Page 407-419 PDF (390.87 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2011.86449 | ||||
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| Authors | ||||
| Neama A. Abdel Hamed1; H. S. Shaalan2; Samia A. Yasin2; Aziza M. M. Abou-Zaid2 | ||||
| 1Zoology Dept., Faculty of Science (Girls), Al-Azhar University, | ||||
| 2Plant Protection Research Institute, (ARC). Dokki, Giza.Egypt. | ||||
| Abstract | ||||
| Field experiments were conducted at Qalyubiya Governorate during two successive seasons 2009 and 2010 to study the population fluctuation of some sap-sucking pests, Bemisia tabaci (Genn), Thrips tabaci,Liriomyza trifolii (Burgess) and Tetranychus urtica Koch on Okra plants, and controlling them by using of Azadirachtin (Neemazal 5% EC), the natural oil (Clove oil, 5% EC), Plant extract Damaseia 1% DC and Vertimec 1.8% EC. Also the effect of these compounds and pests on chlorophyll of the leaves during the two successive seasons. The mean number of B. tabaci firstly occurred on May 11th and increased gradually to reach the peak at August 31st during 2009 season. While the infestation rates of T. tabaci, L. trifolii and T. urtica increased gradually and reached its peak in 14th, 3rd and 10th August in 2009 season, respectively. The weather factors (maximum, minimum, mean temperature) and plant age had significant positive effect on population of B. tabaci, T. tabaci, L. trifolii and T. urtica while the relative humidity had negative significant effect on population of B. tabaci, T. tabaci, L. trifolii and T. urticae during the two studied seasons 2009 and 2010. The percentage of explained variance of the four tested factors during the two seasons were 91.50; 94.60% for B. tabaci, 88.10; 89.90% in case of T. tabaci, 73.40; 69.20% on L. trifolii and 82.10 and 84.70% for T. urticae during the two seasons, respectively. The bioactivity of the four pesticides, the obtained results showed that Cloves oil, Damaseia and Neemazal seam to be closely similar in the order of mean reduction percentages of T. tabaci, L. trifolii and T. urticae (59.53, 59.33&60.30), (54.00, 55.90&55.10) and (76.20, 77.60&85.40, respectively) during the season 2009. On the other hand, Cloves oil caused 82.14 and 82.65 mortality of eggs and nymphal stages of whitefly followed by Damaseia (83.08&81.98) and Neemazal (75.50&73.30) during the two seasons. During 2009 season, the highest content of chlorophyll A in treated the okra leaves were obtained with using Cloves oil, Vertimec and Plant Extract Damaseia in which the leaves had significantly more chlorophyll content than in control. During 2010 seasons, the leaves sprayed with Cloves oil had the highest amount of chlorophyll content, while plants sprayed with Vertimec showed significantly lower chlorophyll content than in the control plants. | ||||
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