EFFECT OF MEALYBUG SPECIES AS PREYS ON THE DEVELOPMENTAL TIME, FEEDING CAPACITY AND FECUNDITY OF VEDALIA BEETLE, Rodolfo cardinalis (MULSANT) (COLEOPTERA : COCCINELLIDAE) UNDER LABORATORY CONDITIONS. | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 7, Volume 31, Issue 3, March 2006, Page 1679-1687 PDF (2.18 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2006.235185 | ||||
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| Authors | ||||
| A. A. Ghanim,1; Hala A.K. El-Serafi1; Nadia E. Mohamed2 | ||||
| 1Economic Entomology Dept., Faculty of Agric., Mansoura, Universty Egypt | ||||
| 2Plant Protection Research Institute, Agricultural Research Center Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| Laboratory studies were carried out in the lnsectary of Economic Entomology Department, Faculty of Agriculture, Mansoura University, from the beginning of September, 2004 till the end of December 2005 to evaluate the effect of mealybug species as preys on the developmental time; feeding capacity and fecundity of vedalia beetle Rodolfo cardinafis (Mulsant). The obtained results showed that, the averages of the duration period of the predator larvae were 13.34 : 1.26; 15.23 1.73 and 12.23:1.95 days when reared on Pianococcus citn' (Risso): lcerya seycheliarum (Westwood) and lcerya purchasr' Mask, ell respectively. The averages of the total consumption during the larval stage were 76.93: 5.93: 53.22: 3.35 and 91.14: 5.91,of third nymphal instar individuals from the three tested mealybugs respectively. The longevity period of the predator adult female, averages 40.45: 2.93 45.62: 2.40 and 36.53: 2.65 days when fed on P. cftri ; f. seychellarum and l Purchasi, consecutively . The predator female consumed during its life span an average of 413.32: 6.39; 305.54: 3.79 and 311.92: 6.75 of third nymphal instar individuals when reared on the three tested mealybug species successively . The average total number of eggs laid by female of R. cardinalr's through its life span was significantly affected by the prey consumed by these female. The number of eggs deposited per female reached an average of 350.76: 7.53; 296.47 : 22.35 and 420.35: 3.5 by rearing on the three previously mealybug species. During the longevity period of the predator male, averages 25.73: 1.57; 30.56: 2.75 and 27.35 respectively 1.92 days, when this predator male fed on P. citri; l. seycheilarum and i purchasi. The predator male consumed during its longevity period an average of 202.22: 5.94; 162.73: 2.56 and 175.35: 3.37 of third nymphal instar individuals of the three previously mealybug species. The statistical analysis showed that, there were highly significant differences in the biological characteristics of R. cardinaiis larvae and adult when reared on P citrr'; i. seycheliarum and l. Purchasi consecutively. In conclusion, the results obtained assured R. cardinalis preferred as prey f purchasi than P. citri and l. seychellarum, because this predator has a short developmental time, a high predation efficiency and reproductive capacity when fed on l. purchasr' and this predator can be used as biological control agent against the three previously mentioned mealybug species. | ||||
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