Biological Effectiveness of Melia Azedarach L., Fruits Extract on Potato Tuber Moth, Phthorimaea Operculella (zeller), (Lepidoptera: Gelechiidae) under lab. Conditions

Mohammed Ibrahem, Mahmoud Seedo, Jamal Abdollah

الملخص


The bioagents effect of  Melia azedarach L. mature fruits acetonic and Ether petroleum  extracts on potato tuber moth, Phthorimaea operculella (Zelle) natural mortality rates and age structure was tested under laboratory conditions .

Results showed that acetonic extracts was more effective than Ether petroleum and there was a linear relationship between bioagents effect and concentrations .

- Apparent dying rates for larvae which fed on tuber treated with acetonic extract were 76.19 and 87.1% at 2.5 and 5% concentrations; whereas this values at the same concentrations for petroleum extract equal to 56.25 and 66.31%, respectively compared with 9.23 % for control .

- The total  fecundity ( Mx ) values were 13.25 & 11.5 and 54.25 & 51.75 egg/female at 2.5 & 5% concentrations, when larvaes were fed on tubers treated with acetonic and petroleum extracts at same concentration, respectively. on this respect the age specific survival were 9 and 13 days, respectively. for control this values were 99 eggs /female and 19 days.

- Net reproductive rate values (Ro) in F2 was 0.518 and 0.282 female / female for acetonic extract and 7.011 and 3.693 female / female for petroleum extracts at 2.5 and 5 % concentrations respectively ; it was 36.396 female / female for control .

- Generation time ( Gt ) was increased to 31.9 and 36.1 and 30.6 and 32.9 days for acetonic and petroleum extracts respectively at 2.5 and 5 % compared with 27.2 days for control.

- Population Doubling time ( Dt ), the Population of Ph. operculella had the capacity to be doubled once every 118.2 and 185.9 days when larvae were fed on tubers treated with acetonic extract at 2.5 and 5% concentrations respectively compared with 9.1 and 19.6 days for petroleum at same concentration respectively and 1.55 for control. The intrinsic rate of increase (Rm) which means ability of sum total to increase free from outside factors was decreased.


الكلمات المفتاحية


Life Tables; Plant Extracts; Phthorimaea operculella ( Zeller).

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